DHAR — Oryza sativa Indica Group

Summary

BGIOSGA021601 (symbol DHAR, also known as OiDHAR) on chromosome 6 of Indica rice encodes a dehydroascorbate reductase (EC 1.8.5.1) with glutathione transferase activity (EC 2.5.1.18) and belongs to the DHAR1/2/3/4 and glutathione S-transferase families. The enzyme is associated with the ascorbate–glutathione cycle, ascorbate metabolism, protein glutathionylation, cellular oxidant detoxification, and the cellular response to hydrogen peroxide. It is linked to the acquisition of seed longevity, positive regulation of salicylic acid-mediated signaling, and responses to jasmonic acid, ozone, zinc, and symbiotic fungi. The protein localizes to multiple compartments including the chloroplast envelope, stroma, apoplast, mitochondria, cytosol, and plastid. Associations with photosynthetic rate, chlorophyll content, stomatal resistance, and salt tolerance have been reported. Related genes in other species are linked to grain weight, panicle number, seed germination, drought tolerance, and aluminum tolerance.