HY3 — Nicotiana attenuata

Summary

A4A49_20603 (HY3/PHYE) in Nicotiana attenuata encodes a phytochrome, a member of the Phytochrome_A-E family that contains domains including PAS, GAF, and histidine kinase. The gene is associated with tetrapyrrole binding and has been linked to regulation of response to red or far red light, positive regulation of the phytochrome signaling pathway, and regulation of plant organ formation. It is associated with numerous agronomic traits including grain yield, panicle number, flower diameter, leaf area, plant dry weight, vegetative vigor, photoperiod sensitivity, far red light sensitivity, and chlorophyll ratio. Associations also include responses to drought, cold, heat, and disease, as well as traits such as fruit set, branch angle, and root system morphology. Studies of related genes in other species link the family to photoperiod detection, fruit ripening, tuberization, and stress tolerance.