DHAR — Solanum lycopersicum

Summary

SlDHAR, the tomato gene on chromosome 11, encodes a dehydroascorbate reductase, an enzyme with dehydroascorbate reductase, glutathione transferase, glutathione binding and copper binding activities, belonging to the DHAR1/2/3/4 and glutathione S-transferase families. The protein localises to multiple cellular compartments including the chloroplast, mitochondria, cytosol, apoplast and plasmalemma. SlDHAR is associated with the ascorbate-glutathione cycle, xanthophyll cycle, ascorbate and glutathione metabolism, protein glutathionylation, and responses to stimuli such as K+ ions and salicylic acid signalling. In tomato, the DHAR5 variant has been linked to salt stress tolerance. The gene is also associated with numerous agronomic traits, including fruit weight, firmness, colour, lycopene and carotenoid content, leaf chlorophyll content, photosynthetic rate, water use efficiency, biomass yield, and root and shoot growth parameters.