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  • nitrogen fixation  (34)
  • Springer  (34)
  • National Academy of Sciences
  • Periodicals Archive Online (PAO)
  • 1995-1999
  • 1985-1989  (34)
  • 1980-1984
  • 1989  (34)
Collection
Keywords
Publisher
  • Springer  (34)
  • National Academy of Sciences
  • Periodicals Archive Online (PAO)
Years
  • 1995-1999
  • 1985-1989  (34)
  • 1980-1984
Year
  • 1
    Electronic Resource
    Electronic Resource
    Comparison of white clover and ammonium nitrate as nitrogen sources for tall fescue (1989)
    Springer
    Nutrient cycling in agroecosystems 21 (1989), S. 109-111 
    Details
    ISSN: 1573-0867
    Keywords: Legumes ; nitrogen fixation ; tall fescue ; white clover ; nitrogen fertilizer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract White clover was compared against five rates of nitrogen fertilizer (NH4NO3) as sources of N for tall fescue over a 3 year period. The white clover-tall fescue combination produced as much forage as tall fescue alone fertilized with 132–198 kg N ha−1 in the first 2 years. However, in the third year the white clover-tall fescue combination only produced as much forage as tall fescue alone fertilized with 0–66 kg N ha−1 as a result of a large decline in the stand of white clover. Tall fescue alone showed a significant response to fertilization up to the maximum rate of 264 kg N ha−1. Tall fescue fertilized with 264 kg N ha−1 produced significantly more forage than the white clover-tall fescue combination in all 3 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080535
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  • 2
    Electronic Resource
    Electronic Resource
    Juglone reduces growth, nitrogenase activity, and root respiration of actinorhizal black alder seedlings (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1823-1836 
    Details
    ISSN: 1573-1561
    Keywords: Acetylene reduction ; allelopathy ; Alnus glutinosa ; black walnut ; Frankia ; Juglans nigra ; juglone ; nitrogen fixation ; root respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract European black alder trees [Alnus glutinosa (L.) Gaertn.] fix nitrogen with nodular symbionts and are interplanted with valuable black walnut trees (Juglans nigra L.) to increase soil nitrogen fertility. However, on some soils interplanted alder can be killed by black walnut's allelochemical juglone. In order to better understand the effects of juglone directly on the growth, nitrogen fixation, and root respiration of black alder, we grew nodulated alders hydroponically in a nitrogen-free nutrient solution at juglone levels of 2 × 10−6, 2 × 10−5, and 0 molar (M). Results indicate that nitrogenase activity (acetylene reduction) of alders growing in 2 × 10−3 M juglone was reduced relative to alders without added juglone after one day, and in 2 × 10−6 M juglone after five days. Root respiration (CO2 evolution) and the relative increase of plant fresh weight were reduced in the 2 × 10−5 M juglone treatment. In a related experiment, black alder germinants were grown in Flanagan silt loam soil dosed with 10−3, 10−4, and 0 M juglone. The inhibitory effects of 10−3 M juglone on radicle elongation ceased 22–37 days after juglone treatments were started, suggesting that this soil can readily detoxify juglone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012269
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  • 3
    Electronic Resource
    Electronic Resource
    The isolation and characterization of a cDNA clone encoding Lupinus angustifolius root nodule glutamine synthetase (1989)
    Springer
    Plant molecular biology 13 (1989), S. 481-490 
    Details
    ISSN: 1573-5028
    Keywords: glutamine synthetase ; Lupinus angustifolius ; nitrogen fixation ; nodule development ; nodulin gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Glutamine synthetase, purified from Lupinus angustifolius legume nodules, was carboxymethylated and succinylated prior to chemical or enzymatic cleavage. Peptides were purified and sequenced. An oligonucleotide probe was constructed for the sequence MPGQW. This probe was used to identify a glutamine synthetase cDNA clone, pGS5, from a lupin nodule cDNA library constructed in pBR322. pGS5 was sequenced (1043 bp) and computer-assisted homology searching revealed a high degree of conservation between this lupin partial cDNA clone and other plant glutamine synthetases at both the amino acid (〉90%) and nucleotide (〉80%) level. Northern and Southern analyses using pGS5 supported the conclusion that a multigene glutamine synthetase family exists in lupin which is differentially expressed in both an organ-specific and temporal manner. Western and Northern blot analyses indicated the accumulation of a glutamine synthetase specific mRNA species during nodule development corresponded to the appearance of a novel glutamine synthetase polypeptide between 8 and 10 days after rhizobial inoculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027308
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  • 4
    Electronic Resource
    Electronic Resource
    Growth, photosynthesis, nitrogen fixation and carbohydrate production by a unicellular cyanobacterium, Synechococcus sp. (Cyanophyta) (1989)
    Springer
    Journal of applied phycology 1 (1989), S. 137-145 
    Details
    ISSN: 1573-5176
    Keywords: cyanobacterium ; Synechococcus ; carbohydrate ; nitrogen fixation ; polymer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A polymer-producing strain of unicellular cyanobacteria, Synechococcus sp., was isolated from a coastal lagoon in Florida. This strain, designated BG0011, excreted a highly viscous polysaccharide. Maximum observed growth rates for BG0011 were 2.5 div. day-2. BG0011 also exhibited nitrogen fixation (nitrogenase) activity under aerobic conditions and grew at near maximum rates in medium lacking reduced nitrogen. Growth and carbohydrate production were enhanced by carbon dioxide enrichment. Rheological study of the extracellular polysaccharide revealed a viscosity versus shear rate curve similar in shape to that of xanthan gum. Maximum observed rate of carbohydrate production was 1 g dry weight liter-1 month-1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00003876
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  • 5
    Electronic Resource
    Electronic Resource
    Study of the contribution of the shoot and/or root ofAlnus sp. in the compatibility between the host and a Sp+ Frankia strain using a grafting technique (1989)
    Springer
    Plant and soil 113 (1989), S. 101-109 
    Details
    ISSN: 1573-5036
