Nodulation of
            <i>Acacia</i>
            Species by Fast- and Slow-Growing Tropical Strains of
            <i>Rhizobium</i>

Dreyfus, B; Dommergues, Yvon

doi:10.1128/aem.41.1.97-99.1981

Cited by 132 publications

(37 citation statements)

References 6 publications

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“…and N 2 fixation of S. sesban is consistent with other reports (Ndoye et al, 1990;Turk & Keyser, 1992;Mpepereki et al, 1996;Purwantari et al, 1996), although S. sesban also formed effective symbioses with some isolates from the other three trap legumes. This is perhaps not surprising considering that strains of Sinorhizobium terangae (de Lajudie et al, 1994) nodulate both S. sesban and Acacia spp., including A. senegal which has similar rhizobial affinity to that of L. leucocephala (Dreyfus & Dommergues, 1981;Zhang et al, 1991). On a similar note, rhizobia isolated from nodules of P. juliflora, A.…”

Section: Figmentioning

confidence: 85%

Symbiotic specificity of tropical tree rhizobia for host legumes

Bala

Giller

2001

New Phytologist

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Summary• The host range and specificity is reported of a genetically diverse group of rhizobia isolated from nodules of Calliandra calothyrsus , Gliricidia sepium , Leucaena leucocephala and Sesbania sesban .• Nodule number and nitrogen content was measured in seedlings of herbaceous and woody legume species after inoculation with rhizobial strains isolated from tropical soils, to establish symbiotic effectiveness groups for rhizobial strains and their hosts.• Specificity for nodulation and N 2 fixation varied greatly among the legumes. Symbionts of all four legumes exhibited a wide range of promiscuity and symbiotic effectiveness with isolates of S. sesban having the narrowest host range. N 2 fixation varied greatly; although some strains fixed large amounts of N 2 with more than one host, none was effective with all hosts. Rhizobial isolates of C. calothyrsus , G. sepium and L. leucocephala were able to effectively cross-nodulate each others' hosts as well as a number of other species.• The complex nature of cross-nodulation relationships between diverse rhizobial strains and legume hosts is highlighted. Host plants inoculated with effective rhizobial strains showed better nitrogen use efficiency than plants supplied solely with mineral nitrogen.

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Section: Figmentioning

confidence: 85%

Symbiotic specificity of tropical tree rhizobia for host legumes

Bala

Giller

2001

New Phytologist

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“…However, trapping from soil dilutions may not reflect the true situation in the field, considering the differences between strains in their competitiveness for nodule formation and the potential influence of the soil environment on competitive success and on the range of rhizobial genotypes sampled (Bala et al 2001;Duodu et al 2006). Indeed, previous reports on cross-inoculation tests indicated A. seyal as nonselective host for diverse rhizobial genotypes including representatives of the genera Bradyrhizobium, Ensifer, Mesorhizobium and Rhizobium (Dreyfus and Dommergues 1981;Odee et al 2002).…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic analyses of symbiotic genes and characterization of functional traits of Mesorhizobium spp. strains associated with the promiscuous species Acacia seyal Del.

Diouf

Fall

Chaintreuil

et al. 2010

Journal of Applied Microbiology

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Aims: To assess the phenotypic, symbiotic and genotypic diversity scope of Mesorhizobium spp. strains associated with Acacia seyal (Del.) isolated from different agro‐ecological zones in Senegal, and uses of susceptible microbial inoculum in a reafforestation process. Methods and Results: A polyphasic approach including phenotypic and genotypic techniques was used to study the diversity and their relationships with other biovars and species of rhizobia. The geographical origins of the strains have limited effect on their phylogenetic and phenotypic classification. Nodulation tests indicated promiscuity of the strains studied, because they were capable of nodulating six woody legume species (Acacia auriculiformis, Acacia senegal, A. seyal, Acacia tortilis ssp. raddiana, Leucaena leucocephala and Prosopis juliflora). Sequencing and phylogenetic analyses of nodA, nodC and nifH genes pointed out that in contrast to nodA gene, the phylogenies of nodC and nifH genes were not consistent with that of 16S rRNA, indicating that these genes of the A. seyal‐nodulating rhizobia might have different origins. Microbial inoculation on nonsterile soil had significant effect on the nodules number and the growth of the seedlings, indicating that these strains of rhizobia might be used as inoculum. Conclusions: The results indicated that A. seyal is a nonselective host that can establish effective symbiosis with Mesorhizobium spp. strains from diverse genomic backgrounds and that the selected A. seyal‐nodulating rhizobia could enhance plant growth. Significance and Impact of the Study: These results showed the important role that A. seyal could play in the improvement of reafforestation process as a promiscuous host, which can establish effective symbiosis with rhizobia from diverse genomic backgrounds.

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“…The tree, having access to deeper soil moisture, could contribute more litter to the soil than grass alone. It is also possible that A. tortilis fixes nitrogen, thereby explaining the accumulation of that element (Dreyfus & Dommergues 1981). Pods of A. tortilis are also very high in nitrogen, and pod production may reach 7.2 kg / tree (Milton 1983).…”

Section: Discussionmentioning

confidence: 99%

Savanna tree influence on understory vegetation and soil nutrients in northwestern Kenya

Weltzin

Coughenour

1990

J Vegetation Science

223

159

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Abstract. Contrary to observations and models in which trees and herbaceous plants are viewed as competitors, we found that trees in an African savanna have positive impacts on herbaceous biomass production and composition, and on soil nutrient status. In the Turkana District of northwestern Kenya, we investigated vegetation and soil gradients along equi‐angular transects radiating from the boles of individual Acacia tortilis trees. Total herbaceous biomass averaged 260 ± 17(se) g/m2 at the bole and declined to 95 ± 8 g/m2 in the tree interspaces. Soil organic carbon and total nitrogen concentrations were greatest (0.72 % and 0.083 %, respectively) in shallow soils near the bole and declined rapidly toward the interspaces and with increasing depth. Transects were also established between tree pairs to assess effects of differential canopy proximities. Grass production averaged 220 ± 21 g / m2 below overlapping canopies, 150 ± 15 g / m2 under individual canopies, and 95 ± 8 g / m2 in interstitial areas. Detrended correspondence analysis revealed that shifts in species composition were correlated with distance from tree bole out to the edge of the canopy. Species response, in terms of relative cover, to increasing distance from the bole, seemed to fall into five general classes: 1) greatest at the bole, 2) increasing with distance from the bole, 3) greatest in the mid canopy zone, 4) least at the bole and 5) no response. Trees did not influence herbaceous compositionbeyondtree canopies. It is assumed that shade cast by the tree canopy with subsequent reductions of understory water stress and temperature and increased nutrient concentrations may be the most important factors affecting understory soil and vegetation.

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Nodulation of Acacia Species by Fast- and Slow-Growing Tropical Strains of Rhizobium

Cited by 132 publications

References 6 publications

Symbiotic specificity of tropical tree rhizobia for host legumes

Symbiotic specificity of tropical tree rhizobia for host legumes

Phylogenetic analyses of symbiotic genes and characterization of functional traits of Mesorhizobium spp. strains associated with the promiscuous species Acacia seyal Del.

Savanna tree influence on understory vegetation and soil nutrients in northwestern Kenya

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