Detection of the type III secretion system and its phylogenetic and symbiotic characterization in peanut bradyrhizobia isolated from Guangdong Province,China |
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Authors: | Huaqin Ruan Meijuan Hu Jingyu Chen Xue Li Ting Li Yongxiu Lai En Tao Wang Jun Gu |
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Institution: | 1. School of Life Science, South China Normal University, Guangzhou 510631, Guangdong, China;2. Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, 11340 Mexico, D.F., Mexico |
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Abstract: | The distribution of rhcRST and rhcJ-C1 fragments located in different loci of the type III secretion system (T3SS) gene cluster in the peanut-nodulating bradyrhizobia isolated from Guangdong Province, China was investigated by PCR-based sequencing. T3SS was detected in approximately one-third of the peanut bradyrhizobial strains and the T3SS-harboring strains belonging to different Bradyrhizobium genomic species. Diverse T3SS groups corresponding to different symbiotic gene types were defined among the 23 T3SS-harboring strains. The same or similar T3SS genes were detected in different genospecies, indicating that interspecies horizontal transfer of symbiotic genes had occurred in the Bradyrhizobium genus. |
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Keywords: | Symbiotic Bradyrhizobia T3SS Peanut Genetic |
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