Open AccessBradyrhizobium elkanii , Bradyrhizobium yuanmingense and Bradyrhizobium japonicum are the main rhizobia associated with Vigna unguiculata and Vigna radiata in the subtropical region of China
Author(s) -
Zhang Yong Fa,
Wang En Tao,
Tian Chang Fu,
Wang Feng Qin,
Han Li Li,
Chen Wen Feng,
Chen Wen Xin
Publication year - 2008
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2008.01169.x
Subject(s) - vigna , rhizobia , bradyrhizobium , bradyrhizobium japonicum , biology , radiata , rhizobium leguminosarum , rhizobiaceae , botany , rhizobium , mesorhizobium , symbiosis , horticulture , bacteria , inoculation , genetics
Cowpea ( Vigna unguiculata ) and mung bean ( Vigna radiata ) are important legume crops yet their rhizobia have not been well characterized. In the present study, 62 rhizobial strains isolated from the root nodules of these plants grown in the subtropical region of China were analyzed via a polyphasic approach. The results showed that 90% of the analyzed strains belonged to or were related to Bradyrhizobium japonicum , Bradyrhizobium liaoningense , Bradyrhizobium yuanmingense and Bradyrhizobium elkanii , while the remaining represented Rhizobium leguminosarum , Rhizobium etli and Sinorhizobium fredii . Diverse nifH and nodC genes were found in these strains and their symbiotic genes were mainly coevolved with the housekeeping genes, indicating that the symbiotic genes were mainly maintained by vertical transfer in the studied rhizobial populations.