VP2 — Oryza sativa Indica Group

Summary

BGIOSGA006303 (VP2, also known as OiCHALK5, AVP1, and FUGU5) on Indica rice chromosome 2 encodes a PPase-energised H-pump with proton-translocating pyrophosphatase activity (EC 7.1.3.1). The gene is associated with vacuolar and endomembrane localisation, proton transmembrane transport, and the establishment of transmembrane electrochemical gradients. It has been linked to cold acclimation, salinity response, abscisic acid sensitivity, and cell wall pectin metabolism. Associations with agronomic traits include grain length, grain size, amylose content, chalkiness, leaf length, and stomatal opening. The gene is also linked to cadmium accumulation, heat tolerance, phosphate starvation tolerance, and root and shoot growth. Studies of related genes in other species connect the family to salt, drought, and low nitrogen stress tolerance, as well as vacuole acidification and phosphorus use efficiency.