Host-Adaptive Divergence Shapes the Genetic Architecture of Magnaporthe oryzae in Southern China's Rice Agroecosystems
文献类型： 外文期刊
作者： Liu, Xin 1 ; Fu, Jun 1 ; Deng, Zhao 1 ; Chen, Xinwei 1 ; Hu, Xiaochun 1 ; Tu, Zhouyi 1 ; Wang, Qiuyi 1 ; Zhu, Yuxuan 1 ; Chen, Pengcheng 1 ; Bai, Zhenan 1 ; Liu, Tiangang 1 ; Zhang, Xuanwen 1 ; Qin, Peng 1 ; Wang, Kai 1 ; Jiang, Nan 1 ; Yang, Yuanzhu 1 ;
作者机构： 1.Yuan Longping High Tech Agr Co Ltd, Key Lab Southern Rice Innovat & Improvement, Minist Agr & Rural Affairs, Changsha 410128, Peoples R China
2.Yuan Longping High Tech Agr Co Ltd, Hunan Engn Lab Dis & Pest Resistant Rice Breeding, Changsha 410128, Peoples R China
3.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Peoples R China
4.Yuelushan Lab, Changsha 410128, Peoples R China
5.Hunan Normal Univ, Coll Life Sci, Changsha 410081, Peoples R China
6.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China
关键词：
期刊名称：JOURNAL OF FUNGI （ 影响因子：4.0； 五年影响因子：4.5 ）
ISSN：
年卷期： 2025 年 11 卷 7 期
页码：
收录情况： SCI
摘要： Rice blast disease, caused by the ascomycete fungus Magnaporthe oryzae (syn. Pyricularia oryzae), poses a severe threat to global rice production. Southern China, a major rice-growing region characterized by diverse agroecological conditions, faces substantial challenges from blast disease, yet our understanding of the genetic structure of M. oryzae populations in this region remains limited. Here, we analyzed 885 M. oryzae strains from 18 nurseries across four rice ecological regions in Southern China using a panel of genome-wide SNP markers. Phylogenetic and principal component analyses revealed three distinct clonal lineages: lineage I (58.19%), lineage II (21.36%), and lineage III (20.45%). Lineage I exhibited a broader geographic distribution compared to the other two lineages. Host-adapted divergence was observed across rice subspecies, with lineage III predominantly associated with japonica growing-regions, while lineages I and II mainly colonized indica rice-growing regions. Genetic diversity exhibited significant spatial heterogeneity, with the nucleotide diversity (pi) ranging from 0.17 in South China to 0.32 in the Middle-Lower Yangtze River region, reflecting differential cropping systems. The predominantly negative Tajima's D values across populations suggested recent expansion or selective sweeps, likely driven by host resistance pressures. High genetic differentiation between lineage I and other lineages contrasted with low divergence between lineages II and III, indicating distinct evolutionary trajectories. Furthermore, an uneven distribution of mating types among three genetic lineages was observed, suggesting limited sexual recombination within clonal lineages. The information obtained in this study may be beneficial in devising suitable strategies to control rice blast disease in Southern China.
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