HY3 — Nicotiana attenuata

Summary

A4A49_01197 (HY3, PHYA1) on chromosome 6 of Nicotiana attenuata encodes a phytochrome A-E family protein with a GAF domain, PAS domains, a phytochrome domain, and a histidine kinase domain. It is associated with tetrapyrrole binding and the regulation of responses to red or far-red light, as well as the positive regulation of the phytochrome signaling pathway. The gene is linked to numerous traits including grain yield, panicle number, flower diameter, leaf area, plant dry weight, vegetative vigor, photoperiod sensitivity, far-red and blue light sensitivity, copper and glyphosate sensitivity, and phenolic compound content. It is also connected to phenotypes such as delayed flowering, chlorophyll accumulation, anthocyanin synthesis, drought and cold stress responses, disease resistance, and defense responses. Studies of related genes in other species link the family to tuberization, fruit ripening, and herbivore defense.