VP2 — Oryza sativa Indica Group

Summary

BGIOSGA007004 (VP2, also known as OiCHALK5 and AVP1) in Indica rice encodes a proton-translocating pyrophosphatase (EC 7.1.3.1) belonging to the PPase-energised H-pump family, with additional annotated molecular functions including RNA folding chaperone, SUMO transferase, and kinase binding activities. The gene is associated with vacuolar and endomembrane localisation, proton transmembrane transport, auxin polar transport, cell wall pectin metabolism, and regulation of starch biosynthesis. Observed associations in rice include cold tolerance, cadmium accumulation, and seedling phenotypes. The gene has been linked to grain length, amylose content, chalkiness, leaf length, stomatal opening, and abscisic acid sensitivity. Related genes in other species are associated with salt, drought, and phosphorus deficiency tolerance, as well as root biomass and grain yield.