Asymmetric distribution of cytokinins determines root hydrotropism in Arabidopsis thaliana.

ABSTRACT: The phenomenon of plant root tips sensing moisture gradient in soil and growing towards higher water potential is designated as root hydrotropism, which is critical for plants to survive when water is a limited factor. Molecular mechanisms regulating such a fundamental process, however, are largely unknown. Here we report our identification that cytokinins are key signaling molecules directing root growth orientation in a hydrostimulation (moisture gradient) condition. Lower water potential side of the root tip shows more cytokinin response relative to the higher water potential side. Consequently, two cytokinin downstream type-A response regulators, ARR16 and ARR17, were found to be up-regulated at the lower water potential side, causing increased cell division in the meristem zone, which

SUBMITTER: Chang J 

PROVIDER: S-EPMC6951336 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature