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  • Articles  (14)
  • Rhizosphere  (8)
  • Rhizobium
  • 1980-1984  (14)
  • 1945-1949
  • 1981  (14)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (14)
Collection
  • Articles  (14)
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Keywords
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  • 1980-1984  (14)
  • 1945-1949
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Nitrate production in the rhizosphere of Plantago species (1981)
    Springer
    Plant and soil 61 (1981), S. 43-52 
    Details
    ISSN: 1573-5036
    Keywords: Adaptation ; Allelopathy ; Ecophysiology ; Grassland ; Plantago ; Nitrate production ; Nitrate reductase ; Nitrate uptake ; Nitrification ; Nitrifying bacteria ; Rhizosphere ; Root environment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The production of nitrate in an old established dune grassland soil and its uptake by plants was studied by comparing amounts of mineral nitrogen and numbers of nitrifying bacteria in the rhizosphere on the one hand, and on the other accumulated nitrate and levels of nitrate reductase (NaR) of individual plants of three Plantago species,i. e., P. major, P. lanceolata andP. coronopus. For these three Plantago species andP. media basal levels of NaR in the absence of nitrate were determined in plants grown in culture solutions. The basal NaR levels ofP. major andP. media (species occurring on nutrient-rich soils) were significantly higher than those ofP. lanceolata andP. coronopus (species found on nutrient-poor soils). NaR activity increased in the presence of nitrate and was suppressed by ammonium. From the numbers of nitrifying bacteria in the rhizosphere and NaR activity in the leaves it was concluded that nitrate was produced in the root environments of the three Plantago species and that the compound was taken up by the plants. NaR activities and numbers of nitrifying bacteria were higher for individuals ofP. major than for those ofP. lanceolata andP. coronopus. No correlation was found between the ammonium levels and the numbers of nitrifying bacteria in the soil, and no indications of inhibition of nitrifying bacteria in the rhizosphere were obtained. For individuals ofP. lanceolata a correlation was found between the numbers of nitrifying bacteria in the soil and NaR activity in the leaves. The results are discussed in relation to the ecological habitats of the three species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277361
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  • 2
    Electronic Resource
    Electronic Resource
    Natural (non-pathogenic) death of the cortex of wheat and barley seminal roots, as evidenced by nuclear staining with acridine orange (1981)
    Springer
    Plant and soil 60 (1981), S. 255-274 
    Details
    ISSN: 1573-5036
    Keywords: Acridine orange ; Barley ; Cerelas ; Microdochium bolleyi ; Nuclear staining ; Phialophora radicicola ; Rhizosphere ; Root cortex death ; Take-all ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nuclear staining with acridine orange was used to assess cell viability in the cortex of wheat and barley seminal roots from glasshouse and field experiments. Results from this method correlated well with nuclear assessments made in unstained or Feulgen-stained roots, and other evidence is presented to support the validity of the method. The pattern of root cortex death (RCD) was similar in wheat and barley and consistent over a wide range of conditions. Behind the extending root tip and zone of nucleate root hairs, nuclei disappeared progressively from the outer five (of six) cortical cell layers of the root axes, starting in the epidermis. Stainable nuclei remained in the sixth cell layer, next to the endodermis, and in most cell layers around the bases of root laterals and in a small region immediately below the grain. The onset of cell death was apparently related more to the age of a root region than to its distance behind the root tip, and it was not closely correlated with endodermal or stelar development assessed by staining with phloroglucinol/HCl. The rate of RCD was much faster in wheat than barley in both glasshouse and field conditions, and faster in some spring wheat cultivars than in others in the glasshouse. RCD occurred in sterile vermiculite and perlite and was not enhanced by the presence of soil microorganisms; nor was it enhanced in soil by the addition of the non-pathogenic fungal parasitesPhialophora radicicola var..graminicola orMicrodochium bolleyi. RCD is suggested to be endogenously controlled by the amount of photosynthate reaching the cortex. Its implications for growth of soil microorganisms and especially for growth and biological control of root-infecting fungi are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374110
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  • 3
    Electronic Resource
    Electronic Resource
    A comparison of nitrogen-fixing ability of peanut, cowpea and siratro plants nodulated by different strains of Rhizobium (1981)
    Springer
    Plant and soil 60 (1981), S. 317-319 
    Details
    ISSN: 1573-5036
    Keywords: Bacteroids ; Cowpea ; Nitrogen fixation ; Peanut ; Rhizobium ; Siratro
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Acetylene reduction activity and nitrogen accumulation in the plant top per unit nodule mass were compared among peanut, cowpea and siratro plants nodulated by six different strains of Rhizobium. Peanut was found to have several fold higher values than cowpea and siratro for both parameters for all strains of Rhizobium which nodulated it effectively, but the bacteroid content of the peanut nodules was similar to those of cowpea and siratro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374116
