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Descripción
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| The symbiotic nitrogen fixation in legume nodules is the final outcome of a complex interaction between plant and rhizobia. In this interaction, multiple compounds produced either by the plant macrosymbiont (flavonoids, lectins, different kinds of peptides, etc) of by the bacterial microsymbiont (Nod factors, EPS, LPS, etc) participate in a sophisticate molecular dialogue that governs the specificity of the interaction (1). In spite of the number of signals involved, the degree of specificity of the symbiosis is highly variable. In some cases, several legumes can be nodulated by the same rhizobial strain. In the case of Rhizobium leguminosarum bv. viciae, plant species belonging to four different genera (Pisum, Lens, Lathyrus, and Vicia) are permissive for the establishment of efficient nitrogen fixation in nodules. The basis for the ability of this bacterium to interact with different legumes is not fully understood at molecular level. Analysis of a set of randomly generated mutants of R. leguminosarum bv viciae UPM1137 allowed the identification of a mutant impaired on its symbiotic association with pea, inducing only white, ineffective nodules with this host. Interestingly, the mutant retains the wild-type ability to effectively nodulate lentil plants, a phenotype that we designate as Host-specific symbiotic efficiency (Hse). Additionally, the mutant is impaired in the growth in rich media such as TY. Complementation of the mutant with a R. leguminosarum bv. viciae gene bank has allowed the identification of a 3-kb DNA region able to restore the Hse phenotype. The role of the genes present in the hse region is currently being analysed, and the results of this analysis will be presented in the communication. | |
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Internacional
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Si |
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Nombre congreso
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12th European Nitrogen Fixation Conference |
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Tipo de participación
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970 |
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Lugar del congreso
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Budapest |
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Revisores
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Si |
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ISBN o ISSN
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978-615-5270-26-0 |
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DOI
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Fecha inicio congreso
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25/08/2016 |
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Fecha fin congreso
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28/08/2016 |
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Desde la página
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250 |
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Hasta la página
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250 |
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Título de las actas
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978-615-5270-26-0 |