SEUSS and PIF4 Coordinately Regulate Light and Temperature Signaling Pathways to Control Plant Growth

作     者：Junling Huai Xinyu Zhang dialong Li Tingting Ma Ping Zha Yanjun Jing Rongcheng Lin Junling Huai;Xinyu Zhang;Jialong Li;Tingting Ma;Ping Zha;Yanjun Jing[1 and Rongcheng Lin1,2,3]

作者机构：Key Laboratory of Photobiology Institute of Botany Chinese Academy of Sciences Beijing 100093 China University of Chinese Academy of Sciences Beijing 100049 China GAS Center for Excellence in Molecular Plant Sciences Chinese Academy of Sciences Beijing 100093 China These authors contribute equally to this article. 

出 版 物：《Molecular Plant》 (分子植物（英文版）)

年 卷 期：2018年第11卷第7期

页      面：928-942页

核心收录：

学科分类：090403[农学-农药学(可授农学、理学学位）] 08[工学] 09[农学] 0904[农学-植物保护] 0835[工学-软件工程] 081202[工学-计算机软件与理论] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by grants from the Ministry of Agriculture of China to R.L the National Key Research and Development Program of China to Y.J the National Natural Science Foundation of China to R.L 

主　　题：light temperature SEU PIF4 transcription regulation 

摘      要：Plants continuously monitor environmental conditions （such as light and temperature） and adjust their growth and development accordingly. The transcription factor PHYTOCHROME-INTERACTING FACTOR4 （PIF4） regulates both light and temperature signaling pathways. Here, we identified ENHANCED PHOTOMORPHOGENIC2 （EPP2） as a new repressor of photomorphogenesis in red, far-red, and blue light. Map-based cloning revealed that EPP2 encodes the SEUSS （SEU） transcription regulator. The C terminus of SEU has transcriptional activation activity, and SEU physically interacts with PIF4. Moreover, SEU promotes the expression of many genes, including auxin biosynthetic and responsive genes, and regulates IAA levels in plants. SEU associates with the regulatory regions of INDOLE-3-ACETIC ACID INDUCIBLE6 （IAA6） and IAA 19 in a PIF4-independent manner, whereas the binding of PIF4to these genes requires SEU. Furthermore, muta- tions in SEU affect H3K4me3 methylation at IAA6 and IAA 19, and SEU positively regulates warm temperature- mediated hypocotyl growth together with PIF4. Collectively, our results reveal that SEU acts as a central regulator integrating light and temperature signals to control plant growth by coordinating with PIF4.