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JOURNAL ARTICLE

Biodiversity of rhizobia present in plant nodules of Biserrula pelecinus across Southwest Spain

María Camacho, Carlos Medina, Dulce Nombre Rodríguez-Navarro, Francisco Temprano Vera
Systematic and Applied Microbiology 2019 March 25
30952451
Biodiversity studies of native Mesorhizobium spp. strains able to nodulate the annual herbaceous legume Biserrula pelecinus L. in soils from Southwest Spain have been carried out. One or two isolates per plant, 30 in total, were randomly selected for further characterization. There was no association between the presence of mesorhizobia nodulating-B. pelecinus and the chemical or textural properties of the soils. The isolates were tested for their symbiotic effectiveness on this forage legume under greenhouse conditions and characterized on the basis of physiological parameters: carbon source utilisation (API 50CH), 16S rRNA sequencing and ERIC-PCR, lipopolysaccharide, protein and plasmid profiles. Our results show that in spite of the great diversity found among the native isolates, most of them belong to the genus Mesorhizobium, the exception being strain B24 which sequence matches 97.52% with Neorhizobium huautlense; this is the first description of a Neorhizobium strain effectively nodulating-biserrula plants. Results of a field trial indicated that some of these isolates could be recommended as inoculants for this legume. B24=DSM 28743=CECT 8815; ENA (HF955513) 16S rRNA sequences of isolates B13, B18, B26, B30 and B1 are deposited at ENA under numbers LS999402 to LS999406, respectively.

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