AO — Triticum turgidum subsp. durum

Summary

TRITD5BV1G212660 (symbol AO, preferred name TtAO) on durum wheat chromosome 5B encodes an aldehyde oxidase/xanthine dehydrogenase a/b hammerhead domain-containing protein with abscisic aldehyde oxidase, aryl-aldehyde oxidase, xanthine dehydrogenase, and indole-3-acetaldehyde oxidase activities. The gene is associated with abscisic acid and auxin anabolism, carotenoid breakdown, glucosinolate metabolism, and responses to hydrogen peroxide and thirst. Its product localises to the plastid, cytosol, and nucleus. Associations include carotenoid content, photosynthetic rate, seed germination, seed dormancy, salt stress response, stomatal movement, leaf senescence, chlorophyll degradation, root elongation, and pathogen resistance. Studies of related genes in other species link the family to ABA biosynthesis, drought tolerance, stomatal closure, and water balance homeostasis, as well as grain, spikelet, and panicle traits.