HY5 — Lactuca sativa

Summary

LsHY5, on chromosome 6 of garden lettuce (Lactuca sativa), encodes a bZIP transcription factor of the Hac1/HY5 family with DNA-binding transcription activator activity, RNA polymerase II-specific. It is associated with phytochrome binding, red/far-red light photoreceptor activity, and regulation of the phytochrome signaling pathway. The gene is linked to upregulation of photosynthesis and anthocyanin metabolism, as well as cellular water homeostasis and sucrose-mediated signaling. Associations include traits such as light quality response, far red and blue light sensitivity, leaf area, grain yield, fruit quality, osmotic adjustment capacity, and viral disease response. Phenotypic connections include lycopene content, photosynthetic pigment biosynthesis, primary root length, abscisic acid response, and fungal tolerance. Studies of related genes in other species link the family to light signaling, photoperiod-dependent flowering, and peroxisomal matrix protein import.