期刊
PLANT AND SOIL
卷 314, 期 1-2, 页码 169-182出版社
SPRINGER
DOI: 10.1007/s11104-008-9716-z
关键词
Rhizobia; Agricultural-forestry ecosystem; Population interaction; Legume; nodC; nifH
资金
- foundation of the State Key Basic Research and Development Plan of China [2006CB100206]
- National Natural Science Foundation of China [30670001]
- National Project for Basic S&T Platform Construction [2005DKA21201-10]
- IPN, Mexico [SIP 20070538, 20080322]
To investigate the diversity of rhizobia and interactions among the host legumes and rhizobial genotypes in the same habitat, a total of 97 rhizobial strains isolated from nine legume species grown in an agricultural-forestry ecosystem were identified into seven genomic species and 12 symbiotic genotypes within the genera Bradyrhizobium, Mesorhizobium, Rhizobium and Sinorhizobium based upon analyses of genomic DNA regions and symbiotic genes. The results evidenced that the symbiotic genotypes of rhizobia were consistent with their hosts of origin; revealed that vertical transfer was the main mechanism in rhizobia to maintain the symbiotic genes but lateral transfer of symbiotic genes might have happened between the closely related rhizobial species; suggested the existence of co-distribution and co-evolution among the legume hosts and compatible rhizobia. All of these data demonstrated that the biogeography of rhizobia was a result of interactions among the host legumes, bacterial genomic backgrounds and environments.
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