Diatomophthoraceae - 一个与 Ectrogella 基本无关的新的硅藻寄生虫家族。

Fungal systematics and evolution Pub Date : 2020-06-01 Epub Date: 2019-10-11 DOI:10.3114/fuse.2020.05.06
A T Buaya, M Thines
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引用次数: 0

摘要

外鞭毛菌属目前包括一组异质的强制性内寄生虫,主要寄生于硅藻和藻类。尽管它们广泛存在,但人们对这些奇异生物的系统发育亲缘关系知之甚少。传统上,该属被归入鞘鳃纲(Saprolegniales),其依据是孢子囊复眼和类似鞘鳃纲/鞘鳃亚纲的孢子囊排出。该属在过去经历了多次重新定义,经常被不加区分地用于硅藻中形成香肠状菌丝的卵菌。虽然多分化属 Olpidiopsis 的系统发育亲缘关系最近得到了部分解决,但 Ectrogella 属的分类定位仍未解决,因为没有该属物种的序列数据。在本研究中,我们报告了感染淡水硅藻 Nitzschia sigmoidea 的 Ectrogella bacillariacearum 的系统发育位置。系统发育重建结果表明,巴氏外盘蛆菌(Ectrogella bacillariacearum)以较高的支持率被归入无根羊膜菌科(Saprolegniomycetes)的早期分化世系,与单系的硅藻感染奥氏拟藻类(olpidiopsis-like species)无关。由于这些物种既不与 Ectrogella 相关,也不与 Olpidiopsis s. str. 和 Miracula 的早期分化品系相关,因此本研究将它们归入一个新属 Diatomophthora。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

<i>Diatomophthoraceae</i> - a new family of olpidiopsis-like diatom parasitoids largely unrelated to <i>Ectrogella</i>.

<i>Diatomophthoraceae</i> - a new family of olpidiopsis-like diatom parasitoids largely unrelated to <i>Ectrogella</i>.

Diatomophthoraceae - a new family of olpidiopsis-like diatom parasitoids largely unrelated to Ectrogella.

The oomycete genus Ectrogella currently comprises a rather heterogeneous group of obligate endoparasitoids, mostly of diatoms and algae. Despite their widespread occurrence, little is known regarding the phylogenetic affinities of these bizarre organisms. Traditionally, the genus was included within the Saprolegniales, based on zoospore diplanetism and a saprolegnia/achlya-like zoospore discharge. The genus has undergone multiple re-definitions in the past, and has often been used largely indiscriminately for oomycetes forming sausage-like thalli in diatoms. While the phylogenetic affinity of the polyphyletic genus Olpidiopsis has recently been partially resolved, taxonomic placement of the genus Ectrogella remained unresolved, as no sequence data were available for species of this genus. In this study, we report the phylogenetic placement of Ectrogella bacillariacearum infecting the freshwater diatom Nitzschia sigmoidea. The phylogenetic reconstruction shows that Ectrogella bacillariacearum is grouped among the early diverging lineages of the Saprolegniomycetes with high support, and is unrelated to the monophyletic diatom-infecting olpidiopsis-like species. As these species are neither related to Ectrogella, nor to the early diverging lineages of Olpidiopsis s. str. and Miracula, they are placed in a new genus, Diatomophthora, in the present study.

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