HY5 — Solanum lycopersicum

Summary

SOLYC08G061130.3 (HY5) on tomato chromosome 8 encodes a bZIP transcription factor of the Hac1/HY5 family with DNA-binding transcription activator activity, RNA polymerase II-specific, and is associated with phytochrome binding and photoreceptor activities. In tomato, HY5 is linked to sugar content, carotenoid and phenylpropanoid biosynthesis, steroidal glycoalkaloid accumulation, fruit ripening, and cold tolerance. It is associated with regulation of secondary metabolism, phototransduction, thermomorphogenesis, and upregulation of photosynthesis. The gene has been connected to traits including fruit quality, grain yield, root system morphology, light sensitivity, and osmotic adjustment capacity. Studies of related genes in other species link the family to light signaling, flavonol biosynthesis, freezing tolerance, and grain yield.