HY3 — Solanum lycopersicum

Summary

SOLYC02G071260.3 (HY3, also known as PHYE) on tomato chromosome 2 encodes a protein with phytochrome A–E, PAS, GAF, and histidine kinase domains and is associated with tetrapyrrole binding. The gene is associated with regulation of response to red or far red light, positive regulation of phytochrome signaling pathway, and regulation of plant organ formation. It is linked to traits including grain yield, fruit set, flower diameter, panicle number, leaf area, specific leaf weight, branch angle, vegetative vigor, plant dry weight, and light quality response, far red light sensitivity, copper sensitivity, and glyphosate sensitivity. Associations also extend to fruit ripening, photoperiod detection, anthocyanin synthesis, salinity tolerance, nitrogen utilization, potassium utilization, and drought stress response and cold stress response. Studies of related genes in other species connect the phytochrome family to tuberization, lycopene content, carotenoid accumulation, and resistance to Botrytis cinerea and Fusarium graminearum.