DHAR — Beta vulgaris subsp. vulgaris

Summary

BvDHAR (BVRB_2G039390) on sugar beet chromosome 2 encodes a dehydroascorbate reductase, an enzyme with glutathione transferase and copper-binding activities. The gene is associated with ascorbate metabolism and the ascorbate-glutathione cycle, as well as cellular responses to hydrogen peroxide, ozone, jasmonic acid, zinc, and symbiotic fungi. It is linked to regulation of salicylic acid-mediated signaling, protein glutathionylation, and acquisition of seed longevity. Associations with photosynthetic rate, respiration rate, and tolerance to oxidative stress, drought, chilling injury, and photooxidative stress have been reported. The product localizes to multiple cellular compartments including the chloroplast, mitochondria, cytosol, apoplast, and vacuole. Studies of related genes in other species connect the family to ascorbic acid metabolism, drought and salt tolerance, and seed longevity.