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  • 4
    Electronic Resource
    Electronic Resource
    Antibiotic-resistantArthrobacter sp. andPseudomonas sp. responses in the rhizosphere of blue grama after herbage removal (1981)
    Springer
    Plant and soil 62 (1981), S. 91-96 
    Details
    ISSN: 1573-5036
    Keywords: Arthrobacter ; Blue grama ; Bouteloua gracilis ; Herbage removal ; Pseudomonas ; Rhizoplane ; Rhizosphere ; Soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Streptomycin-resistant Pseudomonas and Arthrobacter were isolated from semi-arid grassland soil and their relative responses in the rhizosphere of blue grama (Bouteloua gracilis) subjected to herbage removal were evaluated. Using plants grown in normal soil, the two bacteria showed differential responses to herbage removal, which were most marked in the rhizoplane, where the Pseudomonas showed a two-log unit increase over a 60 hour period, while Arthrobacter, in contrast, exhibited a one-log unit decrease in viable counts for at least 48 hours after defoliation, responses which are similar to those observed in root exudate medium experiments by earlier workers. These results suggest that the rhizoplane may be a critical environment for interaction of these two types of microorganisms, and that sequential responses of the root-associated soil microorganisms may occur after herbage removal from this important rangeland plant. These responses are most likely associated with increased exudate release following herbage removal, which has been best documented using blue grama grown under sterile conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02205028
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  • 5
    Electronic Resource
    Electronic Resource
    Survival ofPseudomonas solanacearum in soil (1981)
    Springer
    Plant and soil 62 (1981), S. 169-182 
    Details
    ISSN: 1573-5036
    Keywords: Antagonism ; Fallow period ; Inoculum potential ; Non-host plant ; Rhizosphere ; Root exudate ; Soil amendment ; Survival ; Tomato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Studies on the survival ofPseudomonas solanacearum, the causal agent of bacterial wilt of tomato, under laboratory conditions showed that soil amendments had little effect on the population of the pathogen. When the host plant was grown in amended soil there was a positive influence on growth of the pathogen. The population level of the pathogen incorporated into the soil was reduced to one-half within a period of 46 days. The pathogen survived in the rhizosphere of non-host plants belonging to the families Acanthaceae and Leguminosae even in the absence of the natural hosts, but its incidence in the rhizosphere of plants belonging to Graminae and Cyperaceae was comparatively low indicating possibilities of reducing the inoculum potential of the pathogen in tomato fields by allowing such plants to grow during fallow periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374082
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  • 6
    Electronic Resource
    Electronic Resource
    Enhanced nodulation of leguminous plant roots by mixed cultures ofAzotobacter vinelandii and rhizobium (1981)
    Springer
    Plant and soil 62 (1981), S. 399-412 
    Details
    ISSN: 1573-5036
    Keywords: Azotobacter ; Glycine max ; Nodulation ; Rhizobium ; Trifolium repens ; Vigna unguiculata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Azotobacter vinelandii strains caused the formation of increased numbers of root nodules onGlycine max, Vigna unguiculata andTrifolium repens by their respective rhizobial symbionts. Increased nodulation due to inoculation withA. vinelandii also occurred in field grownG. max. Mutant strains ofA. vinelandii unable to fix nitrogen caused nodulation increases comparable to those caused by nitrogen-fixing strains. This indicates that nitrogen fixation byA. vinelandii was not responsible for the enhanced nodulation. The effect ofA. vinelandii on nodulation was greatest when cells from the mid-exponential phase of growth were applied as inoculants. Non viable cell preparations ofAzotobacter vinelandii were also found to cause an increase in the number of root nodules formed onGlycine max Rhizobium japonicum under greenhouse conditions. The nodulation enhancement activity was influenced by the method chosen to kill theA. vinelandii cells. Heat treatment and treatment with lethal levels of streptomycin destroyed the activity, whereas the activity was unaffected by ultraviolet-light treatment of the cells. Cell-free extracts ofA. vinelandii were found to enhance nodulation. On the other hand, culture supernatants ofA. vinelandii had no effect on nodulation. A split-root experiment suggested that the agent(s) responsible for the increased nodulation was not translocatable throughout the plant. The results suggest a non-excretable protein, produced byA. vinelandii, as a possible mechanism for nodulation enhancement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374137
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  • 7
    Electronic Resource
    Electronic Resource
    A root observation chamber for replicated use in a natural plant community (1981)
    Springer
    Plant and soil 63 (1981), S. 123-129 
    Details
    ISSN: 1573-5036
