UVR8-TCP4-LOX2 module regulates UV-B tolerance in Arabidopsis  

作　　者：Cheng Li Jiancan Du Huini Xu Zhenhua Feng Caspar CCChater Yuanwen Duan Yongping Yang Xudong Sun 

机构地区：[1]Yunnan Key Laboratory of Crop Wild Relatives Omics,The Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academyof Sciences,Kunming 650201,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]CAs Key Laboratory of Tropical Plant Resources and Sustainable Use,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Kunming 650223,China [4]Faculty of Life Science and Technology,Kunming University of Science and Technology,Kunming 650031,China [5]Royal Botanic Gardens,Kew,Richmond,Surrey TW93AE,UK

出　　处：《Journal of Integrative Plant Biology》2024年第5期897-908,共12页植物学报（英文版）

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research(STEP)program(2019QZKK0502);the National Natural Science Foundation of China(No.32370405).

摘　　要：The phytohormone jasmonate(JA)coordinates stress and growth responses to increase plant survival in unfavorable environments.Although JA can enhance plant UV-B stress tolerance,the mechanisms underlying the interaction of UV-B and JA in this response remain unknown.In this study,we demonstrate that the UV RESISTANCE LOCUS 8-TEOSINTE BRANCHED1,Cycloidea and PCF 4-LIPOXYGENASE2(UVR8-TCP4-LOX2)module regulates UV-B tolerance dependent on JA signaling pathway in Arabidopsis thaliana.We show that the nucleus-localized UVR8 physically interacts with TCP4 to increase the DNA-binding activity of TCP4 and upregulate the JA biosynthesis gene LOX2.Furthermore,UVR8 activates the expression of LOX2 in a TCP4-dependent manner.Our genetic analysis also provides evidence that TCP4 acts downstream of UVR8 and upstream of LOX2 to mediate plant responses to UV-B stress.Our results illustrate that the UV-B-dependent interaction of UVR8 and TCP4 serves as an important UVR8-TCP4-LOX2 module,which integrates UV-B radiation and JA signaling and represents a new UVR8 signaling mechanism in plants.

关 键 词：anthocyanin accumulation jasmonic acid TCP4 UV-B UVR8 

分 类 号：Q943.2[生物学—植物学]