HY3 (LSAT_V11C900489970) — Lactuca sativa

Summary

LsHY3, encoded by the gene LSAT_V11C900489970 on chromosome 9 of garden lettuce (Lactuca sativa), is a phytochrome family protein containing domains characteristic of phytochrome A–E, including PAS, GAF, and histidine kinase domains. The gene is associated with tetrapyrrole binding and a wide array of molecular functions, including transcription regulator activator activity. It has been linked to biological processes such as regulation of response to red or far red light, positive regulation of the phytochrome signaling pathway, detection of light, and regulation of plant organ formation. Associations with agronomically relevant traits include 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 delayed flowering, hypocotyl elongation, drought and cold stress responses, disease resistance, and carbon assimilation.