    Keywords: Glass wall method ; Observation chamber ; Rhizosphere ; Root dynamics ; Savanna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A relatively small, low cost root observation chamber of steel construction has been designed for replicated use in a natural plant community. An undisturbed soil profile, suitable for detailed study can be obtained by avoiding conventional backfilling methods and despite such factors as the recognized need for teh chamber roof to be below ground level. Installation procedure emphasizes preparation of the observation face in established woody plant communities. The technique incorporates microscopic study of roots and simultaneous recording of major soil climatic factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374591
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of hexachlorocyclohexane on the nitrogenase activity of rice rhizosphere soil (1981)
    Springer
    Plant and soil 59 (1981), S. 473-477 
    Details
    ISSN: 1573-5036
    Keywords: Hexachloroxyclohexane ; Nitrogenase activity ; Nitrogen fixation ; Redox potential ; Rhizosphere ; Rice plant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The influence of application of hexachlorocyclohexane (HCH=gamma BHC), to a submerged tropical field soil at rates equivalent to recommended field rates (1–2.5kg a.i./ha) and twice this level, upon the rhizosphere soil nitrogenase, nitrogen fixers, and soil redox potential (Eh) was investigated. The rhizosphere soil from HCH-treated field exhibited significantly higher nitrogenase activity than that from untreated fields. HCH retarded the drop in redox potential of the field soil upto 80 days after transplantation under submerged conditions. Populations of nitrogen-fixingAzospirillum sp. and Azotobacter, to a greater extent, and anaerobic organisms, to a lesser extent, were stimulated in HCH-treated soils. Results indicate the stimulation of heterotrophic nitrogen-fixing bacteria by HCH in submerged paddy soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184551
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of plant nutrient supply on nodule effectiveness and rhizobium strain competition for nodulation ofLotus pedunculatus (1981)
    Springer
    Plant and soil 60 (1981), S. 325-339 
    Details
    ISSN: 1573-5036
    Keywords: Nutrient supply ; Nodule effectiveness ; Rhizobium competition ; Nodulation ; Lotus pedunculatus ; Lotus ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of nutrient supply on nodule formation and competition between Rhizobium strains for nodulation ofLotus pedunculatus was studied. Limiting plant growth by decreasing the supply of nutrients in an otherwise nitrogen-free medium, increased the size but decreased the number and the nitrogenase activity of nodules formed by a fast-growing strain of Lotus Rhizobium (NZP2037). In contrast decreasing nutrient supply caused only a small decline in the size, number and nitrogenase activity of nodules formed by a slow-growing strain (CC814s). Providing small quantities of NH4NO3 (50 to 250 μg N) to plants grown with a normal supply of other nutrients stimulated nodule development by both Rhizobium strains and increased the nitrogenase activity of the NZP2037 nodules. Differences in the level of effectiveness (nitrogen-fixing ability) of nodules formed by different Rhizobium strains on plants grown with a normal supply of nutrients were less apparent when the plants were grown with decreased nutrient supply or when the plants were supplied with low levels of inorganic N. Inter-strain competition for nodulation ofL. pedunculatus between the highly effective slow-growing strain CC814s and 7 other fast- and slow-growing strains, showed CC814s to form 42 to 100% of the nodules in all associations. The greater nodulating competitiveness of strain CC814s prevailed despite changes in the nutrient supply to the host plant. A tendency was observed for partially effective Lotus Rhizobium strains to become more competitive in nodule formation when plant growth was supplemented with low levels of inorganic nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149629
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  • 10
    Electronic Resource
    Electronic Resource
    Phyllosphere and rhizosphere microflora of pearl millet with reference to downy mildew incited bySclerospora graminicola (Sacc.) Schroet (1981)
    Springer
    Plant and soil 62 (1981), S. 65-80 
    Details
    ISSN: 1573-5036
    Keywords: Downy mildew ; Microflora ; Phyllosphere ; Rhizosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Analysis of phyllosphere microflora showed that in the resistant cultivar (PHB-14) there was a significantly higher population of fungi, gram positive and gram negative bacteria, compared to susceptible cultivar (NHB-3) under healthy and diseased situations. The cultivars during earhead stage supported maximum phyllosphere fungal and gram negative bacterial populations. The rhizosphere of the susceptible cultivar under downy mildew influence supported maximum fungal and gram negative bacterial populations and the rhizosphere effect was the highest in downy mildew colonized susceptible NHB-3 at the earhead stage (95 days after planting). Among the fungi isolated Cladosporium dominated the phyllosphere of resistant, susceptible and susceptible cultivar under the influence of downy mildew. Among the rhizosphere microflora the population ofAspergillus sp. was found to be greatest in resistant, susceptible and the susceptible cultivar under the influence of downy mildew.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02205026
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  • 11
    Electronic Resource
    Electronic Resource