    Keywords: Alnus ; compatibility ; Frankia ; grafting technique ; nitrogen fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two alder species,Alnus glutinosa (L.) Gaertn. andAlnus incana (L) Moench, were inoculated with a Sp+ Frankia homogenate obtained fromA. incana root nodules. This inoculum formed effective nodules on the original host plant and ineffective nodules onA. glutinosa. Grafts between the two alder species were made to determine which part of the plant is involved in this phenomenon. The results obtained indicate that the compatibility between Alnus andFrankia is restricted to the root system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181927
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of phosphorus level on VA Mycorrhizal colonization and growth of cowpea cultivars (1989)
    Springer
    Plant and soil 114 (1989), S. 45-52 
    Details
    ISSN: 1573-5036
    Keywords: cultivar variability ; Glomus fasciculatum ; growth response ; nitrogen fixation ; nutrient uptake ; rhizobium ; Vigna unguiculata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Vesicular-arbuscular mycorrhizal (VAM) associations often vary according to the abundance of available soil phosphorus (P). Therefore, understanding the response of crop plants to colonization by VAM fungi necessitates the study of the response of colonized and noncolonized plants, from a range of cultivars, to differing levels of P. Cowpea is grown throughout the world, often on impoverished soils in which it can benefit from formation of mycorrhizae. The present study was conducted to determine the response of four cultivars of cowpea (Vigna unguiculata (L.) Walp.), varying in nitrogen fixation capacity, to inoculation withGlomus fasciculatum at four levels of added P in the rooting medium. In a greenhouse experiment, four cowpea cultivars, Mississippi Silver, Brown Crowder, Six Week Browneye and MI 35, were grown with and without the mycorrhizal fungus at four levels of added P, 0, 10, 20 and 30 ppm. Root colonization (%) was negatively correlated with P content of the growth medium and shoot P concentration. Intraspecific variability was shown for shoot dry weight and leaf area in response to inoculation withG. fasciculatum at different P levels. The range of P required in the growth medium which allowed benefit fromG. fasciculatum was identified for individual cultivars using shoot dry weight and leaf area, and collectively across cultivars for other parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02203080
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of water deficit on N2(C2H2) fixation in cowpea and groundnut (1989)
    Springer
    Plant and soil 114 (1989), S. 69-74 
    Details
    ISSN: 1573-5036
    Keywords: water stress ; nitrogen fixation ; nodulation ; Vigna unguiculata ; Arachis hypogaea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of water deficit on nodulation, N2 fixation, photosynthesis, and total soluble sugars and leghemoglobin in nodules was investigated in cowpea and groundnut. Nitrogenase activity completely ceased in cowpea with a decrease in leaf water potential (ψ leaf) from −0.4 MPa to −0.9 MPa, while in groundnut it continued down to −1.7 MPa. With increasing water stress, the acetylene reduction activity (ARA) declined very sharply in cowpea, but ARA gradually decreased in groundnut. Even with mild water stress (Δψ leaf of 0.2 MPa), nodule fresh weight declined 50% in cowpea partly due to a severe nodule shedding whereas nodule fresh weight declined in groundnut only whenψ leaf decreased by 1.0 MPa. No nodule shedding was noticed even at a higher stress level in groundnut. Photosynthesis and stomatal conductance were also more stable in groundnut than in cowpea under water stress. There was a sharp increase in total soluble sugars and leghemoglobin in the nodules of groundut with water stress, but no definite trend could be found in cowpea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02203083
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  • 8
    Electronic Resource
    Electronic Resource
    Nitrogen-fixing characteristics of alfalfa cultivars nodulated by representatives of an indigenousRhizobium meliloti serogroup (1989)
    Springer
    Plant and soil 117 (1989), S. 255-262 
    Details
    ISSN: 1573-5036
    Keywords: indigenous soil rhizobia ; Medicago sativa L. ; nitrogen fixation ; regrowth cycles ; Rhizobium meliloti ; symbiotic effectiveness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Studies were conducted to evaluate whether field-grown cultivars of alfalfa (Medicago sativa L.) nodulate differentially with members of a soil population ofRhizobium meliloti, and to determine the influence of the dominant nodule occupants on N2-dependent growth of the same cultivars under greenhouse conditions. Nodules were sampled from four replicate plots of ‘Vernal’, ‘Anchor’, and ‘Saranac’ alfalfa, and the isolates analysed serologically. Results from agglutination tests identified serogroup 31 as a dominant nodule occupant. A significant cultivar effect was observed, with a greater and more consistent occupancy rate by serogroup 31 across the replicates on Vernal (60%) compared to Anchor (24%) or Saranac (36%). The symbiotic effectiveness of the parent isolate of serogroup 31 was evaluated on each cultivar over four successive harvests in a greenhouse study. Significant cultivar x N source interactions for herbage dry weight resulted following the second harvest. Of the three cultivars, only inoculated Vernal responded with an increase in shoot dry weight and N2 assimilated relative to N supplemented plants between harvests two and three. In separate greenhouse experiments, field isolates of serogroup 31 from nodules on Vernal produced homogeneous, effective responses both on Vernal and Anchor. In contrast, serogroup 31 field isolates from Anchor nodules were highly heterogeneous in effectiveness on the parent host, with poorly effective isolates being substantially more effective on Vernal. The data indicate that attention should be given to the potential impact of the indigenousR. meliloti population upon cultivar ranking at specific field locations, and also to strain-cultivar idiosyncracies when carrying out physiological sutidies of regrowth characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220719
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  • 9
    Electronic Resource
    Electronic Resource
    Response of field-grown chickpea (Cicer arietinum L.) to phosphorus fertilization for yield and nitrogen fixation (1989)
    Springer
    Plant and soil 114 (1989), S. 135-138 
    Details
    ISSN: 1573-5036
