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  • Rhizobium  (3)
  • Rhizobium etli  (2)
  • Triticum aestivum  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Scientia Horticulturae 31 (1987), S. 1-9 
    ISSN: 0304-4238
    Keywords: Rhizobium ; mung bean ; nodulation ; persistence ; promiscuity ; tropical legumes ; winged bean
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Scientia Horticulturae 20 (1983), S. 231-240 
    ISSN: 0304-4238
    Keywords: Azospirillum ; N"2-fixation ; Rhizobium ; nodulation ; soybean ; winged bean
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0789
    Keywords: Key words Competitiveness ; Genetic exchange ; Rhizobium etli ; Rhizobium tropici IIB ; Saprophytic ; competence ; Symbiotic nitrogen fixation ; Nodule population
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Inoculation of beans (Phaseolus vulgaris L.) with strains of R. tropici IIB and R. etli resulted in the disappearance of the R. tropici IIB stains from the nodule population and their replacement by other (non R. tropici IIB) bean symbionts (Vlassak et al. 1996). Coinoculation studies in monoxenic conditions and in soil core microcosms with plants harvested at two different growth stages indicated that the inoculated R. tropici IIB strains CIAT899 and F98.5 possess a good intrinsic competitiveness which declines, however, at a later plant growth stage and in soil conditions. The poor saprophytic competence of R. tropici IIB strain CIAT899 was further demonstrated by its poor survival in soil core microcosms after bean harvest. Strains were isolated from the field plots with a 3-year bean-planting history, characterized and evaluated for their competitiveness against R. tropici IIB strain CIAT899. Isolates from field plots, which had been repeatedly inoculated with R. tropici IIB strain CIAT899, showed a higher nodule occupancy compared to R. tropici IIB strain CIAT899, and this higher competitiveness exhibited by the field isolates might be an additional reason for the poor performance of R. tropici IIB strain CIAT899 in the field study. Plots with and without a history of bean production revealed after 3-year bean cultivation an almost totally different population that also significantly differed in competitiveness.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0789
    Keywords: Azospirillum brasilense ; Triticum aestivum ; Inoculation ; N and dry matter yield ; N percentages in plant parts ; Associative N2 fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Wheat plants (Triticum aestivum) grown in pots and in the field under the Mediterranean climate of the south of France were inoculated with a strain of Azospirillum brasilense. Comparisons with non-inoculated plants grown under the same conditions showed significant responses to inoculation with an increase in the number of fertile tillers, shoot and root dry weight, and root to shoot biomass ratio. The roots of inoculated plants attracted relatively more assimilates than those of the control plants until a late stage of growth (heading stage) but the rhizosphere respiration expressed per unit of root growth was not increased by inoculation. Nitrogen yield, both total and in grains, was also enhanced; however, N percentages of all aerial parts of the plants grown in pots were always statistically lower after inoculation than in the control. At maturity, the N % in seeds was 1.81 and 2.45, respectively. The possible mechanisms of this effect of inoculation under the experimental conditions of this study are discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0789
    Keywords: Competition ; Inoculation ; N2 fixation ; Phaseolus vulgaris ; Rhizobium etli ; Rhizobium tropici ; Nodule occupancy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Strains of Rhizobium tropici IIB, CIAT899 and F98.5, both showing good N2 fixation, and a R. etli strain W16.3SB were introduced into a field which had no history of bean culture. Plant dilution estimates showed that in the presence of its host (Phaseolus vulgaris cv. Carioca) during the cropping seasons and the subsequent fallow summer periods, the bean rhizobial populations increased from less than 30 to 103 g−1 dry soil after 1 year and to 104 g−1 dry soil after 2 years. In the 1st year crop, the inoculated strains occupied most of the nodules, which resulted in a higher nodulation and C2H2 reduction activity. Without reinoculation for the second and third crops, however, little R. tropici IIB was recovered from the nodules and the bean population consisted mainly of R. etli, R. leguminosarum bv. phaseoli, and R. tropici IIA. Reinoculation with our superior R. tropici IIB strains before the second crop resulted in R. tropici IIB occupying the main part of the nodules and a positive effect on nodulation and C2H2 reduction activity, but reintroduction of the inoculant strain in the third season did not have any effect.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1617-4623
    Keywords: Key words Transcriptional regulator ; AraC ; Rhizobium ; Symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rhizobium sp. BR816 contains four nodD alleles of which nodD 3 is the most important transcriptional regulator for nodulation of Phaseolus vulgaris. Upstream of nodD 3 an open reading frame, orf816, was identified. The deduced ORF816 protein shows homology with transcriptional regulators of the AraC/XylS family. The DNA binding domain and the consensus motif, characteristic of the C-terminal region of the members of this family of transcriptional regulators, are present in the deduced ORF816 protein. Activation of nodA gene expression and nodulation of P. vulgaris by Rhizobium sp. NGR234nodD 1 :: Ω (Nod−) complemented with the Rhizobium sp. BR816 nodD 3 gene were significantly increased in the presence of orf816. This increased nodulation and nod gene induction are mediated through positive regulation of nodD 3 expression by ORF816. Expression of orf816 itself is partially RpoN dependent. The role of this transcriptional regulator in the complex cascade regulation of the Rhizobium sp. nodD 3 gene is discussed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 66 (1982), S. 217-223 
    ISSN: 1573-5036
    Keywords: Azospirillum brasilense ; Biofertilizer ; Spring-wheat ; Triticum aestivum ; Winter-wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Three field experiments were conducted on ten cultivars of winterwheat and four cultivars of springwheat to estimate the growth promoting effect ofAzospirillum brasilense under varying nitrogen doses. Independent of cultivar selection or nitrogen dose a highly significant yield increase could be observed in winterwheat: strains S631 and SpBr14 increased the average grain yield with 9.14% and 14.82% respectively. When the yield components were studied a coinciding increase in ear density could be demonstrated of resp. 10.57% and 13.55%. Less significant results were obtained with springwheat although in one experiment strain SpBr14 significantly increased grain yield. As with winterwheat tillering of the plant was markedly affected by inoculation with both strains. In a companion greenhouse experiment it was found that inoculation with Azospirillum can cause a decrease in the root mass of wheatplants except when strain SpBr14 is used. Therefore it is suggested that the presence of a higher tillering together with an undisturbed nutrient uptake capacity can result in yield increases after inoculation withAzospirillum brasilense.
    Type of Medium: Electronic Resource
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