Diversification of Sinorhizobium populations associated with Medicago polymorpha and Medicago lupulina in purple soil of China
文献类型： 外文期刊
作者： Tang, Mingxing 1 ; Wang, Haoyu 1 ; Qi, Xin 1 ; He, Teng 1 ; Zhang, Bin 1 ; Wang, Entao 2 ; Yu, Miao 1 ; Wang, Beinan 1 ; Wang, Fang 3 ; Liu, Zhongkuan 4 ; Liu, Xiaoyun 1 ;
作者机构： 1.Hebei Univ, Inst Life Sci & Green Dev, Coll Life Sci, Key Lab Microbial Divers Res & Applicat Hebei Prov, Baoding, Peoples R China
2.Inst Politecn Nacl, Escuela Nacl Ciencias Biol, Dept Microbiol, Mexico City, Mexico
3.Southwest Forestry Univ, Key Lab State Forestry Adm Biodivers Conservat Sou, Kunming, Peoples R China
4.Hebei Acad Agr & Forestry Sci, Inst Agr Resources & Environm, Shijiazhuang, Peoples R China
关键词： Medicago; rhizobia; diversity; phylogeny; plant host; soil nutrient
期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：5.2； 五年影响因子：6.2 ）
ISSN：
年卷期： 2023 年 13 卷
页码：
收录情况： SCI
摘要： The double selection of environment adaptation and host specificity forced the diversification of rhizobia in nature. In the tropical region of China, Medicago polymorpha and Medicago lupulina are widely distributed, particularly in purple soil. However, the local distribution and diversity of rhizobia associated with these legumes has not been systematically investigated. To this end, root nodules of M. polymorpha and M. lupulina grown in purple soil at seven locations in Yunnan Province of China were collected for rhizobial isolation. The obtained rhizobia were characterized by RFLP of 16S-23S rRNA intergenic spacer, BOXAIR fingerprinting, and phylogeny of housekeeping and symbiosis genes. As result, a total of 91 rhizobial strains were classified into species Sinorhizobium medicae and S. meliloti, while three nodC gene types were identified among them. S. medicae containing nodC of type I was dominant in farmlands associated with M. polymorpha; while S. meliloti harboring nodC of type III was dominant in wild land nodulated by M. lupulina. For both rhizobial species, greater genetic diversity was detected in the populations isolated from their preferred host plant. A high level of genetic differentiation was observed between the two Sinorhizobium species, and gene flow was evident within the populations of the same species derived from different soil types, indicating that rhizobial evolution is likely associated with the soil features. To examine the effects of environmental features on rhizobial distribution, soil physicochemical traits and rhizobial genotypes were applied for constrained analysis of principle coordinates, which demonstrated that soil features like pH, nitrogen and sodium were the principle factors governing the rhizobial geographical distribution. Altogether, both S. medicae and S. meliloti strains could naturally nodulate with M. polymorpha and M. lupulina, but the rhizobium-legume symbiosis compatibility determined by both the host species and soil factors was also highlighted.
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