    Keywords: chickpea ; phosphorus ; nitrogen fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Application of phosphorus at 40, 60, 80 and 100 kg P2O5 ha−1 in the presence of a uniform dressing of nitrogen (N) and potash (K2O) each applied at 20 and 24 kg ha−1 to chickpea (CM-88) grown in sandy loam soil in a replicated field experiment improved the nodulation response of the crop, increased its grain yield (ka ha−1) by 18, 59, 40 and 14 percent, biomass yield (ka ha−1) by 32, 32, 54 and 14 percent, biomass N (kg ha−1) by 31, 48, 49, 19 percent, and biomass P (kg ha−1) by 26, 40, 41 and 11 percent, respectively. The effect of phosphorus on the nitrogenase activity of the excised roots of chickpea was, however, inconsistent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02203091
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  • 10
    Electronic Resource
    Electronic Resource
    A comparison of dinitrogen fixation rates in wood litter decayed by white-rot and brown-rot fungi (1989)
    Springer
    Plant and soil 115 (1989), S. 117-122 
    Details
    ISSN: 1573-5036
    Keywords: acetylene reduction ; Azospirillum ; brown-rot ; nitrogen fixation ; white-rot
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrogen fixation rates, as estimated by the acetylene reduction technique, were determined in conifer wood litter being decayed by brown- and white-rot fungi. Average ethylene production rates were significantly higher in white-rotted wood (15.1 nmol g−1 day−1) than in brown-rotted wood (2.3 nmol g−1 day−1). This difference may be related to a higher soluble sugar content in white-versus brown-rotted wood. The nitrogen-fixing bacteriumAzospirillum was not detected in any of the decaying wood samples examined. Greater nitrogen additions from nitrogen-fixing bacteria may be a factor in the more rapid white-rot decay of hardwood litter, as compared to the slower brown-rot decay of conifer wood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220701
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  • 11
    Electronic Resource
    Electronic Resource
    Nodulation and growth response ofAllocasuarina andCasuarina species to phosphorus fertilization (1989)
    Springer
    Plant and soil 118 (1989), S. 125-132 
    Details
    ISSN: 1573-5036
    Keywords: Allocasuarina sp. ; Casuarina sp. ; nitrogen fixation ; phosphorus fertilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract To examine how soil phosphorus status affects nitrogen fixation by the Casuarinaceae —Frankia symbiosis,Casuarina equisetifolia and two species ofAllocasuarina (A. torulosa andA. littoralis) inoculated or fertilized with KNO3 were grown in pots in an acid soil at 4 soil phosphate levels. InoculatedC. equisetifolia nodulated well by 12 weeks after planting and the numbers and weight of nodules increased markedly with phosphorus addition. Growth ofC. equisetifolia dependent on symbiotically fixed nitrogen was more sensitive to low levels of phosphorus (30 mg kg−1 soil) than was growth of seedings supplied with combined nitrogen; at higher levels of phosphorus, the growth response curves were similar for both nitrogen fertilized and inoculated plants. The interaction between phosphorus and nitrogen treatments (inoculated and nitrogen fertilized) demonstrated that there was a greater requirement of phosphorus for symbiotic nitrogen fixation than for plant growth when soil phosphorus was low. WithAllocasuarina species, large plant to plant variation in nodulation occurred both within pots and between replicates. This result suggests genetic variation in nodulation withinAllocasuarina species. Nodulation ofAllocasuarina species did not start until 16 weeks after planting and no growth response due toFrankia inoculation was obtained at the time of harvest. Addition of nitrogen starter is suggested to boost plant growth before the establishment of the symbiosis. Growth ofAllocasuarina species fertilized with nitrogen responded to increasing levels of phosphorus up to 90 mg P/kg soil after which it declined by 69% forA. littoralis. The decrease in shoot weight ofA. littoralis, A. torulosa, C. equisetifolia andC. cunninghamiana at high phosphorus was confirmed in a sand culture experiment, and may be atributable to phosphorus toxicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02232797
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  • 12
    Electronic Resource
    Electronic Resource
    Respiration and nitrogenase activity in nodules ofCasuarina cunninghamiana and cultures ofFrankia sp. HFP020203: Effects of temperature and partial pressure of O2 (1989)
    Springer
    Plant and soil 118 (1989), S. 111-118 
    Details
    ISSN: 1573-5036
    Keywords: actinorhizae ; Casuarina cunninghamiana ; Frankia ; nitrogen fixation ; oxygen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of time after exposure to acetylene and of nodule excision were examined using a flow-through system. After a transient depression in the rate of acetylene reduction that began about 1.5 min after exposure to acetylene, the rate recovered to 98% of the initial maximum value after 40 min. After nodule excision the rate stabilized to 90% of the initial maximum value observed in the intact plant. Excised nodules, measured at 6-min intervals in a closed system, with frequent changes of the gas mixture, were used for the remaining experiments. Acetylene reduction by the nodules increased rapidly as temperature was increased between 6 and 26°C. Between 26 and 36°C there was relatively little effect of temperature on acetylene reduction. Nodules and cultures ofFrankia were compared with respect to the effect of temperature and pO2 (partial pressure of oxygen) on oxygen uptake. Cultures ofFrankia were grown on a nitrogen-free medium at either 0.3 kPa O2 (vesicles absent) or 20 kPa O2 (vesicles present). Oxygen uptake by nodules (vesicles absent) and by vesicle-containing cultures was strongly dependent on pO2 at values below 20 kPa. This suggests the presence of a barrier to oxygen diffusion. Oxygen uptake was dependent on temperature as well as on pO2, but the Q10 was much larger for the cultures than for the nodules. This suggests that vesicles or related structures are not the source of the diffusion barrier in Casuarina nodules. Respiration by cultures ofFrankia lacking vesicles became O2-saturated at low pO2 values. Thus these cultures did not have a significant diffusion barrier. From these results it is concluded that nodules ofCasuarina cunninghamiana have a barrier to oxygen diffusion supplied by the host tissue and not byFrankia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02232795
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  • 13
    Electronic Resource
    Electronic Resource
    The response of rice to the growth and nitrogen fixation inAzolla caroliniana andAzolla pinnata at varying rates of phosphate fertilization (1989)
    Springer
    Plant and soil 114 (1989), S. 205-209 
    Details
    ISSN: 1573-5036
