CPGI — Zea mays

Summary

ZM00001EB059230 (ZmCPGI, also known as CPGI, PGI1, or PGI2) on maize chromosome 1 encodes a glucose-6-phosphate isomerase (EC 5.3.1.9) with monosaccharide and carbohydrate derivative binding activity, belonging to the phosphoglucose isomerase family. The enzyme catalyzes the interconversion of glucose-6-phosphate and fructose-6-phosphate in cytosolic glycolysis and carbohydrate metabolism. ZmCPGI is associated with plastid and cytoplasmic localization, and is linked to C4 photosynthesis, starch and amylopectin metabolism, sucrose breakdown, and aerenchyma formation. Agronomically, the gene is associated with grain weight and yield, seed weight, starch and amylose content, soluble protein content, anthesis-silking interval, root branching and length, transpiration rate, stomatal resistance, drought tolerance, and heterosis. Studies of related genes in other species link the family to pollen development, male fertility, grain size, and starch accumulation.