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首页> 外文期刊>Applied Microbiology >Genetic and Metabolic Divergence within a Rhizobium leguminosarum bv. trifolii Population Recovered from Clover Nodules
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Genetic and Metabolic Divergence within a Rhizobium leguminosarum bv. trifolii Population Recovered from Clover Nodules

机译：豆科根瘤菌的遗传和代谢差异。从三叶草结节中回收的三叶草种群

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摘要

Rhizobia are able to establish symbiosis with leguminous plants and usually occupy highly complex soil habitats. The large size and complexity of their genomes are considered advantageous, possibly enhancing their metabolic and adaptive potential and, in consequence, their competitiveness. A population of Rhizobium leguminosarum bv. trifolii organisms recovered from nodules of several clover plants growing in each other's vicinity in the soil was examined regarding possible relationships between their metabolic-physiological properties and their prevalence in such a local population. Genetic and metabolic variability within the R. leguminosarum bv. trifolii strains occupying nodules of several plants was of special interest, and both types were found to be considerable. Moreover, a prevalence of metabolically versatile strains, i.e., those not specializing in utilization of any group of substrates, was observed by combining statistical analyses of Biolog test results with the frequency of occurrence of genetically distinct strains. Metabolic versatility with regard to nutritional requirements was not directly advantageous for effectiveness in the symbiotic interaction with clover: rhizobia with specialized metabolism were more effective in symbiosis but rarely occurred in the population. The significance of genetic and, especially, metabolic complexity of bacteria constituting a nodule population is discussed in the context of strategies employed by bacteria in competition.
机译：根瘤菌能够与豆科植物建立共生关系，通常占据高度复杂的土壤生境。他们的基因组的大尺寸和复杂性被认为是有利的，可能增强他们的代谢和适应能力，并因此提高他们的竞争力。豆科根瘤菌的种群。研究了从在土壤中彼此附近生长的几家三叶草植物的结节中回收的三叶生物，以了解它们的代谢生理特性与其在当地居民中的患病率之间的可能关系。豆类中的遗传和代谢变异性bv。占据数株植物小结节的三叶草菌株引起了特别的兴趣，并且发现这两种类型都很重要。此外，通过将Biolog测试结果的统计分析与遗传上不同的菌株的发生频率相结合，观察到了代谢通用菌株的流行，即那些不专门利用任何一组底物的菌株。关于营养需求的代谢多功能性并不直接有利于与三叶草的共生相互作用：具有专门代谢作用的根瘤菌在共生中更有效，但在人群中很少发生。在细菌在竞争中采用的策略的背景下，讨论了构成根瘤种群的细菌的遗传学意义，尤其是其代谢复杂性的重要性。

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