HY3 — Solanum tuberosum

Summary

StHY3 (PGSC0003DMG400017396) on potato chromosome 7 encodes a phytochrome protein, a member of the phytochrome A-E family that contains PAS, GAF, and histidine kinase domains. The gene is associated with tetrapyrrole binding and regulation of response to red or far-red light, as well as positive regulation of the phytochrome signaling pathway. StHY3 has been linked to numerous agronomic traits including grain yield, tuber size, photoperiod sensitivity, light quality response, chlorophyll ratio, plant dry weight, vegetative vigor, leaf area, flower diameter, and fruit set. It is also connected to phenotypes such as shoot regeneration, anthocyanin synthesis, nitrogen and potassium utilization, phosphorus deficiency tolerance, cold and drought stress responses, disease resistance, and heat shock tolerance. Studies of related genes in other species link the family to tuberization, fruit ripening, carotenoid accumulation, and biotic stress resistance.