SPSC — Triticum aestivum

Summary

TaSPSC (TRAESCS4D02G088200) on wheat chromosome 4D encodes a sucrose-phosphate synthase (EC 2.4.1.14), an enzyme with sucrose-phosphate synthase activity that also exhibits sucrose synthase and transglycosidase activities. The protein contains SPS_C, SPS_pln, and glycosyltransferase domains. This gene is associated with the xanthophyll cycle, ascorbate-glutathione cycle, sucrose transport and anabolism, starch and cellulose metabolism, and regulation of carbohydrate metabolism. It localises to the cytosol and nucleus. TaSPSC is linked to numerous agronomic traits including grain yield, grain weight, grain number, grain volume, amylose and amylopectin content, starch and protein content, heading time, tiller number, leaf width, photosynthetic rate, water use efficiency, and tolerance to drought, heat, and stripe rust. Studies of related genes in other species link the family to embryo development, osmotic stress response, and spikelet number.