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首页> 外文期刊>Mycologia >Combined molecular and morphological data for improving phylogenetic hypothesis in Dacrymycetes
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Combined molecular and morphological data for improving phylogenetic hypothesis in Dacrymycetes

机译：结合分子和形态学数据，以改善芽孢杆菌的系统发育假设

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摘要

We analyzed the DNA sequences of four gene regions, 28S and 18S rDNA, the ITS region and rpb2, to obtain a high resolution phylogenetic tree of Dacrymycetes. In addition, we comparatively studied micro- and macromorphological characteristics of representative species. The traditional generic classification based on morphological characteristics was not reflected by our molecular phylogenies. Ancestral state reconstructions indicated that the morphology of basidia and clamp connections are evolutionarily stable. In contrast, basidiocarps and basidiospore septation patterns appear variable. Dacrymyces unisporus shares the dolipores with non-perforate parenthesomes typical of other dacrymycetous taxa but is a unique species having predominantly non-bifurcate basidia and subglobose to ovoid basidiospores with transverse and longitudinal septa. In molecular phylogenies this species is a member of Dacrymycetes but always occupies a sister position in relation to the rest of the Dacrymycetes. Based on our results we propose a new genus, Unilacryma, for D. unisporus. For proper accommodation of this taxon, we introduce the family Unilacrymaceae and the order Unilacrymales.
机译：我们分析了四个基因区域，即28S和18S rDNA，ITS区域和rpb2的DNA序列，以获得高分辨率的芽孢杆菌系统树。此外，我们比较研究了代表性物种的微观和宏观形态特征。基于形态学特征的传统通用分类没有被我们的分子系统发育所反映。祖先状态的重建表明，基底和钳夹连接的形态在进化上是稳定的。相比之下，拟果皮和担子孢子的分离模式似乎是可变的。芽孢杆菌属与其他乳腺真菌类群的典型非穿孔的圆括号共享多脂脂，但是独特的种类，主要具有非分叉的芽胞和近球状到卵圆形的有孢子的横生和纵向间隔。在分子系统发育中，该物种是芽孢杆菌科的成员，但相对于其余的芽孢杆菌科，其始终处于姐妹位置。根据我们的研究结果，我们提出了一种新的Unilacryma属，用于D. unisporus。为了适当地容纳这个分类单元，我们介绍了Unilacrymaceae科和Unilacrymales目。

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