HY8 (BOLC102_C05P007630.1_BOLC102_V1) — Brassica oleracea

Summary

BoHY8 (HY8, PHYA, FHY2) on cabbage chromosome 5 encodes a phytochrome A-E family photoreceptor with domains including Phy_HATPase-like, GAF, PAS, and a histidine kinase domain. It exhibits photoreceptor activity, tetrapyrrole binding, and DNA-binding transcription activator activity. The gene is associated with detection of light, regulation of response to red or far red light, positive regulation of phytochrome signaling, and downregulation of chlorophyll anabolism. It is linked to numerous agronomic traits including grain yield, flower diameter, leaf area, leaf angle, plant growth hormone response, photoperiod sensitivity, far red and blue light sensitivity, vegetative vigor, fruit set, and glyphosate sensitivity. Localization evidence connects it to the thylakoid, nuclear envelope, and chloroplast nucleoid. Studies of related genes in other species link the family to far-red light signaling, shade-induced hypocotyl elongation, floral initiation, and thermotolerance.