OS03G0719800 — Oryza sativa Japonica

Summary

OS03G0719800 (HY8/PHYA) on rice chromosome 3 encodes a phytochrome A photoreceptor, a member of the phytochrome family with domains including GAF, PAS, and histidine kinase. It possesses photoreceptor activity, tetrapyrrole binding, and DNA-binding transcription activator activity. The gene is associated with detection of light, positive regulation of the phytochrome signaling pathway, and responses to far-red light, magnetism, and mycotoxin. It has been linked to numerous agronomic traits including heading date, photoperiod sensitivity, panicle number, stem length, coleoptile length, adventitious root number, leaf area, vegetative vigor, flower diameter, and fruit set. Associations also include plant growth hormone response, submergence response, glyphosate sensitivity, and hybrid incompatibility. Studies of related genes in other species connect the phytochrome A family to far-red light signaling, thermotolerance, pathogen defense, and floral initiation.