PHYB and PIF3 repress OLE4 expression to regulate hypocotyl length and ABA signaling in Arabidopsis.

ABSTRACT: OLEOSIN proteins (OLEs) are the predominant class of proteins localized on the surface of oil bodies. Previous studies have established that light facilitates the degradation of oil bodies via the action of PHOTOCHROME A/B (PHYA/B). However, the specific roles of OLEs in light signaling pathways and their underlying regulatory mechanisms remain unclear. In this study, we provide evidence that OLE4 inhibits hypocotyl elongation under red light conditions but has no significant effect in the dark. We demonstrated that red light suppressed both the expression and protein accumulation of OLE4. PHYB reduces OLE4 levels, moreover PHYTOCHROME INTERACTING FACTOR 3 (PIF3) directly represses OLE4 by binding to its G-box motifs; this repression is further strengthened by HDA5 and HDA6. Transcriptomic

SUBMITTER: Ji M 

PROVIDER: S-EPMC12742190 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature