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首页> 外文期刊>Mycologia >Phylogeny of the genus Arthrobotrys and allied nematode-trapping fungi based on rDNA sequences.
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Phylogeny of the genus Arthrobotrys and allied nematode-trapping fungi based on rDNA sequences.

机译：基于rDNA序列的节肢动物和相关的捕线虫真菌的系统发育。

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摘要

Ribosomal DNA of 29 nematode-trapping fungi in the genera Arthrobotrys, Dactylella, Duddingtonia, Geniculifera, Monacrosporium, Nematoctonus, and 5 nonpredacious, allied fungi in the genera Orbilia, Trichothecium, Dactylaria, and Arthrobotrys was amplified by polymerase chain reaction and sequenced using universal primers. Phylogenetic analysis of 5.8S rDNA using parsimony indicated that 28 clampless nematode-trapping fungi were monophyletic and have evolved from a common ancestor. Clamped Nematoctonus robustus, having a Hohenbuehelia basidiomycetous teleomorph, was phylogenetically distant and the predacious habit was gained through convergent evolution. Nonpredacious Arthrobotrys, Dactylaria, and Trichothecium species, despite having morphologically similar conidiogenous cells and conidia, actually were grouped in a genetically distant region of the tree. Analysis of the more variable internal transcribed spacer, ITS1 and ITS2, revealed that the 28 nematode-trapping fungi were separated into 4clades, each with a unique trapping device. Phylogenetic analysis of rDNA of trapping fungi in this study indicated that trapping organs may reflect evolutionary relationship, and appear more significant than conidiogenous cells and conidia for genus andspecies delimitation. We suggest that the circumscription of the Arthrobotrys-Dactylella-Monacrosporium complex be revised to provide a natural classification system.
机译：通过聚合酶链反应，对节肢动物，拟杆菌，达丁顿氏菌，geniculifera，单孢菌，线虫，以及Orbilia，毛癣菌属，Dactylaria和通用节肢动物属中的5种非捕食性真菌的核糖体DNA进行了测序。底漆。用简约方法对5.8S rDNA进行系统进化分析表明，有28种无钳线虫诱捕真菌是单系真菌，并且是从共同祖先进化而来的。具有Hohenbuehelia basidiomycettous远程变型的钳状线虫线虫在系统发育上是远距离的，并且通过会聚进化获得了早熟的习性。尽管具有形态相似的分生孢子细胞和分生孢子，但非珍贵的节肢动物，线虫和毛癣菌物种实际上被分组在树的遗传上较远的区域。通过对内部转录间隔物ITS1和ITS2的可变性进行分析，发现将28种捕获线虫的真菌分为4个clad，每个clad都有一个独特的捕获装置。在这项研究中，对捕获真菌的rDNA进行的系统进化分析表明，捕获器官可能反映了进化关系，并且对于属和物种界线而言，捕获器官比分生孢子细胞和分生孢子更为重要。我们建议修订节肢动物-小球藻-单孢子孢子复合体的界限以提供自然的分类系统。

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