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Diversity of a soybean rhizobial population adapted to a Cerrados soil

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Abstract

One hundred isolates were trapped by soybean (Glycine max) plants inoculated with a soil from the Cerrados, the main producing area in Brazil. The soil was originally void of rhizobia able to nodulate soybean, and 15 years before received inoculant containing Bradyrhizobium elkanii strains SEMIA 587 and SEMIA 5019; the area has been annually cropped with soybean since then, but with no further inoculation for the past 7 years. Enormous diversity was observed among the isolates, with thirteen serologically distinct groups, twelve protein and seven lipopolysaccharide profiles; no more than five isolates shared similar characteristics. An unexpected feature was that 48% of the isolates showed multiple reactions with the antisera to the serogroups established in the soils. Also 40% of the isolates reacted with the antiserum to B. japonicum strain SEMIA 566, that has never been introduced into the soil, probably due to dispersion from other cropping areas, associated with its high saprophytic competence; 13% of the isolates did not react with any of the antisera. Nodulation and N2 fixation capacity also varied considerably among the isolates. Although one third of the isolates were fast growers with an acid reaction in vitro, and many formed pseudo-nodules on common bean (Phaseolus vulgaris), they shared several properties with the Bradyrhizobium inoculant strains. A high level of genetic diversity was confirmed when the DNAs were amplified with BOX and RPO1 primers, and several isolates were positioned in far different clusters in the analysis of interspersed repetitive or nif-directed sequences. Moreover, serological properties showed higher correlation with BOX than with RPO1 products. The high diversity could be attributed both to lateral transfer of genetic material between inoculant and indigenous strains and to genomic rearrangements during the adaptation to the Cerrados, and may play an important role as a biological buffer, avoiding the dominance of a particular strain.

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Authors and Affiliations

  1. UFPR-Depto. de Genética, Cx. Postal 19071, 81531-990, Curitiba, PR, Brazil

    L.V. Galli-Terasawa & C. Glienke-Blanco

  2. Embrapa Soja, Cx. Postal 231, 86001-970, Londrina, PR, Brazil

    M. Hungria

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  1. L.V. Galli-Terasawa
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  2. C. Glienke-Blanco
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  3. M. Hungria
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Galli-Terasawa, L., Glienke-Blanco, C. & Hungria, M. Diversity of a soybean rhizobial population adapted to a Cerrados soil. World Journal of Microbiology and Biotechnology 19, 933–939 (2003). https://doi.org/10.1023/B:WIBI.0000007324.50022.c0

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  • DOI: https://doi.org/10.1023/B:WIBI.0000007324.50022.c0

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