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Phylogenetic and phenotypic characterization of Fomes fasciatus and Fomes fomentarius in the United States

机译：在美国的Fass fasciatus和Fomes fomentarius的系统发育和表型表征

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摘要

The wood-decay fungi Fomes fasciatus and F. fomentarius share many morphological characters that historically have made species delimitation challenging. We examined morphological, molecular and physiological characters of basidiomata and pure cultures of F. fasciatus and F. fomentarius sampled from multiple plant hosts and geographic regions in the United States to determine whether they support separation of the two species. We find that mean basidiospore size is significantly larger in F. fomentarius and represents the most informative morphological character for delineating the species. Basidiomata and pore-surface shape provided additional resolution of the species, but these characters often overlap and are more variable than basidiospore size. Phylogenetic analyses of ITS and RPB2 sequences suggest that F. fasciatus and F. fomentarius represent distinct evolutionary lineages. The two species share less than 88% maximum identity for the ITS region Limited intraspecific sequence variation at each locus also was observed. In vitro experiments of hyphal-growth response to a wide range of temperatures support differences in physiology between the two species.
机译：木材腐烂真菌Fomes fasciatus和F. fomentarius具有许多形态特征，从历史上讲，这些特征使物种划分具有挑战性。我们检查了从美国多个植物寄主和地理区域取样的巴西菊苣和F. fasciatus和F. mentmentus的纯培养物的basidiomata的形态，分子和生理特征，以确定它们是否支持这两个物种的分离。我们发现，F。fomentarius的平均孢子孢子大小明显更大，并且代表了描述该物种的最有信息的形态特征。担子瘤和孔表面形状为该物种提供了额外的分辨率，但这些特征通常重叠且比担子孔大小更易变。 ITS和RPB2序列的系统发育分析表明，F。fasciatus和F. fomentarius代表不同的进化谱系。这两个物种在ITS区域的最大同一性低于88％，在每个基因座也观察到有限的种内序列变异。菌丝生长对多种温度的响应的体外实验支持了两种物种之间的生理差异。

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