HY3 (AT2G18790) — Arabidopsis thaliana

Summary

AT2G18790, also known as HY3 or PHYB, encodes a protein with phytochrome domains including PAS, GAF, and a histidine kinase domain. In Arabidopsis thaliana, this gene is associated with a wide range of biological processes including regulation of shade avoidance, phototransduction, circadian behavior, and termination of signal transduction. It has been connected to numerous agronomically relevant traits such as seedling height, leaf area index, plant dry weight, drought recovery, and far-red light sensitivity. The gene is also linked to phenotypes including delayed flowering, hypocotyl elongation, anthocyanin synthesis, and responses to cold, drought, and biotic stress. Studies of related genes in other species have connected the phytochrome B family to traits including fruit ripening, tuberization, grain yield, and disease resistance.