Occurrence, pathogenicity and species identification of Pythium causing root rot of soybean in Alberta and Manitoba, Canada
文献类型： 外文期刊
作者： Li, Nana 1 ; Zhou, Qixing 2 ; Chang, Kan-Fa 2 ; Yu, Haitian 3 ; Hwang, Sheau-Fang 2 ; Conner, Robert L. 4 ; Strelkov, 1 ;
作者机构： 1.Shandong Ctr Crop Germplasm Resources, Jinan 250100, Shandong, Peoples R China
2.Alberta Agr & Forestry, Crop Diversificat Ctr North, Edmonton, AB T5Y 6H3, Canada
3.Yunnan Acad Agr Sci, Inst Food Crops, Kunming 650205, Yunnan, Peoples R China
4.Agr & Agri Food Canada, Morden, MB R6M 1Y5, Canada
5.Univ Alberta, Dept Agr Food & Nutr Sci, Edmonton, AB T6G 2P5, Canada
6.AAFC, Brandon, MB R7A 5Y3, Canada
关键词： Pythium root rot; rDNA-ITS regions; Cytochrome oxidase gene; Aggressiveness; Soybeans
期刊名称：CROP PROTECTION （ 影响因子：2.571； 五年影响因子：3.11 ）
ISSN： 0261-2194
年卷期： 2019 年 118 卷
页码：
收录情况： SCI
摘要： Soybean (Glycine max (L.) Merr.) has been a commercial oilseed crop in Canada since the 1920s. The production of soybean rapidly increased from 2004 to 2016 in Alberta and Manitoba. Root rot disease caused by the oomycete genus Pythium was observed from 105 fields in 2015 and 2016 in southern Alberta and Manitoba. In the present study, a total of 97 isolates of Pythium were recovered from the root tissues of soybean seedling collected from those fields. Identification of the Pythium species was achieved by examining their morphological features and sequences analysis of internal transcribed spacers (ITS) and cytochrome oxidase subunit 2 gene (Cox II). Nine species of Pythium were identified, with Pythiwn violae as the predominant species (27 out of 97, 27.8%), followed by P. intermedium (21), P. irregulare (16), P. sylvaticum (12), P. recalcitrans (8), P. ultimum (8), P. heterothallicum (3), P. conidiophorum (1) and P. macrosporum (1). This is the first report of P. conidiophorum, P. recalcitrans and P. violae on soybean in Canada. All the Pythium isolates except three isolates (S2d of P. violae, S29a and S29b of P. heterothallicum) were highly virulent on soybean, causing root rot disease symptoms.
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