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中国农学通报 ›› 2022, Vol. 38 ›› Issue (21): 112-121.doi: 10.11924/j.issn.1000-6850.casb2021-1080

所属专题: 生物技术 植物保护 水稻

• 植物保护·农药 • 上一篇    下一篇

鄂西南地区稻瘟病菌AVR-Pia动态变化研究

韩旭晨(), 董岩, 韩豪杰, 谭艳平, 刘学群, 刘新琼, 徐鑫, 李开, 王春台()   

  1. 中南民族大学生命科学学院/生物技术国家民委重点实验室/武陵山区特色资源植物种质保护与利用湖北省重点实验室,武汉 430074
  • 收稿日期:2021-11-11 修回日期:2022-02-05 出版日期:2022-07-25 发布日期:2022-08-23
  • 通讯作者: 王春台
  • 作者简介:韩旭晨,男,1996年出生,河南安阳人,在读硕士研究生,研究方向:鄂西南稻瘟病菌群体遗传研究。通信地址:430074 湖北省武汉市洪山区182号 中南民族大学生命科学学院,Tel:027-67843239,E-mail: 1033719683@qq.com
  • 基金资助:
    湖北省自然科学基金重点项目“武陵山区稻瘟病菌小种流行演替与抗病育种”(2015CFA015);2019中央科研业务费“鄂西南2019年稻瘟病的调查及病原菌的收集”(CZY19036)

Study on Dynamic Changes of AVR-Pia of Magnaporthe grisea in Southwestern Hubei

HAN Xuchen(), DONG Yan, HAN Haojie, TAN Yanping, LIU Xuequn, LIU Xinqiong, XU Xin, LI Kai, WANG Chuntai()   

  1. College of Life Science/Key Laboratory of State Ethnic Affairs Commission for Biological Technology/Hubei Provincial Key Laboratory for Protection and Application of Special Plants in Wuling Area of China/South-Central Minzu University, Wuhan 430074
  • Received:2021-11-11 Revised:2022-02-05 Online:2022-07-25 Published:2022-08-23
  • Contact: WANG Chuntai

摘要:

为了解鄂西南地区稻瘟病菌AVR-Pia的分布和动态变化,于2017—2020年在鄂西南9个地点同时种植特定100个水稻品种,采集感病稻杆并分离稻瘟病菌;利用水稻单基因系IRBLa-A进行致病性鉴定,设计无毒基因AVR-Pia特异性引物进行PCR扩增和序列分析。结果表明2017—2020年分离保存的661株稻瘟病菌菌株中,有49株含有无毒基因AVR-Pia(占7.4%),不同年份及不同地点AVR-Pia出现频率差异明显,2017—2020年分别为7.5%、16.0%、3.1%、5.0%,AVR-Pia出现频率最高的是野三关(15.8%),其次是柏杨和来凤(都是14.6%),咸丰、建始和太平未出现。含Pia的单基因系IRBLa-A对其中91个菌株(13.8%)具有抗性。49个菌株能扩增出463 bp的特异性条带,序列分析发现其CDS区域未发现突变,起始密码子上游109 bp位点发生碱基突变G/T,该位点变异是否与表达相关有待进一步研究。说明鄂西南地区无毒基因AVR-Pia存在较少,抗性基因Pia不适合在鄂西南地区作为主效抗病基因来选择育种。

关键词: 稻瘟病菌, AVR-Pia, 动态变化, 鄂西南地区, 变异机理

Abstract:

In order to understand the distribution and dynamic changes of AVR-Pia of Magnaporthe grisea in southwestern Hubei, 100 specific rice varieties were simultaneously planted in 9 locations in southwestern Hubei from 2017 to 2020, and the susceptible rice straws were collected to isolate monospore. We used the rice monogenic line IRBLa-A for pathogenicity identification, and designed specific primers for the avirulent gene AVR-Pia for PCR amplifying and sequence analyzing. The results showed that among the 661 isolates of Magnaporthe grisea isolated from 2017 to 2020, 49 isolates (7.4%) contained avirulent gene AVR-Pia. The frequencies of AVR-Pia were different significantly in different years and locations. From 2017 to 2020, the frequency of AVR-Pia was 7.5%, 16.0%, 3.1% and 5.0%, respectively. The location with the highest frequency of AVR-Pia was Yesanguan (15.8%), followed by Baiyang and Laifeng (both 14.6%), and no AVR-Pia was observed in Xianfeng, Jianshi and Taiping. The monogenic line IRBLa-A with Pia was resistant to 91 of the 661 isolates (13.8%). There were 49 isolates with 463 bp specific band of AVR-Pia, and no mutation was found in the CDS region through sequence analysis, but a base mutation G/T occurred at the 109 bp upstream of the start codon. Whether this point mution was related to expression needs further study. These results indicate that the avirulent gene AVR-Pia is less in southwestern Hubei, and the resistance gene Pia is not suitable for selective breeding as a major disease resistance gene in this region.

Key words: Magnaporthe grisea, AVR-Pia, dynamic changes, southwestern Hubei, variation mechanism

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