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The Lesson Learned from the Unique Evolutionary Story of Avirulence Gene AvrPii of Magnaporthe oryzae

文献类型： 外文期刊

作者： Wang, Xing 1 ; Wu, Weihuai 1 ; Zhang, Yaling 1 ; Li, Cheng 1 ; Wang, Jinyan 1 ; Wen, Jianqiang 1 ; Zhang, Shulin 1 ; Yao, Yongxiang 1 ; Lu, Weisheng 1 ; Zhao, Zhenghong 6 ; Zhan, Jiasui 7 ; Pan, Qinghua 1 ;

作者机构： 1.South China Agr Univ, Rice Blast Res Ctr, Guangzhou 510642, Peoples R China

2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Hainan Key Lab Monitoring & Control Trop Agr Pests, Haikou 571101, Peoples R China

3.Heilongjiang Bayi Agr Univ, Coll Agron, Daqing 163319, Peoples R China

4.Anhui Agr Univ, Coll Plant Protect, Dept Plant Pathol, Hefei 230036, Peoples R China

5.Dandong Acad Agr Sci, Corn Res Inst, Dandong 118109, Peoples R China

6.Hunan Acad Agr Sci, Rice Res Inst, State Key Lab Hybrid Rice, Changsha 410125, Peoples R China

7.Swedish Univ Agr Sci, Dept Forest Mycol & Plant Pathol, S-75007 Uppsala, Sweden

关键词： Magnaporthe oryzae; avirulence gene; divergence; haplotype; population structure

期刊名称：GENES （ 影响因子：3.5； 五年影响因子：3.9 ）

ISSN：

年卷期： 2023 年 14 卷 5 期

页码：

收录情况： SCI

摘要： Blast, caused by Magnaporthe oryzae, is one of the most destructive diseases affecting rice production. Understanding population dynamics of the pathogen's avirulence genes is pre-required for breeding and then deploying new cultivars carrying promising resistance genes. The divergence and population structure of AvrPii was dissected in the populations of southern (Guangdong, Hunan, and Guizhou) and northern (Jilin, Liaoning, and Heilongjiang) China, via population genetic and evolutionary approaches. The evolutionary divergence between a known haplotype AvrPii-J and a novel one AvrPii-C was demonstrated by haplotype-specific amplicon-based sequencing and genetic transformation. The different avirulent performances of a set of seven haplotype-chimeric mutants suggested that the integrity of the full-length gene structures is crucial to express functionality of individual haplotypes. All the four combinations of phenotypes/genotypes were detected in the three southern populations, and only two in the northern three, suggesting that genic diversity in the southern region was higher than those in the northern one. The population structure of the AvrPii family was shaped by balancing, purifying, and positive selection pressures in the Chinese populations. The AvrPii-J was recognized as the wild type that emerged before rice domestication. Considering higher frequencies of avirulent isolates were detected in Hunan, Guizhou, and Liaoning, the cognate resistance gene Pii could be continuously used as a basic and critical resistance resource in such regions. The unique population structures of the AvrPii family found in China have significant implications for understanding how the AvrPii family has kept an artful balance and purity among its members (haplotypes) those keenly interact with Pii under gene-for-gene relationships. The lesson learned from case studies on the AvrPii family is that much attention should be paid to haplotype divergence of target gene.

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