AUR3 — Oryza sativa Japonica

Summary

OsAUR3 (AUR3, also known as GH3-2, FIN219, and PBS3) on rice chromosome 6 encodes a GH3 family protein with IAA amido synthetase, JA-amino synthetase, and adenylyltransferase activities. The gene is associated with defense responses, broad-spectrum disease resistance, and jasmonic acid conjugation. It is linked to abscisic acid and drought responses, as well as seed, crown root, root hair, and dwarf phenotypes. OsAUR3 is associated with cellular auxin homeostasis, jasmonic acid metabolism, and regulation of hormone anabolism. Localization evidence places the product in the cytosol, plasmalemma, chloroplast envelope, vacuole, and mitochondria. The gene is also associated with grain yield, panicle number, tiller angle, photoperiod-sensitive flowering, photosynthetic ability, and responses to red, far-red, and blue light. Studies of related genes in other species link the family to jasmonoyl-isoleucine biosynthesis and pathogen defense.