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Genetic diversity and biogeography of rhizobia associated with Caragana species in three ecological regions of China

机译:中国三个生态区与锦鸡儿属相关的根瘤菌的遗传多样性和生物地理学

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摘要

Twenty-two genospecies belonging mainly to Mesorhizobium, and occasionally to Rhizobium and Bradyrhizobium, were defined among the 174 rhizobia strains isolated from Caragana species. Highly similar nodC genes were found in the sole Bradyrhizobium strain and among all the detected Mesorhizobium strains. A clear correlation between rhizobial genospecies and the eco-regions where they were isolated was found using homogeneity analysis. All these results demonstrated that Caragana species had stringently selected the rhizobia symbiotic genotype, but not the genomic background; lateral transfer of symbiotic genes from Mesorhizobium to Bradyrhizobium and among the Mesorhizobium species has happened in the Caragana rhizobia; and biogeography of Caragana rhizobia exists. Furthermore, a combined cluster analysis, based upon the patterns obtained from amplified 16S rRNA gene and 16S-23S intergenic spacer restriction analyses, BOX PCR and SDS-PAGE of proteins, was reported to be an efficient method to define the genospecies.
机译:在从柠条属植物中分离出的174种根瘤菌中,有22种主要属于中生根瘤菌,有时还包括根瘤菌和缓生根瘤菌。在唯一的慢生根瘤菌菌株和所有检测到的中生根瘤菌菌株中发现了高度相似的nodC基因。使用同质性分析发现,根瘤菌的遗传种类与分离它们的生态区域之间存在明显的相关性。所有这些结果表明,柠条属植物严格选择了根瘤菌共生基因型,但没有选择基因组背景。柠条锦鸡儿发生了共生基因从中生根瘤菌到缓生根瘤菌的横向转移。并且存在柠条锦鸡儿的生物地理学。此外,据报道,基于从扩增的16S rRNA基因和16S-23S基因间隔区限制性分析,蛋白质的BOX PCR和SDS-PAGE获得的模式的组合聚类分析是定义基因型的有效方法。

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