Gibberellin transport affects lateral root growth through HY5 in response to far-red light.

ABSTRACT: Plants compete for light by growing taller than their nearest competitors. This is part of the shade avoidance syndrome and is a response to an increase in far-red (FR) light reflected from neighboring leaves. The root responds to this shoot-sensed FR cue by reducing lateral root emergence. It is well established that the phytohormone gibberellic acid (GA) is involved in supplemental FR-induced shoot elongation. Although GA is transported from shoot to root, its role in regulating lateral root growth is unclear. Here, we chemically and genetically manipulated GA and showed that GA modulates the lateral root reduction induced by shoot-sensed FR enrichment in Arabidopsis (Arabidopsis thaliana). Using the FRET-based GA biosensor GPS1 (GIBBERELLIN PERCEPTION SENSOR 1), we observed detailed GA

SUBMITTER: van Gelderen K 

PROVIDER: S-EPMC12448942 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature