HY5 — Sorghum bicolor

Summary

SORBI_3004G085600, designated SbHY5, encodes a protein of the Hac1/HY5 family with a bZIP domain. The product is annotated with DNA-binding transcription activator activity, phytochrome binding, and photoreceptor activities for red and far-red light. In sorghum, SbHY5 is associated with regulation of phytochrome signaling, upregulation of photosynthesis, positive regulation of anthocyanin metabolism, upregulation of lateral root development, citrate secretion, and cellular water homeostasis. It localizes to the nucleus, cytosol, plasmodesmata, and mitochondria, and participates in ubiquitin-mediated degradation of HY5. The gene is linked to numerous agronomic traits including aluminum tolerance, osmotic adjustment capacity, seed coat hardness, vegetative vigor, leaf area, root system morphology, brassinosteroid content, total soluble sugar content, starch grain synthesis, and responses to light quality, temperature stress, and viral disease. Related genes in other species connect the family to light signaling, photoperiod-dependent flowering, salt stress tolerance, and light-induced peroxisome proliferation.