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The wheat lesion mimic 34 mutant shows lesion mimicry and enhanced reactive oxygen species-mediated immunity to powdery mildew

文献类型： 外文期刊

作者： Fang, Yu 1 ; Liu, Sitong 1 ; Ding, Run 1 ; Guo, Feilong 1 ; Jiang, Hao 3 ; Wei, Jun 2 ; Yang, Yue 2 ; Han, Yi 1 ; Li, Yu 1 ; Gao, Lifeng 4 ; Cao, Hong 3 ; Liu, Yongxiu 1 ;

作者机构： 1.Chinese Acad Sci, Inst Bot, State Key Lab Forage Breeding Design & Utilizat, Beijing 100093, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Chinese Acad Sci, Inst Bot, Key Lab Plant Mol Physiol, Beijing 100093, Peoples R China

4.China Natl Bot Garden, Beijing 100093, Peoples R China

5.Chinese Acad Agr Sci, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Beijing 100081, Peoples R China

期刊名称：PLANT PHYSIOLOGY （ 影响因子：6.9； 五年影响因子：7.7 ）

ISSN： 0032-0889

年卷期： 2025 年 198 卷 4 期

页码：

收录情况： SCI

摘要： Lesion mimicry typically manifests as leaf disease-like symptoms in the absence of pathogen infection, characterized by a hypersensitive response, which is intricately linked to plant disease resistance. In this study, the wheat (Triticum aestivum L.) mutant lesion mimic 34 (lm34), harboring a recessive mutation in the Zhongyou 206 (ZY206) background, was comprehensively investigated. The lm34 mutation was mapped to a 140-kb region on chromosome 4AL through bulked segregant exome capture sequencing and fine-mapping. Sequence comparison and phenotypic analysis of the lm34Jing mutant revealed that TraesCS4A03G1225400, encoding a typical coiled coil-nucleotide-binding-leucine-rich repeat protein, is the causal gene in lm34. Transient expression assays in Nicotiana benthamiana leaves indicated that the TaLM34 extended coiled coil domain can induce cell death. Furthermore, lm34 mutants display elevated reactive oxygen species levels and significantly increased expression of pathogenesis-related (PR) genes (PR2 and PR10), leading to enhanced powdery mildew resistance. Our findings suggest that TaLM34 can serve as a potential target for the development of wheat cultivars with improved disease resistance. Overall, our study sheds light on the molecular mechanisms underlying wheat disease resistance and cell death. Wheat LESION MIMIC 34 enhances powdery mildew resistance by triggering cell death and activating defense-related pathways.

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