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中国农学通报 ›› 2023, Vol. 39 ›› Issue (18): 117-122.doi: 10.11924/j.issn.1000-6850.casb2022-0755

• 生物科学 • 上一篇    下一篇

云南元江普通野生稻稻瘟病菌无毒基因鉴定与分析

董丽英1(), 刘沛1, 刘树芳1, 张先闻2, 杨勤忠1()   

  1. 1 云南省农业科学院农业环境资源研究所/云南省农业跨境有害生物绿色防控重点实验室,昆明 650205
    2 云南大学农学院,昆明 650504
  • 收稿日期:2022-09-05 修回日期:2022-11-15 出版日期:2023-06-25 发布日期:2023-06-25
  • 通讯作者: 杨勤忠,男,1970年出生,云南晋宁人,研究员,博士,研究方向:水稻稻瘟病抗性及病原菌致病性研究。通信地址:650205 昆明市北京路2238号,Tel:0871-65892205,E-mail:qzhyang@163.com
  • 作者简介:

    董丽英,女,1972年出生,云南昆明人,研究员,硕士,研究方向:水稻稻瘟病遗传分析与病原菌群体致病性研究。通信地址:650205 昆明市北京路2238号,Tel:0871-65892205,E-mail:

  • 基金资助:
    云南省重大科技专项计划“农业跨境病虫害绿色防控技术研究与推广应用”(202102AE090003); 云南省农业联合专项“大湄公河次区域水稻稻瘟病菌群体致病性分析”(202101BD070001-067)

Analysis and Identification of Avirulence Genes of Magnaporthe oryzae from Oryza rufipogon Griff. in Yuanjiang of Yunnan Province

DONG Liying1(), LIU Pei1, LIU Shufang1, ZHANG Xianwen2, YANG Qinzhong1()   

  1. 1 Institute of Agricultural Environment and 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 650504
  • Received:2022-09-05 Revised:2022-11-15 Online:2023-06-25 Published:2023-06-25

摘要:

为了明确分离自云南元江普通野生稻4个自然居群稻瘟病菌无毒基因的组成。以分离自元江普通野生稻上的52个单孢菌株和24个以丽江新团黑谷为背景的稻瘟病抗性单基因系为试材,用苗期喷雾接种的方法,对供试菌株进行无毒基因构成鉴定。结果显示,52个稻瘟病菌菌株组成的群体中,中等、弱和无致病力的菌株占比分别为34.69%、65.39%和1.92%,以弱致病力菌株占优势;52个菌株仅对含有Pi19PiiPi3PibPish等5个抗性单基因系具有强或中等毒性,对持有其余19个抗性基因的单基因系具有弱致病性或无致病性;根据供试菌株对24个水稻抗性单基因系的致病性分析,无毒基因的组成可分为10种类型。研究结论认为云南元江普通野生稻稻瘟病菌对24个水稻单基因系的致病性普遍偏弱,但仍存在致病性分化的现象。

关键词: 稻瘟病菌, 无毒基因, 致病性, 普通野生稻, 元江

Abstract:

In order to clarify the composition of avirulent genes of Magnaporthe oryzae strains isolated from four populations of Oryza rufipogon in Yuanjiang of Yunnan, pathogenicity of 52 single spore strains from O. rufipogon of Yuanjiang were determined on rice blast 24 monogenic lines, and the avirulent genes of these strains were identified by spraying inoculation method at seedling stage. The results showed that among 52 strains of M. oryzae, the proportion of medium, weak and non-pathogenic strains was 34.69%, 65.39% and 1.92% respectively, and the weak-pathogenic strains were dominant. The 52 strains showed the strong or moderate pathogenicity to only five resistant monogenic lines carrying Pi19, Pii, Pi3, Pib and Pish, respectively, and weak or non-pathogenicity to the remaining 19 monogenic lines. On the basis of pathogenicity determination of M. oryzae strains on 24 monogenic lines, the composition of avirulent genes could be divided into 10 types. M. oryzae strains from O. rufipogon in Yuanjiang of Yunan generally showed weak pathogenicity to 24 monogenic lines, but they still appeared pathogenicity differentiations.

Key words: Magnaporthe oryzae, avirulence gene, pathogenicity, Oryza rufipogon, Yuanjiang