ARF5/MONOPTEROS directly regulates miR390 expression in the Arabidopsis thaliana primary root meristem.

ABSTRACT: The root meristem is organized around a quiescent center (QC) surrounded by stem cells that generate all cell types of the root. In the transit-amplifying compartment, progeny of stem cells further divides prior to differentiation. Auxin controls the size of this transit-amplifying compartment via auxin response factors (ARFs) that interact with auxin response elements (AuxREs) in the promoter of their targets. The microRNA miR390 regulates abundance of ARF2, ARF3, and ARF4 by triggering the production of trans-acting (ta)-siRNA from the TAS3 precursor. This miR390/TAS3/ARF regulatory module confers sensitivity and robustness to auxin responses in diverse developmental contexts and organisms. Here, we show that miR390 is expressed in the transit-amplifying compartment of the root me

SUBMITTER: Dastidar MG 

PROVIDER: S-EPMC6508847 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature