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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (12): 123-130.doi: 10.11924/j.issn.1000-6850.casb2022-0399

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SSR Analysis of Population Genetic Structure of Magnaporthe oryzae from Different Rice-growing Regions in Yunnan

LIU Shufang1(), ZHANG Xianwen1,2, DONG Liying1, LIU Pei1, TIAN Weikui3, ZHOU Wumin1,2, YANG Qinzhong1()   

  1. 1 Institute of Agricultural Environment Resource Research, Yunnan Academy of Agricultural Sciences/Key Laboratory of Green Prevention and Control of Agricultural Transboundary Pest of Yunnan Province, Kunming 650205
    2 School of Agriculture, Yunnan University, Kunming 650091
    3 Plant Protection and Quarantine & Soil Fertilizer Workstation of Menghai County, Jinghong, Yunnan 666200
  • Received:2022-05-18 Revised:2022-06-30 Online:2023-04-25 Published:2023-04-21

Abstract:

In order to understand the population genetic structure of Magnaporthe oryzae, total genomic DNA of 125 strains of M. oryzae collected from upland rice, indica paddy rice and japonica paddy rice growing regions in 13 prefectures of Yunnan Province during 2007-2013 was amplified and analyzed by PCR with thirteen SSR markers. A total of 128 alleles were detected by 13 pairs of primers. Cluster analysis showed that the 125 tested strains could be divided into 29 genetic genealogies when the similarity coefficient was 0.57. The dominant genealogy YN02 contained 39 strains, accounting for 31.20% of total strains, the secondary dominant genealogy YN08 contained 15 strains, accounting for 12.00% of the total strains, and the other 71 strains belonged to 27 genealogies. The results showed that there were both dominant genealogy and small genealogy with more genetic diversity in Yunnan, indicating rich genetic diversity of M. oryzae population. Comparison of the genealogical frequencies of the strains from different rice growing regions showed that the genealogical frequencies of strains from upland rice, japonica rice and indica rice growing regions were 65.52%, 27.59% and 13.79%, respectively, indicating that the genetic structure of the strains in upland rice growing region was more complex than that in japonica and indica rice growing regions. Therefore, diversified rice varieties should be planted in the regions where there are few genealogies and dominant genealogies, and this practice is conducive to the stabilizing selection of rice blast population and reducing the risk of disease epidemic.

Key words: Oryza sativa L., Magnaporthe oryzae, SSR markers, genetic structure, genealogy