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  • Articles  (16)
  • Rhizosphere  (8)
  • Rice  (8)
  • Springer  (16)
  • 1980-1984  (16)
  • 1981  (16)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (16)
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  • Articles  (16)
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Keywords
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  • Springer  (16)
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  • 1980-1984  (16)
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Topic
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (16)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of nitrogen fertilizer on N2 fixation in the paddy field measured byin situ acetylene reduction assay (1981)
    Springer
    Plant and soil 59 (1981), S. 135-139 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction assay ; Effect of N fertilizer ; N2 fixation ; Rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Unfertilized and NPK-fertilized plots in the long term fertility trial at Los Baños, Philippines were used to observe the effect of nitrogen fertilizer on heterotrophic N2-fixing activities in plow layer soil and in association with wetland rice. The activities were measured in the field byin situ acetylene reduction assays. Acetylene reduction activity of the plow layer soil in the paddy field was measured by soil cores. No appreciable difference was found-between fertilized and unfertilized plots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02183599
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of phosphorus and zinc on the growth and phosphorus, zinc, copper, iron and manganese nutrition of rice (1981)
    Springer
    Plant and soil 59 (1981), S. 415-425 
    Details
    ISSN: 1573-5036
    Keywords: Rice ; Zinc-phosphorus interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A greenhouse experiment was conducted to study the effect of phosphorus and zinc application, in three lowland alluvial rice soils (Haplustalf) on the growth of rice and the concentration of phosphorus, zinc, copper, iron and manganese in shoots and roots. The results showed that application of phosphorus and zinc significantly increased the dry matter yield of shoots, grains and roots. Application of phosphorus caused a decrease in the concentration of zinc, copper, iron and manganese both in shoots and roots. Application of zinc also similarly lowered the concentration of phosphorus, copper and iron, but increased that of manganese in shoots and roots. The decrease in the concentration of the elements in the shoots was not due to dilution effect or to the reduced rate of translocation of the elements from the roots to tops. This has been attributed more to the changes in the availability of the elements in soil resulting from the application of phosphorus and zinc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184546
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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Effect of nitrogen and zinc on the yield of submerged rice and uptake of N and Zn on unlimed and limed soils (1981)
    Springer
    Plant and soil 62 (1981), S. 183-192 
    Details
    ISSN: 1573-5036
    Keywords: Liming ; Nitrogen ; Rice ; Submerged rice ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of N and Zn on the yield of submerged rice and uptake of N and Zn was studied on limed and unlimed soils in greenhouse. Nitrogen was applied at the rate of 0,80 and 160 ppm through urea, ammonium sulphate and ammonium nitrate, Zn at 0 and 10 ppm in limed (4% CaCO3) and unlimed soils. Liming (4% CaCO3) decreased dry matter yield of rice at tillering, heading and straw and grain at maturity significantly against unlimed treatments. Ammonium sulphate gave highest yield with all applied doses followed by ammonium nitrate and urea. Zinc at 10 ppm increased dry matter and grain yield significantly over no Zn treatment in rice. The N sources gave N concentration and uptake in rice plants in decreasing order: $$Ammonium sulphate 〉 Ammonium nitrate 〉 Urea.$$ The highest N concentration was recorded with 160 ppm followed by 80 ppm N through any source and lowest in control. The application of Zn increased and liming decreased N concentration and uptake by rice at all sampling stages. Highest N concentration (2.37 to 3.92%) was observed at tillering followed at heading (0.48 to 1.05%). At maturity N in grain ranged from 0.69 to 1.13% whereas in straw from 0.24 to 0.41%. There were positive significant interactions of N(S) x N(L), N(S) and N(L) x Zn and negative interaction with lime on yield, N concentration (%) and N uptake (mg/pot). The application of N sources and levels and Zn increased Zn uptake (μg/pot), and liming decreased it. But 160 ppm N through any source decreased straw Zn concentration over 80 ppm N in absence of added Zn, however, effects on grain were not so strong particularly that of 160 ppm, when 10 ppm Zn was also added even 160 ppm N increased Zn concentration over 80 ppm significantly in both straw and grain. In this case the effect of N sources on Zn concentration was in the order: $$Ammonium sulphate 〉 Urea 〉 Ammonium nitrate.$$
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374083
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of zinc, phosphorus and nitrogen on tryptophan concentration in rice grains grown on limed and unlimed soils (1981)
    Springer
    Plant and soil 62 (1981), S. 305-308 
    Details
    ISSN: 1573-5036
    Keywords: Liming ; Nitrogen ; Phosphorus ; Rice ; Tryptophan ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects of Zn, P, N and CaCO3 on tryptophan concentration in rice grain were studied in greenhouse at Haryana Agricultural University. Zinc application upto 20 ppm increased tryptophan concentration in rice grain. Zn-EDTA gave highest increase followed by ZnSO4 and then ZnO. Liming at the rate of 4 and 8 per cent decreased tryptophan concentration significantly. Phosphorus application upto 100 ppm also decreased tryptophan significantly but Zn in combination with P increased tryptophan and overcame negative effect of P. Nitrogen application upto 120 ppm increased tryptophan concentration. There was positive interaction between Zn and N. Ammonium sulphate gave highest tryptophan followed by ammonium nitrate and then urea. The tryptophan concentration ranged between 766 ppm and 2011 ppm in paddy grain. The lowest tryptophan concentration was in the plants treated with 8 per cent lime in absence of added Zn and highest with 10 ppm Zn through Zn-EDTA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374094
