SPL33, encoding an eEF1A-like protein, negatively regulates cell death and defense responses in rice

文献类型： 外文期刊

第一作者： Wang, Shuai

作者： Wang, Shuai;Lei, Cailin;Wang, Jiulin;Ma, Jian;Tang, Sha;Wang, Chunlian;Zhao, Kaijun;Tian, Peng;Qi, Changyan;Cheng, Zhijun;Zhang, Xin;Guo, Xiuping;Wu, Chuanyin;Wan, Jianmin;Zhang, Huan;Liu, Linglong;Wan, Jianmin

作者机构：

关键词： Defense responses;eukaryotic translation elongation factor 1 alpha (eEF1A);lesion-mimic mutant;Oryza sativa;programed cell death;SPL33

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN：

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收录情况： SCI

摘要： Lesion-mimic mutants are useful to dissect programmed cell death and defense-related pathways in plants. Here we identified a new rice lesion-mimic mutant, spotted leaf 33 (spl33) and cloned the causal gene by a map-based cloning strategy. SPL33 encodes a eukaryotic translation elongation factor 1 alpha (eEF1A)-like protein consisting of a nonfunctional zinc finger domain and three functional EF-Tu domains. spl33 exhibited programmed cell death-mediated cell death and early leaf senescence, as evidenced by analyses of four histochemical markers, namely H2O2 accumulation, cell death, callose accumulation and TUNEL-positive nuclei, and by four indicators, namely loss of chlorophyll, breakdown of chloroplasts, down-regulation of photosynthesis-related genes, and up-regulation of senescence-associated genes. Defense responses were induced in the spl33 mutant, as shown by enhanced resistance to both the fungal pathogen Magnaporthe oryzae and the bacterial pathogen Xanthomonas oryzae pv. oryzae and by up-regulation of defense response genes. Transcriptome analysis of the spl33 mutant and its wild type provided further evidence for the biological effects of loss of SPL33 function in cell death, leaf senescence and defense responses in rice. Detailed analyses showed that reactive oxygen species accumulation may be the cause of cell death in the spl33 mutant, whereas uncontrolled activation of multiple innate immunity-related receptor genes and signaling molecules may be responsible for the enhanced disease resistance observed in spl33. Thus, we have demonstrated involvement of an eEF1A-like protein in programmed cell death and provided a link to defense responses in rice.

分类号： Q94

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