DHAR — Solanum tuberosum

Summary

PGSC0003DMG400023416 (DHAR) on potato chromosome 5 encodes a dehydroascorbate reductase with glutathione transferase activity, belonging to the DHAR1/2/3/4 family. This enzyme is associated with ascorbate metabolism and the ascorbate-glutathione cycle, as well as protein glutathionylation, S-nitrosylation, and cellular oxidant detoxification. It is linked to responses to hydrogen peroxide, ozone, jasmonic acid, zinc, and symbiotic fungi, and to positive regulation of salicylic acid-mediated signaling. The protein localizes to the chloroplast envelope, stroma, apoplast, vacuole, plastid, mitochondria, and cytosol. Associations include traits such as photosynthetic rate, water use efficiency, chlorophyll content, plant height, and respiration rate, as well as phenotypes including oxidative and drought stress tolerance, seed longevity, chilling injury tolerance, and ascorbic acid content. Studies of related genes in other species link the family to drought and high light stress tolerance, and to salt stress tolerance.