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首页> 外文期刊>Mycologia >A phylogenetic redefinition of anamorph genera in Mycosphaerella based onITS rDNA sequence and morphology [Review]
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A phylogenetic redefinition of anamorph genera in Mycosphaerella based onITS rDNA sequence and morphology [Review]

机译：基于ITS rDNA序列和形态学的门球菌无性型属系统发育重新定义[综述]

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摘要

Anamorph genera associated with Mycosphaerella are separated on a combination of characters such as conidiomatal structure, the nature and arrangement of conidiophores, conidiogenesis, dehiscence scars and pigmentation. To date 27 genera have been reported as anamorphs of Mycosphaerella, 19 of which were included in this study. Based on the phylogeny of the ITS1, 5.8S, and ITS2 rDNA sequence data, Mycosphaerella proved to be monophyletic. The major group consisted of several small clusters correlating to specific anamorph genera, as well as other clusters containing an assemblage of anamorph genera. Although Mycosphaerella is monophyletic, it appears that many of the morphological characters defining different anamorph genera evolved more than once and for the most part do not represent true groups within Mycosphaerella. Nevertheless, the anamorph generic concepts contain valuable information of practical use to plant pathologists and mycologists working with these organisms. Based on these results, as well as a re-evaluation of the criteria upon which anamorph genera are distinguished in this complex, a reduced set of informative criteria and genera are proposed. The degree of scar thickening, darkening and refraction, as well as the presence or absence of pigmentation in conidiophores and conidia still appear to be useful features delimiting anamorph genera of Mycosphaerella.
机译：与霉菌属相关的无性型属在特征上分开，例如分生孢子虫的结构，分生孢子的性质和排列，分生孢子，裂裂疤痕和色素沉着。迄今为止，已经报道了27个属为球孢菌的变形体，其中19个属于该研究。根据ITS1、5.8S和ITS2 rDNA序列数据的系统发育史，证明了球菌是单系统的。主要类群包括与特定无性类属相关的几个小类群，以及其他包含无性类属集合的类群。尽管门孢菌属是单系的，但许多定义不同无性型属的形态特征似乎不止一次进化，并且在大多数情况下并不代表门氏菌内的真实群体。尽管如此，无性型通用概念仍然包含有价值的信息，这些信息对于处理这些生物的植物病理学家和真菌学家具有实用价值。基于这些结果，以及对在该复合物中区分无性型属的标准进行重新评估，提出了一套减少的信息性标准和属。疤痕增厚，变暗和折射的程度以及分生孢子和分生孢子中色素沉着的存在或不存在似乎仍然是界定霉菌属无性型的有用特征。

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