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Biological characterization and genetic diversity analysis of two species of Pestalotiopsis causing twig dieback of Myrica rubra

文献类型： 外文期刊

作者： Chen, Fangyong 1 ; Lu, Lianming 1 ; Wang, Dongmi 2 ; Wang, Yin 1 ; Ni, Haizhi 1 ; Du, Zhenguo 3 ;

作者机构： 1.Citrus Res Inst Zhejiang Prov, Taizhou 318020, Peoples R China

2.Forestry & Sci Inst Taizhou, Taizhou 318000, Peoples R China

3.Guangdong Acad Agr Sci, Plant Protect Res Inst, Guangzhou 510640, Guangdong, Peoples R China

关键词： Myrica rubra;Twig dieback disease;Pestalotiopsis mangiferae P. vismiae;Biological characteristics;Genetic diversity;Pathogenicity

期刊名称：EUROPEAN JOURNAL OF PLANT PATHOLOGY （ 影响因子：1.907； 五年影响因子：2.022 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Chinese bayberry (Myrica rubra Siebold & Zucc) is an evergreen fruit tree with high ecological and economic values in China. In recent years, a new twig dieback disease caused by Pestalotiopsis mangiferae and P. vismiae was observed in major M. rubra-producing areas of Zhejiang and Fujian Provinces, causing serious economic losses. In this study, 16 isolates of P. mangiferae and 27 isolates of P. vismiae were obtained from diseased leaves, roots and branches of M. rubra from different regions. The optimum growth temperature of the two species of Pestalotiopsis was determined to be 20-25 A degrees C, while the optimum temperature for the germination of conidia was 25-35 A degrees C. The two species of Pestalotiopsis showed rich genetic diversity. Inoculating the conidial suspension of one or both of the two species of the Pestalotiopsis on detached leaves or branches of M. rubra could cause lesions surrounding the inoculation sites with the frequency of 100 %. Moreover, necrotic lesions could be observed on inoculated potted plants with the frequencies of 33.3 % for P. mangiferae, 25 % for P. vismiae and 50 % for a mixed inoculum.

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