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Cytospora species associated with canker and dieback disease of Rosaceae in China

Cytospora species associated with canker and dieback disease...

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多彩菌物美丽中国——中国菌物学会2019年学术年会

作者： Meng Pan Chengming Tian Xinlei Fan The Key Laboratory for Silviculture and Conservation of Ministry of Education Beijing Forestry University

Cytospora canker is a destructive disease of numerous hosts and causes serious economic losses with a worldwide distribution. Identification of Cytospora species is difficult due to insufficient phylogenetic understanding and overlapped morphological characteristics. In this study, 48 fungal strains which covered nine genera of Rosaceae were isolated from branches or twigs with symptomatic canker and dieback disease in *** morphological observation and multilocus phylogeny of ITS, LSU, act, rpb2, tef1-α and tub2 gene regions, indicating 21 distinct lineages with high branch support. These include ten Cytospora species were new,i.e., C. cinnamoneus, C. cotoneastricola, C. ochreae, C. olivaceae, C. pruni-mume, C. roseae, C. rosicola, ***, C. sorbina, and C. tibetensis, and 11 known taxa include Cytospora erumpens, C. japonica, ***, C. leucostoma, C. mali, C. parasitica, C. populinopsis, C. schulzeri, C. sibiraeae, C. spiraeae and ***. This study provides an initial understanding of the taxonomy of Cytospora associated with canker and dieback disease of Rosaceae in China. The plants of Rosaceae are important ecological and economic tree species in China. The current study indicates that the incidence of Cytospora species is serious and have different symptoms in various hosts, including 20 host species of 9 genera in Rosaceae, i.e. Cotoneaster, Crataegus, Malus,Prunus, Pyrus, Rosa, Sibiraea, Sorbus and Spiraea. The result coincides with previous reports that widely extended Cytospora species have been identified to occur in many host species in the current study. Furthermore,Cytospora cotoneastricola, C. ochreae, C. tibetensis were all collected from Cotoneaster sp., which indicates that the same host could be infected by more than one species. At present, China is a hot place to study these taxa as many species of Cytospora are isolated from important hosts such as Rosaceae. Thus the further studies are required to discover the spe

关键词： cytosporaceae Rosaceae taxonomy

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