A molecular basis for auxin action

The plant hormone auxin is central in the regulation of growth and developm ent, however, the molecular basis for its action has remained enigmatic. In the absence of a molecular model, the wide range of responses elicited by auxin have been difficult to explain. Recent advances using molecular genet ic approaches in Arabidopsis have led to the isolation of a number of Key g enes involved in auxin action. Of particular importance are genes involved in channelling polar auxin transport through the plant. In addition a model for auxin signal transduction, centred on regulated protein degradation, h as been developed.