alexa Genetic characterization of fast-growing rhizobia able to nodulate Prosopis alba in North Spain.
Microbiology

Microbiology

Journal of Microbial & Biochemical Technology

Author(s): Iglesias O, Rivas R, GarcaFraile P, Abril A, Mateos PF,

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Abstract Prosopis is a Mimosaceae legume tree indigenous to South America and not naturalized in Europe. In this work 18 rhizobial strains nodulating Prosopis alba roots were isolated from a soil in North Spain that belong to eight different randomly amplified polymorphic DNA groups phylogenetically related to Sinorhizobium medicae, Sinorhizobium meliloti and Rhizobium giardinii according to their intergenic spacer and 16S rRNA gene sequences. The nodC genes of isolates close to S. medicae and S. meliloti were identical to those of S. medicae USDA 1,037(T) and S. meliloti LMG 6,133(T) and accordingly all these strains were able to nodulate both alfalfa and Prosopis. These nodC genes were phylogenetically divergent from those of the isolates close to R. giardinii that were identical to that of R. giardinii H152(T) and therefore all these strains formed nodules in common beans and Prosopis. The nodC genes of the strains isolated in Spain were phylogenetically divergent from that carried by Mesorhizobium chacoense Pr-5(T) and Sinorhizobium arboris LMG 1,4919(T) nodulating Prosopis in America and Africa, respectively. Therefore, Prosopis is a promiscuous host which can establish symbiosis with strains carrying very divergent nodC genes and this promiscuity may be an important advantage for this legume tree to be used in reforestation. This article was published in FEMS Microbiol Lett and referenced in Journal of Microbial & Biochemical Technology

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