Journal
BIOLOGY AND FERTILITY OF SOILS
Volume 50, Issue 1, Pages 123-132Publisher
SPRINGER
DOI: 10.1007/s00374-013-0840-4
Keywords
Plant growth-promoting bacteria; Rhizobia; Diversity
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Funding
- International Foundation for Science (IFS, Sweden)
- Fundacao Estadual de Amparo a Pesquisa (FAPERGS, Brazil)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, Brazil)
- INCT da Fixacao Biologica do Nitrogenio (Brazil)
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In this study, rhizobia strains isolated from white clover (Trifolium repens) root nodules were evaluated in an effort to identify an efficient nitrogen-fixing rhizobia strain that can also improve the growth of rice plants (Oryza sativa). White clover plants were collected from seven sites in south Brazil, and 78 native rhizobia isolates were obtained. The genetic diversity analysis of those isolates was carried out by BOX-polymerase chain reaction. Overall, the native rhizobia isolated showed a high genetic diversity, but when the bacterial isolates from the same site were compared, the diversity was lower. One native rhizobia, POA3 (isolated from the Porto Alegre locality), was able to promote the growth of both plants and is therefore a good candidate for new inoculant formulation. Finally, we can conclude that the community of native rhizobia symbiont of white clover plants in southern Brazil is highly diverse and the growth promotion effect of rhizobia inoculation on rice plants was more pronounced in a poor nutrient substrate condition than in a rich nutrient substrate condition.
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