Unraveling the Dynamic Integration of Auxin, Brassinosteroid and Gibberellin in Early Shade-Induced Hypocotyl Elongation.

ABSTRACT: For shade-intolerant plants, a reduction in the red/far-red (R:FR) light ratio signals the close proximity of competitors and triggers shade-avoidance syndrome (SAS). Auxin, brassinosteroid, gibberellin and some transcriptional regulators have been reported to regulate shade-induced hypocotyl elongation. However, little is understood regarding the coordination of these multiple regulatory pathways. Here, combining time-lapse growth rates and transcriptomic data, we demonstrate that auxin and brassinosteroid affect two phases of shade-induced rapid growth, whereas gibberellin mainly contributes to the second rapid growth phase. PHYTOCHROME-INTERACTING FACTOR 7 (PIF7) acts earlier than other PIFs. PIF4 and PIF5 modulate the second rapid growth phase. LONG HYPOCOTYL IN FAR-RED 1 (HFR1) and PI

SUBMITTER: Huang S 

PROVIDER: S-EPMC9590496 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature