PHO2 — Triticum turgidum subsp. durum

Summary

TRITD3BV1G205620, designated TtPHO2 (also known as PHS2 or PHO2) on durum wheat chromosome 3B, encodes a protein with 1,4-alpha-oligoglucan phosphorylase activity (EC 2.4.1.1), pyridoxal phosphate binding, and transglycosidase activity, and is a member of the glycosyltransferase family 35. The gene product localizes to the amyloplast and cytosol and is associated with glycogenolysis and seed development. TtPHO2 has been linked to reproductive period, senescence, low light tolerance, and hypocotyl extension. Studies of the Arabidopsis relative PHS2 connect the family to maltose metabolism, while research in rice links it to phosphate use efficiency. Sequence similarity further associates the family with agronomically important traits including grain weight, grain yield, plant height, anthesis time, drought tolerance, chlorophyll content, root length, stem diameter, and phosphorus uptake.