HY3 — Solanum tuberosum

Summary

PGSC0003DMG400024017 (HY3, PHYB) on potato chromosome 1 encodes a phytochrome B photoreceptor, a member of the phytochrome A-E family with domains including GAF, PAS, and histidine kinase. The gene is associated with tetrapyrrole binding and regulation of responses to red or far-red light, as well as positive regulation of the phytochrome signaling pathway. It is linked to photoperiod sensitivity, far-red and blue light sensitivity, and light quality response. Associations include tuberization, flowering under drought stress, and drought escape via an ABA-dependent pathway. The gene is connected to traits such as grain yield, plant dry weight, leaf area, chlorophyll ratio, panicle number, flower diameter, branch angle, and vegetative vigor. It is also associated with phenotypes including shoot regeneration, anthocyanin synthesis, cold and drought stress responses, disease resistance, and carbon assimilation. Studies of related genes in other species link the family to fruit ripening, lycopene accumulation, photoperiod detection, and salinity tolerance.