DHAR — Solanum tuberosum

Summary

PGSC0003DMG400015691 (DHAR) on potato chromosome 11 encodes a dehydroascorbate reductase (EC 1.8.5.1) with glutathione transferase activity (EC 2.5.1.18), belonging to the DHAR1/2/3/4 and glutathione S-transferase families. The enzyme is associated with ascorbate metabolism, the ascorbate-glutathione cycle, cell redox homeostasis, photoprotection, cellular respiration, and responses to hydrogen peroxide, ozone, and zinc. It has been linked to traits including photosynthetic rate, water use efficiency, quantum yield, respiration rate, germination rate, root length, and abscisic acid content. Phenotypic associations include oxidative stress tolerance, drought stress tolerance, chilling injury tolerance, seed longevity, and mutualistic interaction with Piriformospora indica. The protein localises to the chloroplast envelope and stroma, mitochondria, cytosol, apoplast, plasmalemma, and plant-type vacuole. Studies of related genes in other species link the family to drought tolerance and high light stress tolerance, while related genes in other species have been connected to salt stress tolerance.