    Keywords: Azolla caroliniana ; Azolla pinnata ; nitrogen fixation ; Oryza sativa ; phosphate fertilizer ; rice yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The response of rice toAzolla caroliniana, newly introduced in India, was compared with the reponse to the local isolate ofAzolla pinnata at varying rates of phosphate fertilizer (4.4–8.8 kg P ha−1) during a wet and a dry season. Fresh weight, dry weight and fixed N were more for both species 21 DAI (days after inoculation) than 14 DAI, but acetylene reduction activity (ARA) was higher 14 DAI than 21 DAI. Dry weight of Azolla and fixed N were less 14 DAI forA. caroliniana than forA. pinnata during the wet season. Twenty-one DAI, fresh weight ofA. caroliniana was 62.1 and 27.6% higher than that ofA. pinnata during the wet and dry season, respectively. However, dry weight and fixed N were more 21 DAI inA. caroliniana than inA. pinnata during only the wet season. The ARA was higher inA. caroliniana both 14 and 21 DAI, irrespective of season. The presence of either species in the rice field increased grain yield, straw yield, number of panicles m−2, number of grains per panicle and reduced percentage sterility during both the wet and the dry season. Phosphate application significantly increased fresh weight, dry weight, ARA and fixed N for both species as well as grain and straw yields of rice. The responses to phosphate fertilizer were similar for both Azolla species and for rice grown with either one of the Azolla species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220799
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  • 14
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    Occurrence ofAzospirillum spp. in coconut-based farming systems (1989)
    Springer
    Plant and soil 114 (1989), S. 235-241 
    Details
    ISSN: 1573-5036
    Keywords: Azospirillum ; Cocos nucifera ; intercrops ; nitrogen fixation ; plantation crops ; tetrazolium reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Occurrence of Azospirillum was investigated in coconut-based farming systems, such as high-density multispecies cropping (15 crops), multi-storeyed cropping (3 crops), mixed cropping with tea and coffee (2 crops), intercropping with tropical tubers (5 crops), mixed farming with grasses (3 crops) and in 3 crops, arecanut,Mimosa invisa and sugarcane from other plots. A total of 26 plantation crops and intercrops were included in the study. Incidence of Azospirillum was determined by 2,3,5-triphenyl-tetrazolium chloride reduction and by culturing root fragments in N-free semisolid malate medium. Root samples from guava, mango and mimosa did not show any tetrazolium reduction or sub-surface pellicular growth. The extent of occurrence of Azospirillum seemed to depend upon the crop combinations. In a mixed farming system where guinea grass was one of the component crops, more root fragments of coconut and pepper demonstrated tetrazolium reduction activity than when guinea grass was absent.Azospirillum lipoferum andA. brasilense constituted 42% and 45% of the isolates, respectively, in the coconut-based cropping systems. Isolates from guinea grass, sugarcane and jackfruit exhibited higher nitrogenase (C2H2 reduction) than those isolated from plantation crops, tuber crops and spices. The large variation in the extent of association and nitrogenase activity of isolates from different crops indicated the need for inoculation with efficient cultures in a number of crops in coconut-based cropping systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220803
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  • 15
    Electronic Resource
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    Effect of potassium on the tolerance to PEG-induced water stress of two white clover varieties (Trifolium repens L.) (1989)
    Springer
    Plant and soil 120 (1989), S. 153-158 
    Details
    ISSN: 1573-5036
    Keywords: nitrogen fixation ; nodules ; stomatal resistance ; water potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The response to water stress was studied on white clover grown hydroponically. Two varieties (Crau and Huia) were both subjected to a moderate and a more-severe stress, induced by polyethylene glycol (10 and 20% respectively), in the presence of a nutrient solution poor in potassium (K1=0.005 mM), or abundantly supplied (K2=5mM). Dawn water potential and nitrogen fixation (acetylene reduction activity) decreased with the increasing stress. Conversely, the stomatal resistance increased whenosmoticum was added. Crau had a lower stomatal resistance to the deficit, than did Huia. In relation with the K supply, treatment K2 confirmed the superiority of Crau. Crau also showed greater nodule mass and number than Huia. The data show relationships between dawn water potential, stomatal resistance and nitrogen fixation activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02377063
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  • 16
    Electronic Resource
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    Nitrogen flows in Louisiana Gulf Coast salt marsh: Spatial considerations (1989)
    Springer
    Biogeochemistry 8 (1989), S. 25-37 
    Details
    ISSN: 1573-515X
    Keywords: nitrogen budget ; denitrification ; nitrogen fixation ; wetlands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Nitrogen flux data was synthesized in developing a nitrogen flow budget for a Louisiana Barataria BasinSpartina alterniflora salt marsh. Results demonstrate the importance of spatial consideration in developing a nitrogen budget for coastal marshes. Using a mass balance approach nitrogen inputs balanced nitrogen sinks or losses from a marsh soil-plant system with a specific rooting depth. However, per unit areas on a local scale, marshes serve as a large sink for nitrogen due to rapid accretion which removes 17.O g N m−2yr−1 through subsidence below the root zone. On a larger spatial scale (regional) it is shown that the marshes do not serve as a large nitrogen sink. The rapid marsh deterioration currently occurring in the rapidly subsiding marshes of the Mississippi River deltaic plain account for a net regional loss of 12.5 g N m−2yr−1. Thus, regionally the net sink is equivalent to only 5 g N m−2yr−1 as compared to 17.0 g N m−2yr−1 on a local scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02180165
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  • 17
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    Frankia-Alnus incana symbiosis: Effect of endophyte on nitrogen fixation and biomass production (1989)
    Springer
    Plant and soil 120 (1989), S. 291-297 
    Details
    ISSN: 1573-5036
    Keywords: acetylene reduction ; actinorhizal plants ; Alnus incana ; biomass production ; Frankia ; nitrogen fixation ; nodule type
