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

Common beans (<i>Phaseolus vulgaris</i>) 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 <i>Rhizobium etli</i> is the predominant rhizobia found symbo...

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Detalles Bibliográficos
Autores principales: Aguilar, Orlando Mario, Riva, Omar, Peltzer Meschini, Eitel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Ciencias Exactas
nodC gene
Phaseolus vulgaris-rhizobia coevolution
Rhizobium etli lineages
Symbiotic interaction
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84327
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84327
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
nodC gene
Phaseolus vulgaris-rhizobia coevolution
Rhizobium etli lineages
Symbiotic interaction
spellingShingle Ciencias Exactas
nodC gene
Phaseolus vulgaris-rhizobia coevolution
Rhizobium etli lineages
Symbiotic interaction
Aguilar, Orlando Mario
Riva, Omar
Peltzer Meschini, Eitel
Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification
topic_facet Ciencias Exactas
nodC gene
Phaseolus vulgaris-rhizobia coevolution
Rhizobium etli lineages
Symbiotic interaction
description Common beans (<i>Phaseolus vulgaris</i>) 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 <i>Rhizobium etli</i> is the predominant rhizobia found symbolically associated with beans in the Americas. We have found polymorphism in the common nodulation gene node among <i>R. etli</i> strains from a wide range of geographical origins, which disclosed three <i>nodC</i> types. The different <i>nodC</i> 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 <i>R. etli</i> 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 <i>R. etli</i> lineages was independent of the nodulating environment. Coinoculation of wild common beans from each of the three BD centers with an equicellular mixture of <i>R. etli</i> 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 <i>R. etli</i> lineages. These results suggest coevolution in the centers of host genetic diversification.
format Articulo
Articulo
author Aguilar, Orlando Mario
Riva, Omar
Peltzer Meschini, Eitel
author_facet Aguilar, Orlando Mario
Riva, Omar
Peltzer Meschini, Eitel
author_sort Aguilar, Orlando Mario
title Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification
title_short Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification
title_full Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification
title_fullStr Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification
title_full_unstemmed Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification
title_sort analysis of rhizobium etli and of its symbiosis with wild phaseolus vulgaris supports coevolution in centers of host diversification
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/84327
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