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

ABSTRACT: 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 cell-elongation-related genes, but whether it is also involved in GA signaling to promote hypocotyl elongation is unknown. In this study, we show that promotion of hypocotyl elongation by GA is dependent on ABI4 activation. DELLAs interact directly with ABI4 and inhibit its

SUBMITTER: Xiong H 

PROVIDER: S-EPMC10504559 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature