Rapid and reversible root growth inhibition by TIR1 auxin signalling.

ABSTRACT: The phytohormone auxin is the information carrier in a plethora of developmental and physiological processes in plants¹. It has been firmly established that canonical, nuclear auxin signalling acts through regulation of gene transcription². Here, we combined microfluidics, live imaging, genetic engineering and computational modelling to reanalyse the classical case of root growth inhibition³ by auxin. We show that Arabidopsis roots react to addition and removal of auxin by extremely rapid adaptation of growth rate. This process requires intracellular auxin perception but not transcriptional reprogramming. The formation of the canonical TIR1/AFB-Aux/IAA co-receptor complex is required for the growth regulation, hinting to a novel, non-transcriptional branch

SUBMITTER: Fendrych M 

PROVIDER: S-EPMC6104345 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature