Ethylene - Hormone Synthetic Pathways and Genes in Arabidopsis

Ethylene is a gaseous hormone that has pleiotropic effects on plant development, such as leaf and flower senescence, fruit ripening, leaf abscission, and root hair growth. In Arabidopsis, seedling triple response (thickening and shortening of hypocotyl with pronounced apical hook) is a marker for ethylene action. The major ethylene biosynthesis pathway in Arabidopsis is shown here.