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

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外文摘要：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 biosyn-thesis gene LOX2.Furthermore,UVR8 activates the expression of LOX2 in a TCP4-dependent manner.Our genetic analysis also provides evi-dence 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.

外文关键词：

anthocyanin accumulationjasmonic acidTCP4UV-BUVR8

作者：

Cheng Li、Jiancan Du、Huini Xu、Zhenhua Feng、Caspar C.C.Chater、Yuanwen Duan、Yongping Yang、Xudong Sun

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作者单位：

Yunnan Key Laboratory of Crop Wild Relatives Omics,The Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China

University of Chinese Academy of Sciences,Beijing 100049,China

CAS Key Laboratory of Tropical Plant Resources and Sustainable Use,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Kunming 650223,China

Faculty of Life Science and Technology,Kunming University of Science and Technology,Kunming 650031,China

Royal Botanic Gardens,Kew,Richmond,Surrey TW9 3AE,UK

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基金：

Second Tibetan Plateau Scientific Expedition and Research(STEP)programNational Natural Science Foundation of China

项目编号：

2019QZKK050232370405

出版年：

2024

DOI：

10.1111/jipb.13648

植物学报(英文版)