DHAR — Phaseolus vulgaris

Summary

PHAVU_007G009800, designated PvDHAR, encodes a dehydroascorbate reductase with glutathione transferase and copper-binding activities, placing it in the DHAR1/2/3/4 family. In French bean (Phaseolus vulgaris) on chromosome 7, this gene is associated with ascorbate metabolism, the ascorbate-glutathione cycle, cellular oxidant detoxification, and responses to hydrogen peroxide, ozone, jasmonic acid, zinc, and symbiotic fungi. It is linked to regulation of symbiotic processes, salicylic acid-mediated signaling, protein glutathionylation, seed longevity acquisition, and chlorophyll fluorescence. The product localizes to the apoplast, chloroplast stroma, mitochondria, cytosol, nucleus, and plant-type vacuole. Associations with photosynthetic rate, transpiration rate, stomatal resistance, and chlorophyll content have been noted, as have connections to drought stress tolerance, oxidative stress tolerance, seed longevity, and antioxidative responses. Related genes in other species link the family to salicylic acid accumulation, glutathione and ascorbate redox states, and photooxidative stress tolerance.