The DELLA-ABI4-HY5 module integrates light and gibberellin signals to regulate hypocotyl elongation  

作　　者：Haibo Xiong Dandan Lu Zhiyuan Li Jianghao Wu Xin Ning Weijun Lin Zechen Bai Canhui Zheng Yang Sun Wei Chi Lixin Zhang Xiumei Xu 

机构地区：[1]State Key Laboratory of Crop Stress Adaptation and Improvement,School of Life Sciences,Henan University,Jinming Avenue,Kaifeng 475004,China [2]Sanya Institute of Henan University,Sanya 572025,China [3]Photosynthesis Research Center,Key Laboratory of Photobiology,Institute of Botany,Chinese Academy of Sciences,Nanxincun 20,Xiangshan,Beijing 100093,China [4]Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China

出　　处：《Plant Communications》2023年第5期223-233,共11页植物通讯（英文）

基　　金：supported by the National Key Research and Development Program(2022YFF1001700,2020YFA0907600);the National Natural Sci-ence Foundation of China(31700204,32170258,U2004204);the Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City(2021JJLH0044);the Natural Science Foundation of Henan Province(222300420026);Central Plains Scholar(234000510005);the 111 Project(#D16014,Q.W.).

摘　　要：Plant growth is coordinately controlled by various environmental and hormonal signals,of which light and gibberellin(GA)signals are two critical factors with opposite effects on hypocotyl elongation.Although interactions between the light and GA signaling pathways have been studied extensively,the detailed regulatory mechanism of their direct crosstalk in hypocotyl elongation remains to be fully clarified.Previously,we reported that ABA INSENSITIVE 4(ABI4)controls hypocotyl elongation through its regulation of cellelongation-related genes,but whether it is also involved in GA signaling to promote hypocotyl elongation is unknown.In this study,we showthat promotion of hypocotyl elongation by GA is dependent on ABI4 activation.DELLAs interact directly with ABI4 and inhibit its DNA-binding activity.In turn,ABI4 combined with ELONGATED HYPOCOTYL 5(HY5),a key positive factor in light signaling,feedback regulates the expression of the GA2ox GA catabolism genes and thus modulates GA levels.Taken together,our results suggest that the DELLA-ABI4-HY5 module may serve as a molecular link that integrates GA and light signals to control hypocotyl elongation.

关 键 词：light signal GA signal hypocotyl elongation DELLA ABI4 HY5 

分 类 号：Q945[生物学—植物学]