A BRC1-modulated switch in auxin efflux accounts for the competition between Arabidopsis axillary buds.

ABSTRACT: As part of their modular development, plants continuously adapt their shoot branching architecture according to environmental conditions. This occurs by regulating the activity of axillary buds established in each leaf axil. Whether a bud grows into a shoot depends partly on the presence of other active shoots, which can inhibit bud activation. This systemic coordination is proposed to be mediated by the transport network of the plant hormone auxin, with buds competing to establish sustained transport of auxin, termed canalized auxin transport, into the main stem. A second hormone, strigolactone, tunes this competition by influencing the removal of the PIN1 auxin export protein from the plasma membrane, and hence the dynamics of canalization. Strigolactone also regulates the expression of

SUBMITTER: Nahas Z 

PROVIDER: S-EPMC12456834 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature