Rhizobia in the field

Amarger, Noëlle

doi:10.1016/s0065-2113(01)73006-4

Cited by 70 publications

(38 citation statements)

References 337 publications

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“…phaseoli, Rhizobium leguminosarum bv. phaseoli, Rhizobium tropici, Rhizobium gallicum, and Rhizobium giardini (7). R. etli bv.…”

Section: T Is Generally Accepted That Phaseolus Vulgaris L (The Comentioning

confidence: 99%

“…R. etli bv. phaseoli is the predominant species found associated with both wild and cultivated common beans from Mexico, Colombia, and the southern Andes (7), leading to the proposal of coevolution between bean host and rhizobia, although this has not been fully demonstrated and remains a matter of conjecture (8,9).…”

Section: T Is Generally Accepted That Phaseolus Vulgaris L (The Comentioning

confidence: 99%

“…Thus, R. etli is found in regions where beans have been introduced since as early as the 16th century, after the discovery of the Americas. R. etli has been isolated from nodulated, cultivated beans in Spain, France, Austria, Kenya, Tunisia, and Indonesia (7,(10)(11)(12).…”

Section: T Is Generally Accepted That Phaseolus Vulgaris L (The Comentioning

confidence: 99%

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Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification

Aguilar

Riva

Peltzer

2004

Proc. Natl. Acad. Sci. U.S.A.

134

135

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Common beans (Phaseolus vulgaris) comprise three major geographic genetic pools, one in Mexico, Central America, and Colombia, another in the southern Andes, and a third in Ecuador and northern Peru. Species Rhizobium etli is the predominant rhizobia found symbiotically associated with beans in the Americas. We have found polymorphism in the common nodulation gene nodC among R. etli strains from a wide range of geographical origins, which disclosed three nodC types. The different nodC alleles in American strains show varying predominance in their regional distributions in correlation with the centers of bean genetic diversification (BD centers). By cross-inoculating wild common beans from the three BD centers with soils from Mexico, Ecuador, Bolivia, and Northwestern Argentina, the R. etli populations from nodules originated from Mexican soil again showed allele predominance that was opposite to those originated from Bolivian and Argentinean soil, whereas populations from Ecuadorian soil were intermediate. These results also indicated that the preferential nodulation of beans by geographically related R. etli lineages was independent of the nodulating environment. Coinoculation of wild common beans from each of the three BD centers with an equicellular mixture of R. etli strains representative of the Mesoamerican and southern Andean lineages revealed a host-dependent distinct competitiveness: beans from the Mesoamerican genetic pool were almost exclusively nodulated by strains from their host region, whereas nodules of beans from the southern Andes were largely occupied by the geographically cognate R. etli lineages. These results suggest coevolution in the centers of host genetic diversification.Phaseolus vulgaris-rhizobia coevolution ͉ Rhizobium etli lineages ͉ symbiotic interaction ͉ nodC gene

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“…phaseoli, Rhizobium leguminosarum bv. phaseoli, Rhizobium tropici, Rhizobium gallicum, and Rhizobium giardini (7). R. etli bv.…”

Section: T Is Generally Accepted That Phaseolus Vulgaris L (The Comentioning

confidence: 99%

Section: T Is Generally Accepted That Phaseolus Vulgaris L (The Comentioning

confidence: 99%

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Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification

Aguilar

Riva

Peltzer

2004

Proc. Natl. Acad. Sci. U.S.A.

134

135

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“…This species is native to America, where two major centers of bean genetic diversification have been proposed, one in Mesoamerica and the other in the Andean region (Velasquez and Gepts, 1994). The predominant rhizobia found to be associated with common bean in both genetic diversification centers is Rhizobium etli (Amarger, 2001). Examination of polymorphism in the R. etli nodC gene showed that strains carrying the nodC allele type-a are predominant in Mesoamerican soils, whereas those carrying the nodC allele type-d are predominant in the Andean region (Aguilar et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

A C Subunit of the Plant Nuclear Factor NF-Y Required for Rhizobial Infection and Nodule Development Affects Partner Selection in the Common Bean–Rhizobium etliSymbiosis

et al. 2010

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Legume plants are able to interact symbiotically with soil bacteria to form nitrogen-fixing root nodules. Although specific recognition between rhizobia and legume species has been extensively characterized, plant molecular determinants that govern the preferential colonization by different strains within a single rhizobium species have received little attention. We found that the C subunit of the heterotrimeric nuclear factor NF-Y from common bean (Phaseolus vulgaris) NF-YC1 plays a key role in the improved nodulation seen by more efficient strains of rhizobia. Reduction of NF-YC1 transcript levels by RNA interference (RNAi) in Agrobacterium rhizogenes-induced hairy roots leads to the arrest of nodule development and defects in the infection process with either high or low efficiency strains. Induction of three G2/M transition cell cycle genes in response to rhizobia was impaired or attenuated in NF-YC1 RNAi roots, suggesting that this transcription factor might promote nodule development by activating cortical cell divisions. Furthermore, overexpression of this gene has a positive impact on nodulation efficiency and selection of Rhizobium etli strains that are naturally less efficient and bad competitors. Our findings suggest that this transcription factor might be part of a mechanism that links nodule organogenesis with an early molecular dialogue that selectively discriminates between high-and low-quality symbiotic partners, which holds important implications for optimizing legume performance.

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“…Awareness of the benefits of cross inoculation as a means of comparing symbiotic effectiveness of wild rhizobial strains with cultivated strains has increased in the past (Amarger, 2001;Vessey, et al, 2004;Zhang, et al, 1991). The cross-inoculation of legumes of agricultural importance with rhizobial isolates from wild legumes resulted in an increase in dry matter and total nitrogen contents of cross infected plants (Iqbal and Mahmood, 1992;Lalani Wijesundra, et al, 2000;Zahran, et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Cross inoculation studies: Response of Vigna mungo to inoculation with rhizobia from tree legumes growing under arid Environment

Mahmood

Athar

2007

Int. J. Environ. Sci. Technol.

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Cross-inoculation experiments were conducted in the greenhouse to test the rhizobia isolated from nodules of seven tree legumes for their effectiveness in Vigna mungo plants. The tree legumes included Albizia lebbeck, Dalbergia sissoo, Leucaena leucocephala, Pithecellobium dulce, Prosopis cineraria, Prosopis glandulosa and Prosopis juliflora, all growing under arid environment. Rhizobia from these legumes formed nodules on the roots of Vigna mungo except isolates from Albizia lebbeck. Dry weight and nitrogen contents of Vigna mungo plants increased significantly (P<0.05) in response to cross inoculation as compared to uninoculated control. Rhizobia from Leucaena leucocephala and Prosopis glandulosa showed significant increase in dry weight (P<0.05) and nitrogen contents (P<0.05) than other inoculated treatments. The natural rhizobia of wild tree legumes growing under arid environment show higher tolerance to prevailing adverse conditions like salt stress, elevated temperatures and drought. These rhizobia may be used to inoculate wild as well as crop legumes cultivated in reclaimed desert lands. These rhizobia may have specific traits that can be transferred to other rhizobia through genetic engineering tools. The cross infection of agriculturally important legumes with isolates from wild legumes may prove a useful means of increasing nitrogen contents within these plants.

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Rhizobia in the field

Cited by 70 publications

References 337 publications

Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification

Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification

A C Subunit of the Plant Nuclear Factor NF-Y Required for Rhizobial Infection and Nodule Development Affects Partner Selection in the Common Bean–Rhizobium etliSymbiosis

Cross inoculation studies: Response of Vigna mungo to inoculation with rhizobia from tree legumes growing under arid Environment

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