白蜡树（白蜡树属物种）上出现的白粉菌物种的系统发育和分类学。
Phylogeny and taxonomy of species (powdery mildew: ) occurring on the ash trees ( spp.).
作者信息
Yamaguchi Yusuke, Meeboon Jamjan, P Heluta Vasyl, Liu Shu-Yan, Feng Jing, Takamatsu Susumu
机构信息
a Faculty of Bioresources, Mie University.
b Institute of Vegetable and Floriculture Science, National Agriculture and Food Research Organization.
出版信息
Mycoscience. 2021 Mar 20;62(2):115-123. doi: 10.47371/mycosci.2020.11.009. eCollection 2021.
The genus (), known as ash trees, currently comprises 43 recognized species that are distributed in temperate and subtropical regions of the northern hemisphere. Two (sect. ) species have been known on spp. so far. In this study, powdery mildews from different areas of the world were collected to make molecular and morphological analyses. These specimens are divided into three distinct molecular phylogenetic groups, which are distinguishable by their morphology and/or host preference. The powdery mildew occurring on and is described as a new species, . Epitypes are designated for and . Applying previous traditional species delimitations, various hosts were shared by as well as , but the current analyses strongly suggest strict host specificity among these three powdery mildew species. Evolutionary timing calculated by molecular clock analysis suggests co-evolution of powdery mildews with their hosts.
梣属（Fraxinus），即白蜡树，目前包含43个已确认的物种，分布于北半球的温带和亚热带地区。到目前为止，在白蜡树属植物上已知有两个羽蜡蚧属（sect. Pterocarya）物种。在本研究中，收集了来自世界不同地区的白粉菌进行分子和形态分析。这些标本分为三个不同的分子系统发育组，可通过其形态和/或寄主偏好加以区分。在尖叶梣（Fraxinus oxyphylla）和白蜡树（Fraxinus chinensis）上出现的白粉菌被描述为一个新物种，即尖叶梣白粉菌（Erysiphe fraxinooxyphyllae）。指定了尖叶梣羽蜡蚧（Pterocarya fraxinifolia）和中国羽蜡蚧（Pterocarya chinensis）的后选模式。应用先前的传统物种界定方法，尖叶梣羽蜡蚧和中国羽蜡蚧有多种共同寄主，但目前的分析强烈表明这三种白粉菌物种之间存在严格的寄主特异性。通过分子钟分析计算的进化时间表明白粉菌与其白蜡树属寄主共同进化。
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