DHAR — Capsicum annuum

Summary

T459_33813 (DHAR) in pepper (Capsicum annuum) 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 the ascorbate-glutathione cycle, ascorbate metabolism, cellular oxidant detoxification, and positive regulation of salicylic acid-mediated signaling. It has been linked to traits including net photosynthetic rate, plant height, root volume, leaf water potential, stem diameter, and respiration rate, as well as phenotypes such as drought stress tolerance, chilling injury tolerance, oxidative stress tolerance, seed longevity, and antioxidant activity. The protein localizes to chloroplasts, mitochondria, cytosol, apoplast, and vacuole. Studies of related genes in other species connect the DHAR family to fruit ascorbate content, salt and high light stress tolerance, and seed longevity.