The system that controls gene expression by the plant signaling molecule auxin has deep evolutionary roots, and stepwise increases in system complexity shaped the highly diverse auxin response in land plants.

Two protein kinases are required to activate auxin efflux transporters from plants.

Top-bottom patterning of leaves is not specified by an asymmetry in the distribution of the plant hormone auxin, in contrast to a previous proposal.

Auxin is produced in the endosperm after fertilization and drives the development of the seed coat in Arabidopsis.

Vacuolar morphologenesis correlates with cell size and is required for auxin-dependent inhibition of growth.

SWI/SNF chromatin remodeling complexes act as ‘gatekeepers’ for auxin responses and directly interact with the auxin response factor MONOPTEROS.

Comparative genetics between distant plant species shows that for the PIN auxin transport proteins differential membrane and tissue-level accumulation, transport activity, and interaction result in different functional properties in the shoot post transcription.

Conditional genetic inactivation of a highly conserved, ancestral subgroup of 14-3-3 proteins in Arabidopsis thaliana reveals fundamental roles in auxin transport-dependent plant development and post-Golgi trafficking processes.

The auxin-sensitive Aux/IAA transcriptional repressors regulate approximately 35% of the annotated genes in Physcomitrella patens and exhibit complex interactions with both the activating and repressing ARF transcription factors.

The nuclear pathway for auxin perception is responsible for the rapid auxin-induced cell wall acidification and growth of aerial organs of plants.