VP2 — Oryza sativa Indica Group

Summary

BGIOSGA005419 (VP2, also known as OiCHALK5) 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, Golgi and endomembrane localisation, and is linked to proton transmembrane transport, auxin polar transport, cell wall pectin metabolism, sucrose metabolism, regulation of starch biosynthetic process, cold acclimation, salinity response, and response to abscisic acid. Observed associations include seedling cold tolerance, cadmium accumulation, and traits such as amylose content, grain length, grain size, chalkiness, leaf length, stomatal opening, heat tolerance, root growth, stamen and trichome development, and phosphate starvation tolerance. Studies of related genes in other species link the family to drought tolerance, salt tolerance, phosphorus use efficiency, vacuole acidification, and grain yield.