Displays a dual function. As a soluble protein, exhibits glutathione-dependent thiol transferase and dehydroascorbate (DHA) reductase activities (PubMed:12077129). Key component of the ascorbate recycling system. Involved in the redox homeostasis, especially in scavenging of ROS under oxidative stresses (By similarity). glutathione + RX = a halide anion + an S-substituted glutathione + H(+) 2 glutathione + L-dehydroascorbate = glutathione disulfide + L-ascorbate Monomer (By similarity). Interacts with TRX3. Partial S-glutathionylation and intramolecular disulfide bond formation between Cys-66 and Cys-69 in the presence of oxidized glutathione (GSSG). Could be reduced by TRX-dependent process. Belongs to the GST superfamily. DHAR family. The predicted gene has been split into 2 genes: At5g16710 and At5g16715.