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Disruption of LEAF LESION MIMIC 4 affects ABA synthesis and ROS accumulation in rice

文献类型： 外文期刊

作者： Wu, Hao 1 ; Dai, Gaoxing 2 ; Yuchun, Rao 4 ; Wu, Kaixiong 3 ; Wang, Junge 3 ; Hu, Peng 3 ; Wen, Yi 3 ; Wang, Yueying 3 ; Zhu, Lixin 3 ; Chai, Bingze 3 ; Liu, Jialong 3 ; Deng, Guofu 2 ; Qian, Qian 1 ; Hu, Jiang 3 ;

作者机构： 1.Zhejiang Univ, Coll Agr & Biotechnol, Dept Agron, Hangzhou 310058, Zhejiang, Peoples R China

2.Guangxi Acad Agr Sci, Guangxi Crop Genet Improvement & Biotechnol Lab, Nanning 530007, Guangxi, Peoples R China

3.China Natl Rice Res Inst, State Key Lab Rice Biol & Breeding, Hangzhou 310006, Zhejiang, Peoples R China

4.Zhejiang Normal Univ, Coll Life Sci, Jinhua 321004, Zhejiang, Peoples R China

关键词： Rice; Lesion mimic; Reactive oxygen species; Programmed cell death; Zeaxanthin epoxidase; Xanthophyll cycle; Carotenoid; Abscisic acid

期刊名称：CROP JOURNAL （ 影响因子：6.6； 五年影响因子：6.5 ）

ISSN： 2095-5421

年卷期： 2023 年 11 卷 5 期

页码：

收录情况： SCI

摘要： Lesion mimic mutants (LMMs) are advantageous materials for studying programmed cell death (PCD). Although some rice LMM genes have been cloned, the diversity of functions of these genes indicates that the mechanism of cell death regulation in LMMs needs further study. In this study, we identified a rice light-dependent leaf lesion mimic mutant 4 (llm4) that showed abnormal chloroplast structure, photoin-hibition, reduced photosynthetic protein levels, massive accumulation of reactive oxygen species (ROS), and PCD. Map-based cloning and complementation testing revealed that LLM4 encodes zeaxanthin epoxidase (ZEP), an enzyme involved in the xanthophyll cycle, which functions in plant photoprotection, ROS scavenging, and carotenoid and abscisic acid (ABA) biosynthesis. The ABA content was decreased, and the contents of 24 carotenoids differed between the llm4 mutant and the wild type (WT). The llm4 mutant showed reduced dormancy and greater sensitive to ABA than the WT. We concluded that the mutation of LLM4 resulted in the failure of xanthophyll cycle, in turn causing ROS accumulation. The excessive ROS accumulation damaged chloroplast structure and induced PCD, leading eventually to the formation of lesion mimics.(c) 2023 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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