Light promotes jasmonate biosynthesis to regulate photomorphogenesis in Arabidopsis  

作　　者：Rong Yi Jianbin Yan Daoxin Xie 

机构地区：[1]College of Life Sciences,Peking University,Beijing 100871,China [2]MOE Key Laboratory of Bioinformatics,Tsinghua-Peking Joint Center for Life Sciences,School of Life Sciences,Tsinghua University,Beijing 100084,China [3]Lingnan Guangdong Laboratory of Modern Agriculture,Genome Analysis Laboratory of the Ministry of Agriculture,Agricultural Genomics Institute at Shenzhen,Chinese Academy of Agricultural Sciences,Shenzhen 518124,China

出　　处：《Science China(Life Sciences)》2020年第7期943-952,共10页中国科学（生命科学英文版）

基　　金：supported by the National Key R&D Program of China (2016YFA0500501);National Natural Science Foundation of China (31630085)。

摘　　要：Light acts as the pivotal external environment cue to modulate plant growth and development. Seeds germinate in the soil without light to undergo skotomorphogenesis with rapidly elongating hypocotyls that facilitate emergence from the soil, while seedlings upon light exposure undergo photomorphogenesis with significantly inhibited hypocotyl elongation that benefits plants to stand up firmly and cope with the changing environment. In this study, we demonstrate that light promotes jasmonate(JA)biosynthesis to inhibit hypocotyl elongation and orchestrate seedling photomorphogenesis in Arabidopsis. We showed that JAinhibition on hypocotyl elongation is dependent on JA receptor COI1 and signaling components such as repressor proteins JAZs and transcription activators MYC2/MYC3/MYC4. Furthermore, we found that MYC2/MYC3/MYC4 activate the expression of photomorphogenesis regulator HY5 to repress cell elongation-related genes(such as SAUR62 and EXP2) essential for seedling photomorphogenesis. Our findings provide a novel insight into molecular mechanisms underlying how plants integrate light signal with hormone pathway to establish seedling photomorphogenesis.

关 键 词：PHOTOMORPHOGENESIS JASMONATE COI1 MYC2 HY5 hypocotyl elongation 

分 类 号：Q943.2[生物学—植物学]