    The isolation of effective and ineffective mutants of cowpea rhizobium (1981)
    Springer
    Plant and soil 60 (1981), S. 349-356 
    Details
    ISSN: 1573-5036
    Keywords: Competition ; Cowpea ; Ineffective ; Mutagenesis ; Mutants ; Nodulation ; Rhizobium ; Symbiotic and asymbiotic nitrogen-fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A strain of cowpea Rhizobium was mutagenised and two ineffective mutants, M1 and M2, and an effective mutant, M3, were isolated. M1 produced more, but smaller nodules than the wild-type; these nodules lacked leghaemoglobin. M2 and the parental strain had similar nodulation characteristics, both forming large pink nodules. Plants inoculated with M3, nodulated earlier, produced more nodules (58%), had increased dry weights (26%) and the excised roots expressed greater acetylene (C2H2) reducing activity (39%) than plants inoculated with the wild-type. When competing with an indigenous population of effective rhizobia for nodule sites, M3 produced a higher proportion of the nodules (70–80%) than the parental strain (40–53%). M3 and the parental strain exhibited comparable rates of asymbiotic C2H2 reduction when grown on a defined medium, whereas M1 and M2 were inactive. The symbiotic properties of the mutants were unchanged after their reisolation following plant passage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149631
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  • 12
    Electronic Resource
    Electronic Resource
    Effect of soil moisture stress on legume-rhizobium symbiosis in soybeans (1981)
    Springer
    Plant and soil 60 (1981), S. 445-450 
    Details
    ISSN: 1573-5036
    Keywords: Rhizobium ; Symbiosis ; Soil moisture stress ; Soybeans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In a pot culture experiment, the influence of soil moisture stress at different physiological stages of soybean, cv. Hark, on nodulation, symbiosis and nitrogen accumulation was studied. Moisture stress reduced leghemoglobin content of root nodules and nitrogen uptake by plants. It had no effect on number of bacteroids. Stress at mid bloom and rapid pod filling stages reduced yield and seed protein content. However, these parameters were not affected by stress at nodule initiation and early flowering stages, though, flower initiation and maturity of the plant were delayed. Moisture stress at any stage did not alter nitrogen status of roots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149640
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  • 13
    Electronic Resource
    Electronic Resource
    Populations ofRhizobium japonicum associated with the surfaces of soil-grown roots (1981)
    Springer
    Plant and soil 61 (1981), S. 71-80 
    Details
    ISSN: 1573-5036
    Keywords: Ecology ; Fluorescent antibody ; Immunofluorescence ; Rhizobium japonicum ; Rhizosphere ; Root surfaces ; Soybean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Populations of nativeRhizobium japonicum 123 in the rhizospheres of field and pot grown plants as determined by immunofluorescence were calculated on the basis of root surface area. The density ofR. japonicum 123 on the root fluctuated between a few hundred to over a thousand per square centimeter of root surface. As root volume expanded rapidly, the Rhizobium density fell to less than one hundred per unit area. There was no appreciable effect due to different plant, nitrogen amendment, or addition of another strain ofR. japonicum, on the surface density of the nativeR. japonicum population on roots. Nor did the native population influence the added strain. Direct examination of root surface segments revealed that naturalized rhizobia existed sparsely on root surfaces in the form of short rods. They were observed to be attached sideways or in a polar manner on root hairs, epidermal cells, and at junctions of tap and lateral roots. There was no evidence of specific stimulation of the homologous Rhizobium by the host plant as a prelude to nodulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277364
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  • 14
    Electronic Resource
    Electronic Resource
    Gene centres, a source for genetic variants in symbiotic nitrogen fixation: Host-induced ineffectivity inPisum sativum ecotype fulvum (1981)
    Springer
    Plant and soil 61 (1981), S. 125-134 
    Details
    ISSN: 1573-5036
    Keywords: Gene centre ; Genetic variability ; Pisum sativum ecotype fulvum ; Rhizobium ; Symbiotic nitrogen fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Pisum sativum ecotype fulvum forms ineffective nodules with Rhizobium strains, isolated from effective nodules of the cultivated pea in Europe. Rhizobium strains isolated from nodules of fulvum peas in Israel are fully effective on this host plant, but in association with the cultivated pea they induce nodules of poor N2-fixing activity. The distribution of these fulvum-specific Rhizobium strains is restricted to regions where the fulvum pea occurs naturally. Rhizobium strains from other geographical regions induce mainly ineffective, or partially effective nodules on fulvum plants. A wide genetic variation, with regard to symbiotic response to a standard set of Rhizobium strains, was demonstrated in the fulvum plants collected in Israel. Based on variation in N2-fixation three groups of plants can be distinguished. These plants offer the possibility for the study of host-genetic control on symbiotic nitrogen fixation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277369
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