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The efficiency of different FinnishFrankia strains as symbionts onAlnus incana (L.) Moench was evaluated in inoculation experiments by measuring nitrogen fixation and biomass production. Since all available pure cultures ofFrankia are of the Sp− type (sporangia not formed in nodules), but the dominant nodule endophyte ofA. incana in Finland is of the Sp+ type (sporangia formed in nodules), crushed nodules of thisFrankia type were included. The Sp− pure cultures, whether originating fromA. incana orA. glutinosa, produced with one exception, similar biomass withA. incana. The highest biomass was produced with an American reference strain fromA. viridis crispa. Using Sp+ nodule homogenates fromA. incana as inoculum, the biomass production was only one third of that produced by Sp− pure cultures from the same host. Hence, through selection of the endophyte it is possible to exert a considerable influence on the productivity ofAlnus incana.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02377079
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  • 18
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    Effect of nitrogen fertilization and cropping system of the reference crop on estimation of N2 fixation by vetch using15N methodology (1989)
    Springer
    Plant and soil 114 (1989), S. 227-233 
    Details
    ISSN: 1573-5036
    Keywords: legume-cereal association ; 15N ; nitrogen fixation ; nitrogen fertilization ; nitrogen transfer ; reference crop ; Vicia sativa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This study was conducted to examine the effects of varying N rates and cropping systems (mixedversus pure stand) on the suitability of oats (Avena sativa L.) for estimating N2 fixed in sequentially harvested vetch (Vicia sativa L.) over two growing seasons (1984–85 and 1985–86). The N rates were, 20 and 100 kg N ha−1 in 1984–85 and 15 and 60 kg N ha−1 in 1985–86. In the 1984–85 season, vetch at maturity derived 76 and 63% N from fixation at the high and low N rates respectively. The corresponding values for the second season were 66 and 42%. Except in the 1985–86 season when some significantly higher values of % N2 fixed were estimated by using the reference crop grown at the higher (A-value approach) than at the lower N rate (isotope-dilution approach), both approaches resulted in similar measurements of N2 fixed. In the 1984–85 season, similar values of N2 fixed were obtained using either the pure or mixed stand oats reference crops. Although in the 1985–86 season, the mixed reference crop occasionally estimated lower % N2 fixed than pure oats, total N2 fixed estimates were always similar (P〈0.05). Thus, in general, N fertilization and cropping system of the reference crop did not significantly influence estimates of N2 fixation.
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    URL: http://dx.doi.org/10.1007/BF02220802
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    Phytohormone-like substances produced by single and mixed diazotrophic cultures of Azospirillum and Arthrobacter (1989)
    Springer
    Plant and soil 115 (1989), S. 151-153 
    Details
    ISSN: 1573-5036
    Keywords: Arthrobacter ; Azospirillum ; mixed culture ; nitrogen fixation ; phytohormones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The production of phytohormone-like substances byAzospirillum brasilense andArthrobacter giacomelloi were investigated in single and mixed batch cultures under diazotrophic conditions. The mixed culture showed higher productivity of gibberellins and cytokinins.
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    URL: http://dx.doi.org/10.1007/BF02220706
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    Partitioning of biologically fixed nitrogen in cowpea during pod development (1989)
    Springer
    Plant and soil 116 (1989), S. 129-131 
    Details
    ISSN: 1573-5036
    Keywords: 15N ; nitrogen fixation ; nitrogen partitioning ; translocationVigna unguiculata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two days after exposure of roots to15N labeled N2, partitioning of biologically fixed N into leaves, stems, peduncles, pods, roots and nodules was measured in the early pod development stage of cowpea (Vigna unguiculata (L.). The experimental objective was to determine the quantity of biologically fixed N that is incorporated into vegetative tissue before being mobilized to pods. For the three varieties of cowpea included in the experiment a maximum of 50% of the N, biologically fixed two days earlier, was contained in the pods. The remaining N was distributed throughout the vegetative portion of the plant with at least 30% in stems and leaves which indicates that much of the newly fixed N must cycle through a N pool in these tissues before reaching the pods.
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    URL: http://dx.doi.org/10.1007/BF02327269
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    Cultivar and pH effects on competition for nodule sites between isolates of Rhizobium in beans (1989)
    Springer
    Plant and soil 117 (1989), S. 195-200 
    Details
    ISSN: 1573-5036
    Keywords: acidity ; nitrogen fixation ; nodulation ; nodule occupancy ; Phaseolus vulgaris ; Rhizobium leguminosarum bvphaseoli ; strain competition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two experiments were carried out to evaluate the effect of acidity on bean-Rhizobium competition for nodule sites. SevenPhaseolus vulgaris host cultivars differing in acid-pH tolerance were grown in sand culture, and irrigated using a sub-irrigation system and nutrient solutions of pH 4.5, 5.0, 5.5, and 6.0. A mixed inoculant of two antibiotically markedRhizobium leguminosarum bvphaseoli strains CIAT899 (acid-tolerant) and CIAT632 (acid-sensitive) was used. The acid-tolerant CIAT899 dominated CIAT632 in nodule occupancy across all cultivars and pH treatments. Although several of the varieties had previously been identified as PH-tolerant, and these cultivars performed better than those reported to be acid sensitive, all showed a marked increase in nodulation and plant development when the pH was raised from 4.5 to 6.0. The second experiment using a modified Leonard jar system varied the inoculation ratio between CIAT899 and UMR1116 (acid-sensitive, inefficient in N2-fixation) and contrasted nodulation response for the bean varieties ‘Preto 143’ (pH-tolerant) and ‘Negro Argel’ (pH-sensitive) at 3 pH treatments (4.5, 5.5, 6.5). There was a significant effect of host cultivar, ratio of inoculation, and pH on the percentage of nodule occupancy by each strain. At low pH CIAT899 had higher nodule occupancy than UM1116 in the variety ‘Negro Argel’ but had the same percentage of nodulation when the variety was ‘Preto 143’. Increasing the cell concentration of UMR1116 produced more inefficient nodules at all treatment combinations and reduced plant growth for both cultivars used.
