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Ancestral state reconstruction infers phytopathogenic origins of sooty blotch and flyspeck fungi on apple

机译：祖先状态重建推断苹果上的煤烟斑和蝇斑真菌的致病原

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摘要

Members of the sooty blotch and flyspeck (SBFS) complex are epiphytic fungi in the Ascomycota that cause economically damaging blemishes of apples worldwide. SBFS fungi are polyphyletic, but approx. 96% of SBFS species are in the Capnodiales. Evolutionary origins of SBFS fungi remain unclear, so we attempted to infer their origins by means of ancestral state reconstruction on a phylogenetic tree built utilizing genes for the nuc 28S rDNA (approx. 830 bp from near the 5' end) and the second largest subunit of RNA polymerase II (RPB2). The analyzed taxa included the well-known genera of SBFS as well as non-SBFS fungi from seven families within the Capnodiales. The non-SBFS taxa were selected based on their distinct ecological niches, including plant-parasitic and saprophytic species. The phylogenetic analyses revealed that most SBFS species in the Capnodiales are closely related to plant-parasitic fungi. Ancestral state reconstruction provided strong evidence that plant-parasitic fungi were the ancestors of the major SBFS lineages. Knowledge gained from this study may help to better understand the ecology and evolution of epiphytic fungi.
机译：煤烟斑点和蝇斑（SBFS）复合物的成员是子囊菌的附生真菌，在全球范围内造成经济破坏性苹果斑点。 SBFS真菌是多系真菌，但是大约。 SBFS物种中有96％位于Capnodiales中。 SBFS真菌的进化起源尚不清楚，因此我们尝试通过利用nuc 28S rDNA基因（距离5'端约830 bp）和第二大亚基构建的系统发育树，通过祖先状态重建来推断其起源。 RNA聚合酶II（RPB2）的片段。分析的分类单元包括the藜科的七个科的SBFS以及非SBFS真菌的著名属。非SBFS分类单元的选择基于其独特的生态位，包括植物寄生和腐生植物。系统发育分析表明，the藜中的大多数SBFS物种与植物寄生真菌密切相关。祖先状态的重建提供了有力的证据，证明寄生植物真菌是主要SBFS谱系的祖先。从这项研究中获得的知识可能有助于更好地了解附生真菌的生态学和进化。

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