Pseudocosmospora, a new genus to accommodate Cosmospora vilior and related species
Pseudocosmospora, a new genus to accommodate Cosmospora vilior and related species
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DOI：
10.3852/12-395
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发表时间：
2013-09-01
期刊：
影响因子：
2.8
通讯作者：
Chaverri, Priscila
中科院分区：
文献类型：
--
作者：
Herrera, Cesar S.;Rossman, Amy Y.;Chaverri, Priscila
Cosmospora sensu Rossman是一种小的、红色的、光滑的、薄壁的核孢真菌，但最近被发现是多系的，并被分成多个属。并不是所有的宇宙孢子类真菌都被系统地处理过。其中一些物种包括C. viilior和许多通常被标记为“Cosmospora sp.”的标本。本研究的目的是利用最近收集的标本，通过在形态、寄主和地理上与模式标本一致的分类来确定C. viilior的身份，并确定其在Cosmospora sensu lato和Nectriaceae中的系统发育位置。以ITS、LSU、MCM7、rpb1、tef1、tub 6个基因座为基础构建多位点系统发育模型。系统发育分析结果表明，C. viilior与其他类似宇宙孢子的真菌（子囊菌科、Sordariomycetes、Xylariales、Diatrypaceae）形成一个单系类群，具有类似顶孢的变形，并寄生于真孢子和真孢子菌。这个群体在系统发育上不同于其他先前分离的属。一个新的属，Pseudocosmospora，被描述为容纳模式种，P. eutypellae，和9个额外的物种在这个分支。
Cosmospora sensu Rossman accommodated nectroid fungi with small, reddish, smooth, thin-walled perithecia but recently was found to be polyphyletic and has been segregated into multiple genera. Not all cosmospora-like fungi have been treated systematically. Some of these species include C. vilior and many specimens often labeled "Cosmospora sp." The objectives of this research were to establish the identity of C. vilior through epitypication using a recent collection that agrees with the type specimen in morphology, host and geography and to determine its phylogenetic position within Cosmospora sensu lato and the Nectriaceae. A multilocus phylogeny was constructed based on six loci (ITS, LSU, MCM7, rpb1, tef1, tub) to estimate a phylogeny. Results from the phylogenetic analyses indicated that C. vilior forms a monophyletic group with other cosmospora-like fungi that have an acremonium-like anamorph and that parasitize Eutypa and Eutypella (Ascomycota, Sordariomycetes, Xylariales, Diatrypaceae). The group is phylogenetically distinct from other previously segregated genera. A new genus, Pseudocosmospora, is described to accommodate the type species, P. eutypellae, and nine additional species in this clade.