Molecular diversity and phylogeny of rhizobia associated with Lablab purpureus (Linn.) grown in Southern China
文献类型: 外文期刊
第一作者: Chang, Yue Li
作者: Chang, Yue Li;Wang, En Tao;Sui, Xin Hua;Chen, Wen Xin;Wang, En Tao;Zhang, Xiao Xia
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关键词: GenBank sequence data;molecular diversity;phylogeny;phylogenetic tree;phylogenies;plant grownth
期刊名称:SYSTEMATIC AND APPLIED MICROBIOLOGY ( 影响因子:4.022; 五年影响因子:4.396 )
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收录情况: SCI
摘要: As an introduced plant, Lablab purpureus serves as a vegetable, herbal medicine, forage and green manure in China. In order to investigate the diversity of rhizobia associated with this plant, a total of 49 rhizobial strains isolated from ten provinces of Southern China were analyzed in the present study with restriction fragment length polymorphism and/or sequence analyses of housekeeping genes (16S rRNA, IGS, atpD, gInII and recA) and symbiotic genes (nifH and nodC). The results defined the L purpureus rhizobia as 24 IGS-types within 15 rrs-IGS clusters or genomic species belonging to Bradyrhizobium, Rhizobium, Ensifer (synonym of Sinorhizobium) and Mesorhizobium. Bradyrhizobium spp. (81.6%) were the most abundant isolates, half of which were B. elkanii. Most of these rhizobia induced nodules on L. purpureus, but symbiotic genes were only amplified from the Bradyrhizobium and Rhizobium leguminosarum strains. The nodC and nifH phylogenetic trees defined five lineages corresponding to B. yuanmingense, B. japonicum, B. elkanii, B. jicamae and R. leguminosarum. The coherence of housekeeping and symbiotic gene phylogenies demonstrated that the symbiotic genes of the Lablab rhizobia were maintained mainly through vertical transfer. However, a putative lateral transfer of symbiotic genes was found in the B. liaoningense strain. The results in the present study clearly revealed that L purpureus was a promiscuous host that formed nodules with diverse rhizobia, mainly Bradyrhizobium species, harboring different symbiotic genes
分类号: Q939.9
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