AFB1 controls rapid auxin signalling through membrane depolarization in Arabidopsis thaliana root.

ABSTRACT: The membrane potential reflects the difference between cytoplasmic and apoplastic electrical potentials and is essential for cellular operation. The application of the phytohormone auxin (3-indoleacetic acid (IAA)) causes instantaneous membrane depolarization in various cell types^1-6, making depolarization a hallmark of IAA-induced rapid responses. In root hairs, depolarization requires functional IAA transport and TIR1-AFB signalling⁵, but its physiological importance is not understood. Specifically in roots, auxin triggers rapid growth inhibition^7-9 (RGI), a process required for gravitropic bending. RGI is initiated by the TIR1-AFB co-receptors, with the AFB1 paralogue playing a crucial role^10,11. The nature of the underlying rapid signalling i

SUBMITTER: Serre NBC 

PROVIDER: S-EPMC7611683 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature