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Significant diversity and potential problems associated with inferring population structure within the Cenococcum geophilum species complex

机译：与推断土生球藻物种复合体内种群结构有关的重大多样性和潜在问题

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Cenococcum geophilum is perhaps the most widely distributed and most recognized ectomycorrhizal fungus with a host range of more than 200 tree species from 40 genera of both angiosperms and gymnosperms. We conducted a phylogenetic analysis on a large collection of isolates (n = 74) from North America and Europe based on glyceraldehyde 3-phosphate dehydrogenase (gpd). A subset of isolates (n = 22) also was analyzed with the more conservative LSU-rDNA locus. Significant nucleotide diversity was detected (similar to 20%) in the gpd region and the LSU-rDNA analysis supported that the C. geophilum isolates studied were monophyletic but distinct from two isolates, Amy-1 and N2-10, which previously were used in population genetic studies of this species. These results suggest that Am5-1 and N2-10 are likely two undescribed species or even genera. Our results suggest that C. geophilum sensu lato is a species complex and support previous molecular, physiological and morphological studies that have shown significant diversity in C. geophilum. This study also revealed that caution is advised when conducting population genetic studies in C. geophilum due to the possibility of pooling unrelated isolates. This potential problem also has implications for other fungal taxa because cryptic species routinely have been found in recent years based on molecular data.
机译：土生球藻可能是分布最广，最广为人知的外生菌根真菌，拥有被子植物和裸子植物40属的200多种树种。我们基于3-磷酸甘油醛脱氢酶（gpd）对北美和欧洲的大量分离株（n = 74）进行了系统发育分析。还使用更保守的LSU-rDNA基因座分析了分离株的一个子集（n = 22）。在gpd区检测到显着的核苷酸多样性（约20％），LSU-rDNA分析支持所研究的嗜地衣芽孢杆菌分离株是单系分离的，但不同于以前使用的两个分离株Amy-1和N2-10。该物种的种群遗传研究。这些结果表明，Am5-1和N2-10可能是两个未描述的物种，甚至属。我们的结果表明，C。geophilum sensu lato是一个物种复合体，支持以前的分子，生理和形态学研究，这些研究显示Geophilum的显着多样性。这项研究还表明，由于可能合并无关的分离株，因此在进行嗜地梭状芽胞杆菌的种群遗传研究时，建议谨慎行事。这个潜在的问题也对其他真菌类群有影响，因为近年来根据分子数据常规发现了隐性物种。

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