HY3 — Lactuca sativa

Summary

LsHY3, located on chromosome 7 of garden lettuce (Lactuca sativa), encodes a phytochrome protein, a member of the phytochrome family that includes domains such as PAS_2, PHY_dom, GAF, and a phytochrome chromophore attachment site. The gene is associated with tetrapyrrole binding and a wide array of molecular functions, including transcription regulator activator activity. It is linked to the regulation of response to red or far red light, positive regulation of the phytochrome signaling pathway, detection of light, and downregulation of chlorophyll anabolism. Associations with agronomically relevant traits include light quality response, far red light sensitivity, photoperiod sensitivity, grain yield, panicle number, leaf area, plant dry weight, and vegetative vigor. The gene is also connected to phenotypes such as delayed flowering, hypocotyl elongation, and drought stress response.