HY3 — Brassica oleracea

Summary

BoHY3, also known as HY3, PHYB, or OOP1, is a cabbage (Brassica oleracea) gene on chromosome 5 that encodes a protein belonging to the Phytochrome_A-E family and containing domains such as PAS, GAF, and histidine kinase. It is associated with photoreceptor activity, tetrapyrrole binding, and the detection of light, as well as the regulation of plant organ formation, chromatin organization, and organ growth. The gene is linked to numerous agronomically relevant traits, including grain yield, panicle number, flower diameter, leaf area, stem length, chlorophyll ratio, plant dry weight, and responses to light quality, submergence, and various stresses. It is also connected to phenotypes such as defense response, carbon assimilation, starch synthesis, and ABA sensitivity. Studies of related genes in other species link the family to phytochrome-mediated light signaling, shade avoidance, photoperiod sensitivity, and stress tolerance.