AOS — Triticum aestivum

Summary

TRAESCS5B02G408000 (symbol AOS, also known as TaAOS1-5B, TaCYP74A-5B or TaDDE2-5B) on bread wheat chromosome 5B encodes a cytochrome P450 enzyme with allene oxide synthase, colneleate synthase, allene-oxide cyclase and hydro-lyase activities. The gene is associated with oxylipin and fatty acid metabolism, the lipoxygenase and epoxygenase P450 pathways, hormone metabolism, and the stress-activated MAPK cascade. It has been linked to defense responses including callose deposition, systemic acquired resistance, detection of biotic stimulus, and regulation of hydrogen peroxide metabolism, as well as to regulation of apoptotic process and downregulation of growth. Associations with grain yield, test weight, grain protein, iron and zinc content, stem rust, drought sensitivity, net photosynthetic rate, jasmonic acid content, and plant vigor have been reported. The protein localises to the chloroplast thylakoid membrane and plastid envelope.