Phylogenetics and evolution of nematode-trapping fungi (Orbiliales) estimated from nuclear and protein coding genes
Phylogenetics and evolution of nematode-trapping fungi (Orbiliales) estimated from nuclear and protein coding genes
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DOI：
10.1080/15572536.2006.11832753
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发表时间：
2005-09
期刊：
影响因子：
2.8
通讯作者：
Y. Li;K. Hyde;R. Jeewon;L. Cai;D. Vijaykrishna;Keqin Zhang
中科院分区：
文献类型：
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作者：
Y. Li;K. Hyde;R. Jeewon;L. Cai;D. Vijaykrishna;Keqin Zhang
基于28S rDNA、5.8S rDNA和β-微管蛋白基因的系统发育分析，重新定义了捕获线虫真菌的系统分类。分子数据分析采用最大简约、最大似然和贝叶斯分析。提供了一个修订的线虫捕获真菌的一般概念。关节关节的特点是粘接网络，dactyellina是粘接旋钮，Drechslerella是收缩环。在Dactylellina中，以柄状粘着旋钮和非收缩环为特征的分类群的系统发育位置也得到了证实。产生无柄黏附钮并长成环状的物种从甘氏菌转移到Dactylellina，产生无柄黏附钮并长成网状的物种从甘氏菌转移到Arthrobotrys。目前限定的甘氏菌不能作为一个有效属来对待。基于多基因数据和形态学研究，提出了诱捕装置进化的假设。掠食性和非掠食性真菌似乎都来自于欧比利亚的非掠食性成员。粘接旋钮被认为是捕集装置的祖先类型，其中收缩环和网络通过两条途径衍生。在第一个途径中，粘接旋钮保留其粘接材料形成简单的二维网络，最终形成复杂的三维网络。在第二种途径中，粘性旋钮失去了它们的粘性材料，它们的末端相遇形成非收缩环，然后它们又形成了带有三个膨胀细胞的收缩环。
The systematic classification of nematode-trapping fungi is redefined based on phylogenies inferred from sequence analyses of 28S rDNA, 5.8S rDNA and β-tubulin genes. Molecular data were analyzed with maximum parsimony, maximum likelihood and Bayesian analysis. An emended generic concept of nematode-trapping fungi is provided. Arthrobotrys is characterized by adhesive networks, Dactylellina by adhesive knobs, and Drechslerella by constricting-rings. Phylogenetic placement of taxa characterized by stalked adhesive knobs and non-constricting rings also is confirmed in Dactylellina. Species that produce unstalked adhesive knobs that grow out to form loops are transferred from Gamsylella to Dactylellina, and those that produce unstalked adhesive knobs that grow out to form networks are transferred from Gamsylella to Arthrobotrys. Gamsylella as currently circumscribed cannot be treated as a valid genus. A hypothesis for the evolution of trapping-devices is presented based on multiple gene data and morphological studies. Predatory and nonpredatory fungi appear to have been derived from nonpredatory members of Orbilia. The adhesive knob is considered to be the ancestral type of trapping device from which constricting rings and networks were derived via two pathways. In the first pathway adhesive knobs retained their adhesive material forming simple two-dimension networks, eventually forming complex three-dimension networks. In the second pathway adhesive knobs lost their adhesive materials, with their ends meeting to form nonconstricting rings and they in turn formed constricting rings with three inflated-cells.