HY3 — Lactuca sativa

Summary

LsHY3 (HY3) on chromosome 7 of garden lettuce encodes a protein with domains characteristic of phytochrome photoreceptors, including a GAF domain, PAS domains, and a histidine kinase domain. The gene is associated with tetrapyrrole binding and has been linked to the regulation of response to red or far red light, positive regulation of phytochrome signaling, detection of light, and protein-phycocyanobilin linkage. Associations include traits such as light quality response, far red light sensitivity, photoperiod sensitivity, chlorophyll ratio, leaf area, plant dry weight, grain yield, and vegetative vigor. The gene is also connected to phenotypes including hypocotyl elongation, anthocyanin synthesis, shoot regeneration, and responses to cold, drought, and heat stress. Studies of related genes in other species link the family to fruit ripening, tuberization, senescence, and biotic stress resistance.