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Ecological fitness of fludioxonil-resistant Rhizoctonia cerealis strain and its cross-resistance to DMIs and validamycin

文献类型： 外文期刊

作者： Xia, Xiaoming 1 ; Zhao, Ming 1 ; Wang, Hongyan 1 ; Wang, Kaiyun 2 ; Ma, Hui 1 ;

作者机构： 1.Shandong Acad Agr Sci, Cotton Res Ctr, Jinan 250100, Shandong, Peoples R China

2.Shandong Agr Univ, Coll Plant Protect, Tai An 271018, Shandong, Peoples R China

关键词： Rhizoctonia cerealis;fludioxonil;resistance;cross-resistance

期刊名称：JOURNAL OF FOOD AGRICULTURE & ENVIRONMENT （ 影响因子：0.435； 五年影响因子：0.484 ）

ISSN： 1459-0255

年卷期： 2012 年 10 卷 3-4 期

页码：

收录情况： SCI

摘要： Strain of Rhizoctonia cerealis, highly resistant to fludioxonil, was isolated after 36 subcultures on the PDA-amended with fludioxonil. The resistance factor of the resistant strain was 20.04-fold relative to the wild-type strain. The resistance was stable after eight transfers in fludioxonil-free medium. The resistant strain was sensitive to high and moderate osmotic pressures and showed reductions in the ecological fitness such as reduced mycelial growth and sclerotia numbers, but had enhanced sclerotial weight compared with the wild-type. Slight cross-resistance relationships were found between fludioxonil and tebuconazole and validamycin, with 3.42- and 2.87-fold decreased sensitivity in comparison with the wild-type strain. In contrast, the resistant strain indicated a slight negative cross-resistance between fludioxonil and difenoconazole and propiconazole, and showed a 0.76- and 0.65-fold increased sensitivity to these fungicides.

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