SOLYC01G059870.4 — Solanum lycopersicum

Summary

Tomato gene HY3 (PHYB1) on chromosome 1 encodes a phytochrome photoreceptor protein, a member of the phytochrome A-E family that contains GAF, PAS, and domains and is annotated with tetrapyrrole binding activity. In tomato, PHYB1 is associated with photoperiod detection, fruit ripening, polar auxin transport, and salinity tolerance. The gene is linked to regulation of response to red or far red light, positive regulation of phytochrome signaling, and phytochrome chromophore anabolism. Associations also include traits such as light quality response, far red light sensitivity, chlorophyll ratio, fruit set, grain yield, plant growth hormone response, vegetative vigor, leaf area, and photoperiod sensitivity. Studies of related genes in other species connect the family to tuberization, lycopene accumulation, senescence, drought tolerance, and resistance to fungal pathogens.