GA4 — Arabidopsis thaliana

Summary

AT1G15550 (GA4, also known as GA3OX1) encodes a gibberellin 3-beta-dioxygenase (EC 1.14.11.15), an iron/ascorbate-dependent oxidoreductase. In Arabidopsis, this gene is associated with seed germination, gibberellin A1 biosynthesis, and gibberellin metabolism. It has been linked to numerous traits including stem elongation, inflorescence length, silique and fruit development, petal and stamen morphology, trichome formation, leaf size, root length, hypocotyl elongation, flowering time, seed longevity and maturation, chlorophyll content, and starch breakdown. The protein localises to the cytoplasm and is also associated with thermomorphogenesis, organ growth, carpel development, and responses to red or far-red light. Studies of related genes in other species link the family to hypocotyl growth and sex expression.