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Descripción
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| Rhizobia fix atmospheric nitrogen in symbiosis with legumes. This symbiotic partnership results from a molecular conversation that guarantees specificity and guides the co-development of both organisms during root nodule formation. Previous studies have suggested that, although all R. leguminosarum bv. viciae isolates can effectively nodulate all Fabeae, different Fabeae select specific genotypes of rhizobia from those available in soil. We were able to confirm the hypothesis that different plant hosts select specific subpopulations of rhizobia from the available population present in the soil. We also uncovered new insights into the determinants of legume specificity. Pea and fava bean plants strongly selected for specific genotypes, but in different ways. Pea nodules were colonized by strains endowed with a large set of genes probably implicated in rhizospheric fitness, irrespective of the symbiotic genotype they harboured. Fava bean plants restricted their selection to a specific symbiotic genotype that was not always localized in the same symbiotic plasmid, or within the same chromosomal background. No hard conclusions could be obtained for vetch, although we suggest that this plant might behave dually, either as a selective host if a given genotype results in a rhizospheric advantage, or as a non-selective host, with its nodules reflecting the genotypic diversity present in soil. This last case was the situation found for lentils; none of the three subpopulations isolated from lentil nodules (initial lentil, lentilA and lentilB) differed significantly, either among themselves, regardless of the number of plant selection cycles, or with respect to the initial soil population. | |
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Internacional
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Si |
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Nombre congreso
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Workshop New Frontiers in Plant Biology |
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Tipo de participación
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970 |
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Lugar del congreso
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Centro de Biotecnología y Genómica de Plantas |
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Revisores
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Si |
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ISBN o ISSN
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0000-0000 |
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DOI
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Fecha inicio congreso
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15/06/2016 |
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Fecha fin congreso
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17/06/2016 |
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Desde la página
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20 |
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Hasta la página
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20 |
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Título de las actas
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Genomics of specificity in the symbiotic interaction between Rhizobium leguminosarum and legumes |