3 years ago

Detection of the type III secretion system and its phylogenetic and symbiotic characterization in peanut bradyrhizobia isolated from Guangdong Province, China

Huaqin Ruan, Meijuan Hu, Jingyu Chen, Xue Li, Ting Li, Yongxiu Lai, En Tao Wang, Jun Gu

Publication date: September 2018

Source: Systematic and Applied Microbiology, Volume 41, Issue 5

Author(s): Huaqin Ruan, Meijuan Hu, Jingyu Chen, Xue Li, Ting Li, Yongxiu Lai, En Tao Wang, Jun Gu

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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