OsPEX5 regulates rice spikelet development through modulating jasmonic acid biosynthesis

茉莉酸 生物合成 化学 生物化学 细胞生物学 生物 植物 基因
作者
Xiaoman You,Shanshan Zhu,Wenwei Zhang,Jie Zhang,Chunming Wang,Ruonan Jing,Weiwei Chen,Hongming Wu,Yuchen Cai,Zhiming Feng,Jinlong Hu,Haigang Yan,Fei Kong,Huan Zhang,Ming Zheng,Yulong Ren,Qian Lin,Zhijun Cheng,Xin Zhang,Cailin Lei,Ling Jiang,Haiyang Wang,Jianmin Wan
出处
期刊:New Phytologist [Wiley]
卷期号:224 (2): 712-724 被引量:40
标识
DOI:10.1111/nph.16037
摘要

Summary Spikelet is the primary reproductive structure and a critical determinant of grain yield in rice. The molecular mechanisms regulating rice spikelet development still remain largely unclear. Here, we report that mutations in Os PEX 5 , which encodes a peroxisomal targeting sequence 1 ( PTS 1) receptor protein, cause abnormal spikelet morphology. We show that Os PEX 5 can physically interact with Os OPR 7, an enzyme involved in jasmonic acid ( JA ) biosynthesis and is required for its import into peroxisome. Similar to Ospex5 mutant, the knockout mutant of Os OPR 7 generated via CRISPR ‐Cas9 technology has reduced levels of endogenous JA and also displays an abnormal spikelet phenotype. Application of exogenous JA can partially rescue the abnormal spikelet phenotype of Ospex5 and Osopr7 . Furthermore, we show that Os MYC 2 directly binds to the promoters of Os MADS 1 , Os MADS 7 and Os MADS 14 to activate their expression, and subsequently regulate spikelet development. Our results suggest that Os PEX 5 plays a critical role in regulating spikelet development through mediating peroxisomal import of Os OPR 7, therefore providing new insights into regulation of JA biosynthesis in plants and expanding our understanding of the biological role of JA in regulating rice reproduction.
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