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    URL: http://dx.doi.org/10.1007/BF02220712
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    Nitrogen fixation of field-inoculatedLeucaena leucocephala (Lam.) de Wit estimated by the15N and the difference methods (1989)
    Springer
    Plant and soil 117 (1989), S. 269-274 
    Details
    ISSN: 1573-5036
    Keywords: difference method ; isotope dilution ; Leucaena leucocephala ; nitrogen fixation ; Rhizobium inoculation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The amount of nitrogen fixed byLeucaena leucocephala (Lam.) de Wit was assessed on an Alfisol at the International Institute of Tropical Agriculture located in southwestern Nigeria. Estimated by the difference method, nitrogen fixation of leucaena inoculated with Rhizobium strain IRc 1045 was 133 kg ha−1 in six months. Inoculation with Rhizobium strain IRc 1050 gave a lower nitrogen fixation of 76 kg ha−1. Fertilization with 40 and 80 kg N ha−1 inhibited nitrogen fixation by 43–76% and 49–71%, respectively. Estimates with the15N dilution method gave nitrogen fixation of 134 kg ha−1 in six months when leucaena was inoculated with Rhizobium strain IRc 1045 and 98 kg ha−1 for leucaena inoculated with Rhizobium strain IRc 1050. This nitrogen fixation represented 34–39% of the plant nitrogen. Inoculated leucaena derived 5–6% of its nitrogen from applied fertilizer and 56–54% from soil.
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    URL: http://dx.doi.org/10.1007/BF02220721
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    Variation with soil depth, topographic position and host species in the capacity of soils from an Australian locale to nodulateCasuarina andAllocasuarina seedlings (1989)
    Springer
    Plant and soil 118 (1989), S. 1-11 
    Details
    ISSN: 1573-5036
    Keywords: actinorhizal plants ; Allocasuarina ; Casuarina ; Frankia ; nitrogen fixation ; nodules ; symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Sandy alluvial soils in a floodplain supporting a native stand ofCasuarina cunninghamiana Miq. produced about three times as many nodulated seedlings and more than twice as many nodules per nodulated seedling on roots of baitedCasuarina spp. than did clay loam red earth soils from the adjacent valley slope. Moist and well-aerated subsurficial alluvial sands had the greatest nodulation capacity of all the soils sampled. For all topographic positions, soil samples from depths greater than 20 cm promoted 76% more nodulated Casuarina seedlings than samples from the surficial 20 cm. Seedlings of three provenances ofC. cunninghamiana, together with seedlings ofC. glauca Sieb. ex Spreng.,C. cristata F. Muell ex Miq. andC. obesa Miq. developed significantly more nodules per pot and nodules per nodulated seedling in soils from this locale than seedlings of twoCasuarina equisetifolia Forst. provenances. Seedlings of two provenances ofAllocasuarina torulosa (Ait.) L. Johnson had fewer than 1% nodulated seedlings, a significantly lower level by far than that ofCasuarina seedlings.A. torulosa provenances also had significantly fewer nodulated seedlings per pot and nodules per nodulated seedling than all Casuarina hosts excepting one poorly-nodulated provenance ofC. equisetifolia. Nodulated seedlings of allCasuarina species had the capacity to fix atmospheric N2, as indicated by acetylene-reduction capability. The presence of yellow cladodes and low rates of acetylene reduction per plant forC. cristata Miq. suggest that this association was poorly effective.
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    URL: http://dx.doi.org/10.1007/BF02232785
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    Growth and acetylene reduction activity by intact plants ofAlnus incana under field conditions (1989)
    Springer
    Plant and soil 118 (1989), S. 61-73 
    Details
    ISSN: 1573-5036
    Keywords: Alnus incana ; field ; Frankia ; growth ; intact plants ; nitrogenase activity ; nitrogen fixation ; photosynthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The nitrogen-fixing grey alder,Alnus incana (L.) Moench, has a potential use in forest soil restoration and as part of energy forestry plantations. As a first step to estimate nitrogen fixation byA. incana under field conditions we performed studies on nitrogenase activity and its possible relation to abiotic factors and growth of the alders. Nitrogenase activity was measured as acetylene reduction activity (ARA) on eleven 1-year-old seedlings ofA. incana inoculated with a local source ofFrankia and planted in an experimental plot located in Umeå, northern Sweden. Each alder was planted into an open-ended cylinder which was closed with a gas tight lid around the stem base to serve as cuvette during ARA measurements. Propane served as tracer gas. ARA was measured in the middle of the day at 15 occasions during 26 June to 29 September 1987. Growth was recorded as leaf area and top shoot length at each ARA measurement until the end of August. Weather conditions were recorded for the whole growing season. Maximal ARA was recorded in late July or early August and ranged from 1.86 to 106μmol C2H4plant−1h−1. Final leaf area ranged from 0.022 to 0.124 m2. A relationship between ARA and the number of hours of sunshine during the same day was observed. ARA in relation to soil temperature increased during the study period, except for the last measurements. ARA in relation to leaf area was initially high but decreased later on. It is suggested that as leaves got older their contribution to photosynthesis per unit leaf area decreased and their potential to deliver nitrogen for retranslocation within plant increased. Both of these events would cause reduced ARA per unit leaf area. The data on ARA, growth, and abiotic factors taken together supported the view that sunshine and weather conditions affected photosynthesis and thereby delivery of assimilates to the nodules.