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Utility of some nitrogen-fixing microorganisms in the phyllosphere of crop plants (1981)
    Springer
    Plant and soil 63 (1981), S. 465-476 
    Details
    ISSN: 1573-5036
    Keywords: Aphanothece ; Beijerinckia ; Klebsiella ; Mycobacterium ; N2-fixation ; Phyllosphere ; Rice ; Streptomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The utility of spraying some known N2-fixing microorganisms on rice leaves grown both in N-less sand culture and under field conditions was examined. The effect was compared with that of spraying a phyllosphere N2-fixing isolate of Klebsiella, KUPBR2, and application of nitrogenous fertilizers. All the growth parameters studied including dry weight and N-content were enhanced. Under field conditions number of tillers was increased by 26% withKlebsiella pneumoniae M5al and by 65% with Aphanothece. The dry weight of the plants was enhanced by 61–119%. The yield per 10 m2 was almost doubled with Aphanothece, Beijerinckia 8007,Mycobacterium flavum, K. pneumoniae M5al and KUPBR2. The increases observed withStreptomyces sp. G12 though less spectacular was significant at 1% level with respect to several growth parameters.K. pneumoniae M5al,M. flavum andStreptomyces sp. G12 exhibited nitrogenase activity both in laboratory culture and in association with rice plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370046
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  • 11
    Electronic Resource
    Electronic Resource
    Effect of water table depth and tillage methods on plant-water status and yield of rice (1981)
    Springer
    Plant and soil 59 (1981), S. 17-22 
    Details
    ISSN: 1573-5036
    Keywords: Drainage ; Drought tolerance ; Evapotranspiration ; Leaf-water potential ; Lysimeter ; Rice ; Root development ; Soil-moisture regime ; Transpiration ; Varietal response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Effects of water table depths on plant-water status, and on growth and yields of two rice varieties (TOS 78 and TOS 848) were studied in a lysimetric investigation. A field study was also conducted on a hydromorphic soil to investigate the effects of fluctuating water table on rice. The leaf-water potential of TOS 78 monitored at 1300 hours at 50% flowering stage was −17.5 and −23.0 bars for 0 and 60 cm water table depths, respectively. When grown under soil moisture stress, TOS 848 maintained higher leaf-water potential (−17.5 barvs −22.5 bar) and yielded more than TOS 78. Under hydromorphic soil conditions, no-tillage treatments yielded the same as conventionally tilled plots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02183588
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  • 12
    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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  • 13
    Electronic Resource
    Electronic Resource
    Studies on the nature of relationships between grain size, spikelet number, grain yield and spikelet filling in late duration varieties of rice (Oryza sativa L.) (1981)
    Springer
    Plant and soil 60 (1981), S. 123-130 
    Details
    ISSN: 1573-5036
    Keywords: Grain number ; Grain size ; Productivity ; Rate of grain growth ; Rice ; Spikelet filling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Studies on the nature of relationship between grain size (in terms of thousand grain weight), grain number, rate of filling and yield have been worked out with late duration (140–150 days) rice varieties. Grain number per m2, grains per panicle and yield showed a negative relationship with grain size. There was no compensatory balance between grain size and grain number within a range of thousand grain weight of 15 to 30 g. Based on the peaks in grain filling activity, the varieties were classified into four groups. There was no relationship between grain size and rate of grain filling thereby suggesting that grain filling is determined by inherent endogenous factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02377117
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  • 14
    Electronic Resource
    Electronic Resource
    Dilute hydrochloric acid as an extractant for available zinc, copper and boron in rice soils (1981)
    Springer
    Plant and soil 61 (1981), S. 297-310 
    Details
    ISSN: 1573-5036
    Keywords: Boron toxicity ; Copper and zinc deficiencies ; Critical limits ; Dilute hydrochloric acid extraction ; Flooded soils ; Rice ; Soil tests
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Because zinc deficiency is a widespread disorder of wetland rice and copper deficiency may occur with it, 0.05M HCl was compared with 0.1M HCl, EDTA and DTPA as an extractant for available zinc and copper. It was also compared with the reflux method for boron assay. Thirty-three wetland rice soils were analyzed for zinc and copper by the four methods. Rice was grown on the flooded soils, scored visually for zinc deficiency, and the plants analyzed for zinc and copper content. In the boron study, 53 soils were extracted by the reflux method and the 0.05M HCl procedure. Rice was grown on the flooded soils, scored visually for boron toxicity, and the plants analyzed for boron content. Fourteen of the 16 soils on which rice showed zinc deficiency gave 〈1.0 mg/kg Zn by the 0.05M HCl method but values far in excess of the critical limits by the other methods. The r values for available and plant zinc were: 0.05M HCl (0.88**); 0.1M HCl (0.55**); EDTA (0.43**); and DTPA (0.31ns). Twelve of the zinc-deficient soils gave〈0.1 mg/kg Cu by the 0.05M HCl method but values exceeding the critical limits by the EDTA and DTPA methods. The r values for available and plant copper were: 0.05M HCl (0.74**), 0.1M HCl (0.64**), EDTA (0.28ns), and DTPA (0.20ns). The critical limit of 1.0 mg/kg by the 0.05M HCl extraction was confirmed for zinc deficiency and a tentative value of 0.1 mg/kg for copper deficiency proposed. The 0.05M HCl method separated boron-toxic soils from non-toxic soils and gave a better correlation (r=0.91**) between available and plant boron than the reflux extraction (r=0.84**). The toxic limit by the 0.05M HCl method was provisionally set at 4 mg/kg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182011
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  • 15
    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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  • 16
    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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