DHAR — Lactuca sativa

Summary

LsDHAR, encoded by gene LSAT_V11C800396070 on lettuce chromosome 8, is a dehydroascorbate reductase (DHAR) belonging to the glutathione S-transferase superfamily, with dehydroascorbate reductase, glutathione transferase, glutathione binding and copper binding activities. In lettuce, LsDHAR is associated with ascorbate metabolism, the ascorbate-glutathione cycle, cellular oxidant detoxification, photoprotection, chlorophyll fluorescence, and responses to hydrogen peroxide, ozone, jasmonic acid, zinc, and symbiotic fungi, as well as positive regulation of salicylic acid-mediated signaling and seed longevity acquisition. The gene is linked to multiple agronomic traits including photosynthetic rate, transpiration rate, stomatal resistance, respiration rate, root and shoot fresh and dry weight, nitrate and sugar content. Studies of related DHAR family members in other species connect the family to drought, chilling, photooxidative and salt stress tolerance, seed longevity, ascorbate and glutathione redox state, and mutualistic interactions with Piriformospora indica.