Genetic Diversity and Population Structure of Plenodomus biglobosus on Flixweed (Descurainia sophia) in Northwestern China
文献类型： 外文期刊
第一作者： Luo, Tao
作者： Luo, Tao;Si, Wei;Wu, Mingde;Zhang, Jing;Li, Guoqing;Yang, Long;Luo, Tao;Si, Wei;Wu, Mingde;Zhang, Jing;Li, Guoqing;Yang, Long;Jia, Donghai
作者机构：
关键词：
blackleg; flixweed; mating type; pennycress;
期刊名称：PLANT DISEASE （ 影响因子：4.4； 五年影响因子：4.8 ）
ISSN： 0191-2917
年卷期： 2025 年 109 卷 1 期
页码：
收录情况： SCI
摘要： Plenodomus biglobosus (Pb), a causal agent of blackleg of rapeseed, is composed of several subspecies, including 'australensis' (Pba), 'brassicae' (Pbb) and 'canadensis' (Pbc). Besides rapeseed, Pb can infect many wild cruciferous plants (WCPs), such as flixweed (Descurainia sophia) and pennycress (Thlaspi arvense), which may become the infection source for blackleg of rapeseed. However, Pb on WCPs has not been well investigated in China. This study identified the blackleg fungi on two WCPs in Sayram Lake and Zhaosu County in Xinjiang, China: flixweed (15 isolates) and pennycress (1 isolate) as well as on rapeseed (971 isolates). They belonged to Pba (11), Pbb (18), and Pbc (958). Pba occurred on flixweed (10) and pennycress (1) only in Sayram Lake, whereas Pbb and Pbc occurred on flixweed (1 and 4 isolates, respectively) and rapeseed (17 and 954 isolates, respectively) in Zhaosu County. Then, virulence of 16 isolates from flixweed and pennycress was determined on rapeseed. Their genomes were sequenced and used to identify the mating-type idiomorphs and to analyze population genetic structure. Results showed that all of the 16 isolates were virulent to rapeseed. Only MAT1-1 was detected in 11 Pba isolates, implying that Pba may lack sexual reproduction. The 16 isolates from two WCPs were divided into four genetic groups: Group I for Pbc (4 isolates), Group II for Pbb (1 isolate), and Group III (3 isolates) and IV (8 isolates) for Pba. The findings about the single mating type in Pba and its limited geographic distribution provided a case showing the importance of sexual reproduction in epidemics of Pb. To the best of our knowledge, this is the first report of Pba, Pbb, and Pbc on flixweed and Pba on pennycress in China.
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