HY3 — Solanum lycopersicum

Summary

SOLYC07G045480.3 (HY3, also known as PHYF) encodes a phytochrome family member on tomato chromosome 7, containing phytochrome, PAS, GAF, and histidine kinase domains. The encoded protein exhibits tetrapyrrole binding and is associated with phytochrome chromophore biosynthesis, regulation of red and far-red light responses, and positive regulation of the phytochrome signaling pathway. This gene is linked to numerous agronomic traits including fruit set, flower diameter, panicle number, grain yield, plant dry weight, vegetative vigor, leaf area, branch angle, and inflorescence length. Associations also include responses to light quality, photoperiod, far-red and blue light sensitivity, copper and glyphosate sensitivity, and nitrogen, phosphorus, and potassium utilization. Studies of related genes in other species connect the family to tuberization, carotenoid accumulation, senescence, and thermotolerance.