HY3 — Brachypodium distachyon

Summary

BdHY3 (BRADI_1G64360V3) on chromosome 1 of Brachypodium distachyon encodes a protein with phytochrome A-E, PAS, GAF, and histidine kinase domains, and is associated with photoreceptor activity and tetrapyrrole binding. The gene is associated with detection of light, positive regulation of phytochrome signaling, downregulation of chlorophyll anabolism, and response to magnetism. It is linked to numerous agronomic traits including heading date, photoperiod sensitivity, chlorophyll ratio, inflorescence length, panicle number, plant dry weight, vegetative vigor, leaf area, root system morphology, and responses to far-red light, copper, glyphosate, and nitrogen. Associations also include flower diameter, fruit set, seedling cotyledon size, and subterranean shoot axis tuber size. Studies of related genes in other species connect the phytochrome family to tillering, drought tolerance, grain size and weight, leaf chlorophyll content, and sheath blight resistance.