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A study of the genetic variability of Rhizoblaca chrysoleuca using DNA sequences and secondary metabolic substances

机译：利用DNA序列和次生代谢物质研究金龟根瘤菌的遗传变异性

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Specimens of Rhizoplaca chrysoleuca from Mount Wuling can be divided into two distinct groups based on obvious differences in morphological characters. Here we investigated 26 specimens of R. chrysoleuca from Mount Wuling, 10 specimens of this species from other areas and seven specimens of other Rhizoplaca species by analyzing morphology, chemistry and genetics. Nine chemotypes were detected among the specimens of R. chrysoleuca from Mount Wuling, and five of them were reported for the first time. Based on the ITS phylogenetic analysis, the chemotypes and the insertion distribution patterns in SSU rDNA, the samples of R. chrysoleuca from Mount Wuling were grouped in two distinct clades corresponding to two phenotypic groups and no gene flow was detected between these two groups. Our results establish all individuals of Rhizoplaca chrysoleuca are conspecific although some populations have been isolated on Mount Wuling, indicating that they are in the process of speciation. Our study also reveals that the relationships between genotypes and chemotypes are complicated and should be avoided, and we instead recommend using single individuals or few individuals from the same site to represent the population or whole species in systematics study. The results also indicate that Rhizoplaca chrysoleuca might provide a good model for studying the speciation of saxicolous lichenized fungi.
机译：根据形态特征的明显差异，可将武陵山的根瘤菌的标本分为两个不同的组。在这里，我们通过分析形态，化学和遗传学，调查了来自武陵山的金缕梅的26个标本，其他地区的该物种的10个标本和其他根瘤菌属的7个标本。在武陵山的菊科植物标本中检出了9种化学型，其中有5种是首次报道。根据ITS系统发育分析，SSU rDNA的化学型和插入分布模式，将武陵山的金缕梅样品分为两个不同的进化枝，分别对应两个表型组，并且在这两个组之间未检测到基因流。我们的结果表明，尽管在武陵山上已经隔离了一些种群，但金眼根瘤菌的所有个体都是同种的，这表明他们正在形成物种。我们的研究还表明，基因型与化学型之间的关系很复杂，应避免使用，我们建议在系统研究中使用同一地点的单个或几个个体来代表种群或整个物种。研究结果还表明，金毛根瘤菌可能为研究剑麻地衣真菌的形态提供了一个很好的模型。

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