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Pathotype Identification and Virulence Variation in Cochliobolus sativus in China

文献类型： 外文期刊

作者： Chen, Lin 1 ; Yao, Quanjie 1 ; Wang, Fengtao 1 ; Pang, Yunxing 1 ; Lang, Xiaowei 1 ; Sun, Dan 2 ; Zhou, Jun 3 ; Feng, Jing 1 ; Lin, Ruiming 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pests, Beijing 100193, Peoples R China

2.Heilongjiang Acad Agr Sci, Crop Resources Inst, Harbin 150086, Peoples R China

3.Hongxinglong Agr Sci Res Inst, Jiamusi 155811, Peoples R China

关键词： barley; China; Cochliobolus sativus; host specialization; spot blotch; virulence; wheat

期刊名称：PLANT DISEASE （ 影响因子：4.614； 五年影响因子：5.33 ）

ISSN： 0191-2917

年卷期： 2022 年 106 卷 2 期

页码：

收录情况： SCI

摘要： Spot blotch caused by Cochliobolus sativus has become an important disease in the wheat-growing regions in China that has resulted from changes in the regional climate, agricultural cultivation patterns, and the susceptible wheat varieties that are widely grown. Little information is available about virulence variability and pathogenic specialization of the C. sativus isolates from major wheat-growing regions in China. Here, 12 representative wheat varieties and foundation breeding stocks were selected to characterize the pathotypes of C. sativus isolates from infected wheat plants. Based on the infection phenotypes in the 12 differential genotypes at the seedling stage, 70 Chinese pathotypes were identified from 110 isolates and clustered into three virulence groups. The high virulence isolates were collected from wheat leaves, crowns, and roots, with most (10 of 14) from the Henan province in the Huang-Huai plain. No relationship was evident between virulence variability of C. sativus isolates and their geographic origins or types of diseased wheat tissues. C. sativus showed a significant pathogenic specialization in hosts of wheat and barley. Most of the wheat isolates (50 of 65) were avirulent to all the differential barley genotypes, and a few were virulent only to highly susceptible barley genotypes. These results indicated that C. sativus isolates from the wheat-growing regions in China varied considerably for their virulence in wheat varieties, and showed significant pathogenic specialization to the wheat and barley hosts.

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