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    URL: http://dx.doi.org/10.1007/BF02232791
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    Temporal water stress effects on nodulation, nitrogen accumulation and growth of soybean (1989)
    Springer
    Plant and soil 120 (1989), S. 49-55 
    Details
    ISSN: 1573-5036
    Keywords: A-value ; drought ; nitrogen fixation ; water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The N accumulation and growth of regularly watered soybean (Glycine max. L.) plants were compared with those grown under various durations of drought stress varying from 14 to 47 days (D). The stresses were imposed between the V3 (three nodes) and R7 (physiological maturity) growth stages. The stress was defined as eithermild, moderate orsevere, corresponding to (i), a single drought cycle from V3 to R2 (18 D) or R5 to R7 (14 D), (ii) double cycle from V3 to R5 (33 D) or R2 to R7(29 D), and (iii) three continuous cycles from V3 to R7 (47 D), respectively. Plants were harvested at the R7 stage (76 days after planting). The A-values measured by the non-nodulated plants under all treatments were similar (P〈0.05), indicating that the available amount of soil N was not changed by drought. However, the A-values assessed by the nodulated plants (which included the N2 fixed), differed significantly among treatments. Except under the longest stress condition, all plants (in both genotypes) absorbed similar amounts of soil N, but N2 fixed in the nodulated plants differed, significantly among treatments. The regularly-watered plants derived the highest amount (68 mg plant−1) and proportion (46.1%) of N from fixation, and the water stresses resulted in significant reductions in N2 fixed. Although the growth of both nodulated and non-nodulated plants, was adversely affected by water stress, this was not as great as was the effect on N2 fixation. Nitrogen fixation was the most sensitive parameter to drought, followed by plant growth, and the least sensitive was soil N uptake.
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    A comparison of two methods and different media for isolatingFrankia from Casuarina root nodules (1989)
    Springer
    Plant and soil 120 (1989), S. 187-193 
    Details
    ISSN: 1573-5036
    Keywords: actinorhizae ; Casuarina ; Frankia ; isolation ; nitrogen fixation ; spores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Four species of Casuarina were raised in the glasshouse and inoculated with nodules collected from nine different geographical areas within Australia. Isolations ofFrankia were attempted from 10 of the Casuarina-Frankia nodule combinations using two methods, a nodule dissection and a filtration method. With both techniquesFrankia isolates were obtained from four of the 10Frankia sources. Spores were not observed in sections of nodules from the four sources from whichFrankia was isolated, whereas spores were observed in the remaining six nodule sources. For selected nodule sources a range of isolation media were tried, but no improvement in the isolation success rate was achieved. The effect of host species on ease of isolation was studied. The results obtained suggested it was theFrankia strain and not the host plant species which determined the ease of isolation from Casuarina nodules.
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    Short-term induction of alkaloid production in lupines Differences between N2-fixing and nitrogen-limited plants (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 2425-2434 
    Details
    ISSN: 1573-1561
    Keywords: Plant defense ; induced defense ; leaf damage ; quinolizidine alkaloids ; nitrogen fixation ; Lupinus succulentus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We used N2-fixing and nonfixing lupines to examine the effects of plant nutrition on short-term alkaloid production in damaged leaves. Three different treatments were used: damaged leaves from N2-fixing plants; undamaged leaves from these damaged, N2-fixing plants; and damaged leaves on nitrogen-limited, nonfixing plants. Relative to controls, alkaloids increased in concentration more quickly in the N2-fixing than in the nitrogen-limited plants. The magnitude of this increase in alkaloids was correlated with the initial alkaloid concentration. These results suggest that nitrogen-rich plants may benefit from faster and higher alkaloid induction than nitrogen-limited plants. In addition, the detailed dynamics of individual alkaloids are consistent with earlier proposals for the mechanism of lupine alkaloid induction.
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    Inoculationin vitro of wheat seedlings and wheat straw cultures withBacillus azotofixans (1989)
    Springer
    Plant and soil 113 (1989), S. 133-136 
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    ISSN: 1573-5036
    Keywords: Bacillus azotofixans ; in vitro inoculation ; nitrogen fixation ; wheat roots ; wheat straw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Bacillus azotofixans is a recently described species capable of fixing molecular nitrogen efficiently. Ecological studies performed in monoxenic wheat cultures, both in 0.7% agar and in vermiculite-sand mixture, showed that no acetylene reduction occurred and that this bacteria did not grow when supplied only with the wheat plant root exudates. However, after glucose addition to the 0.7% agar cultures, acetylene reduction ability (ARA) was detected. Comparing ARA for media with glucose both with and without plants, it was observed that the plants supply some component leading to the increase of the nitrogenase activity, since the ARA doubled in the samples containing plants. In wheat straw cultures a fast growth of the bacteria was observed in the first 24 hours after inoculation, but no acetylene reduction was detected. After glucose addition to the media with and without straw, nitrogenase activity was detected.
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    The response of white clover (Trifolium repens L.) seedlings to spring root temperatures: The relative roles of the plant and the Rhizobium bacteria (1989)
    Springer
    Plant and soil 113 (1989), S. 147-154 
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    ISSN: 1573-5036
    Keywords: Lolium perenne L. ; nitrogen fixation ; relative growth rates ; Rhizobium trifolii ; seedling growth ; spring temperatures ; Trifolium repens L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Three experiments are reported which examine the relative roles of host and Rhizobium genotypes as factors limiting clover (Trifolium repens L.) growth at low soil temperatures. In the first experiment un-nodulated clover and perennial ryegrass (Lolium perenne L.) were grown with non-limiting nitrate at root temperatures of 8, 10 and 12°C. The ryegrass had substantially better relative growth rates (RGR) than the clover with the biggest difference occurring at 8°C. Alterations in growth rate with temperature were more marked in clover than in ryegrass but the latter still produced several times more dry matter than clover at each temperature. In the subsequent experiments clover nodulated with different strains of rhizobia was grown with and without non-limiting additions of nitrate at root temperatures of 9, 12 and 15°C. Plants receiving nitrate generally produced more dry matter than those dependent upon Rhizobium for nitrogen but differences in yield between these treatments did not alter with temperature. This suggests that limitations imposed by nitrogen fixation are similar at both high and low temperatures. Indeed, there was some evidence that nitrogen limitations were rather more pronounced at the highest temperature. The first experiment clearly demonstrated that the clover genotype makes particularly poor use of nitrate at low root temperatures when compared to its common companion perennial ryegrass. It can be concluded that improvements in spring growth of clover will rest largely with alterations to the plant genotype and its ability to use combined nitrogen for growth at lower temperatures rather than with changes in rhizobia or any symbiotic characters.
