Exhibits glutathione-dependent thiol transferase activities. Can use glutathione (GSH) and 1-chloro-2,4-dinitrobenzene (CDNB) as substrates. Involved in the regulation of far-red light influence on development (PubMed:17220357). Regulator of the interplay between light and JA signaling by increasing JAR1/FIN219 efficiency (PubMed:28223489). Maybe involved in gravitropic signal transduction (Probable). glutathione + RX = a halide anion + an S-substituted glutathione + H(+) Activated by JAR1/FIN219. Homodimerization. Interacts with JAR1/FIN219 under continuous far red (cFR) light to stimulate JAR1/FIN219 activity and substrate selectivity. Mostly associated with vascular tissues, especially near hydathodes. Light-dependent expression. Developmentally regulated. First observed in cotyledon vascular tissues of young seedlings. Appears at the shoot apex, in the upper part of hypocotyls and in roots in one week old seedlings. Later highly expressed in the basal portion of trichomes, veins, shoot apex, and hypocotyls. Becomes restricted to the margins of leaves and in roots. In drakness and blue light (B) grown plants, localized in cotyledons vascular tissues. In far-red (FR) and red (R) light conditions, mostly confined to regions of vascular tissues near the hydathode of cotyledons. In adult plants, expressed in vascular tissues of flower organs. Induced by a gravistimulation. Hyposensitive hypocotyl phenotype under continuous far red (cFR) light and a delayed flowering phenotype under long-day conditions. Belongs to the GST superfamily. Tau family.