PSY — Triticum aestivum

Summary

TRAESCS7A02G557300 (TaPSY, PSY-A1) on wheat chromosome 7A encodes a 15-cis-phytoene synthase, an enzyme with squalene/phytoene synthase and isoprenoid synthase domains (EC 2.5.1.32). The gene is associated with upregulation of carotenoid anabolism, carotene and isoprenoid biosynthesis, chromoplast organisation, de-etiolation, and protein stabilisation. It localises to plastids, including chloroplasts, etioplasts and chromoplast stroma. TaPSY is associated with grain yield, grain weight, flour colour, pericarp colour, alpha-carotene content, photosynthetic rate, chloroplast development, and stripe rust response. Related genes in other species are associated with beta-carotene, lutein, zeaxanthin and abscisic acid content, grain colour and size, drought and cold tolerance, and thermotolerance.