PHO2 — Triticum turgidum subsp. durum

Summary

TRITD3AV1G223380, designated TtPHO2 (also known as PHS2), encodes a glycogen phosphorylase (EC 2.4.1.1) with 1,4-alpha-oligoglucan phosphorylase activity, pyridoxal phosphate binding, and transglycosidase activity. The protein belongs to the Glyco_trans_35 and glycogen phosphorylase families. It is associated with glycogenolysis, seed development, and response to thirst, and localizes to the amyloplast, cytosol, and cytoplasm. TtPHO2 is linked to reproductive period, senescence, low light tolerance, and hypocotyl extension. Studies of the Arabidopsis relative PHS2 connect the family to maltose metabolism, while sequence similarity in rice links it to phosphate use efficiency. Broader family associations include grain weight, grain yield, plant height, anthesis time, drought tolerance, chlorophyll content, root length, stem diameter, and phosphorus uptake.