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    Alfalfa N2-fixation enhances the phosphorus uptake of walnut in interplantings (1989)
    Springer
    Plant and soil 113 (1989), S. 291-293 
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    ISSN: 1573-5036
    Keywords: agroforestry ; interspecies transfer ; nitrogen ; nitrogen fixation ; nutrient cycling ; pH ; phosphorus ; rhizosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Walnut tree seedlings exhibited greater phosphorus (P) uptake from32P-labelled hydroxyapatite when interplanted with alfalfa than with other walnuts, black locust, or orchard grass. Three mechanisms are proposed as possible explanations of this enhnaced P uptake by walnut. In this study, diffusion of solubilized apatite-P to the roots of walnut at points of walnut-alfalfa root intersection is believed to be the operative mechanism. Phosphorus is solubilized due to rhizosphere acidification of alfalfa during nitrogen fixation. These results underscore the interdependence of nutrient cycles. Enhancement of the phosphorus cycle through manipulation of the nitrogen cycle has important implications for world food and fiber production.
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    Influence ofGlycine max nodulation on the persistence in soil of a genetically markedBradyrhizobium japonicum strain (1989)
    Springer
    Plant and soil 116 (1989), S. 275-277 
    Details
    ISSN: 1573-5036
    Keywords: antibiotic resistance ; ecology ; nitrogen fixation ; soybean ; symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Since competition with indigenous strains limits nodule occupancy by bacteria applied to seeds, the ecology of Bradyrhizobium inoculum strains used for soybean is of concern. A genetically marked strain,B. japonicum I-110 ARS, was directly enumerated from soil on selective medium. A clear long-term positive influence of even limitedGlycine max nodulation was shown by comparisons of population densities obtained with or without plant removal prior to nodule senescence in the first year and with an incompatible as well as a compatible soybean variety after 5 years.
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    Nitrogenase activity of blue-green algae on seasonally flooded soils in Bangladesh (1989)
    Springer
    Plant and soil 113 (1989), S. 47-52 
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    ISSN: 1573-5036
    Keywords: blue-green algae ; Cyanobacteria ; deepwater rice ; fertilizer ; nitrogen fixation ; pre-flood
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Blue-green algal communities formed an extensive cover on soils at five deepwater rice-growing locations in Bangladesh during the month before the arrival of floodwater. The principal taxa wereAnabaena, Cylindrospermum, Lyngbya, Microcoleus, Nostoc, Prophyrosiphon notarisii, Scytonema mirabile andTolypothrix byssoidea. One of two locations studied after the floodwaters had receded also had an extensive cover, mainlyScytonema mirabile. Nitrogenase activity assayed at mid-day was from one to three orders of magnitude higher per unit area of community than bare soil. Nostoc showed higher activity than Tolypothrix, whether expressed per unit area or biomass. Whole field estimates of N2 fixed by blue-green algal communities during the pre-flood period ranged from 1.0 to 10.2 kg N ha−1. Much of this is probably not recycled until floodwaters cover the fields. However N2 fixed after floodwaters have receded is probably recycled rapidly due to ploughing.
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    Gas diffusion pathway in nodules ofCasuarina cunninghamiana (1989)
    Springer
    Plant and soil 118 (1989), S. 119-123 
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    ISSN: 1573-5036
    Keywords: actinorhizal nodules ; Casuarina cunninghamiana ; Frankia ; nitrogen fixation ; oxygen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The gas diffusion pathway in nodules was traced by vacuum infiltration with India ink or aniline blue and by electron microscopy. India ink infiltration was observed in the outermost and the innermost cortex in sliced nodules, but not in intact nodules. With aniline blue infiltration, it was observed that intercellular air spaces in the outermost and the innermost cortex were connected to those in nodule roots. No air spaces were in contact with walls of infected cells, although intercellular air spaces existed in some groups of uninfected cells within the infected zone. Infiltration with either India ink or aniline blue could not be observed in the infected zone in essentially all cases. Thus it is suggested that the discontinuity of the intercellular air spaces represents a major resistance to O2 diffusion in nodules ofCasuarina cunninghamiana.
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    Symbiotic interactions between soybean and competing strains ofBradyrhizobium japonicum (1989)
    Springer
    Plant and soil 119 (1989), S. 139-145 
    Details
    ISSN: 1573-5036
    Keywords: competition studies ; Glycine max ; nitrogen fixation ; nodulation ; rhizosphere ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Selected symbiotic characteristics of fiveBradyrhizobium japonicum strains were assessed in association with ‘Ransom’ soybean plants (Glycine max [L.] Merr.). In the first of two greenhouse experiments, relative nodulation competitiveness of the strains was examined. Strains were grouped into pairs, and corresponding cells were applied to surface-disinfected seeds so as to provide seven ratios of cell numbers between the two strains. Tap root nodules were harvested 28 days after sowing and serotyped by means of an enzyme-linked immunosorbent assay. Strains differed considerably in nodulation competitiveness, and these differences were successfully quantified using relationships previously proposed in the literature. A second experiment involved assessment of the reproducibility of this technique and characterization of the symbiotic response to single- and double-strain inocula. Differences in relative nodulating abilities of strains were apparent between experiments and were possibly related to observed variations in greenhouse temperatures. Plant shoot weight and total N content were not significantly correlated with nodule number or weight when evaluated across inoculation treatments, but these correlations were often significant within inoculation treatments. Certain double-strain inocula produced either positive or negative effects on shoot weight, N content, and nodulation, when compared with values predicted from corresponding controls receiving single-strain inocula.
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    URL: http://dx.doi.org/10.1007/BF02370278
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