Genetic variability of soybean bradyrhizobia populations under different soil managements |
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| Authors: | Mariel Josue Bizarro Adriana Giongo Luciano Kayser Vargas Luiz Fernando Wurdig Roesch Kelsey Annette Gano Enilson Luiz Saccol de Sá Luciane Maria Pereira Passaglia Pedro Alberto Selbach |
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| Institution: | 1.Departamento de Ciência do Solo, Faculdade de Agronomia,Universidade Federal do Rio Grande do Sul,Porto Alegre,Brazil;2.Department of Microbiology and Cell Science,University of Florida,Gainesville,USA;3.Funda??o Estadual de Pesquisa Agropecuária,Porto Alegre,Brazil;4.Universidade Federal do Pampa,S?o Gabriel,Brazil;5.Departamento de Genética,Universidade Federal do Rio Grande do Sul,Porto Alegre,Brazil |
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| Abstract: | Due to their ecologic and economic importance, bradyrhizobia have been extensively studied in recent years. Since 1992, Bradyrhizobium elkanii SEMIA 587 and SEMIA 5019 and Bradyrhizobium japonicum SEMIA 5079 and SEMIA 5080 have been widely used in most Brazilian soybean fields. The objective of this work was to estimate
the genetic variability of bradyrhizobial isolates recovered from soils under rhizobial inoculation and different soil managements.
Only 25% of the isolates demonstrated high similarities to the original strains, and a strong correlation was obtained between
the bradyrhizobial genetic variability and soil management. A high level of genetic diversity was observed both within isolates
(H = 5.46) as well as among the different soil practices. Soil under no-tillage presented a higher bradyrhizobia diversity compared
with bradyrhizobia isolated from soil under conventional tillage. Serological characterization also indicated that B. elkanii strains SEMIA 587 and SEMIA 5019 were more competitive and presented a higher nodular occupancy capacity than strains belonging
to B. japonicum species in Southern Brazilian soils. |
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