HY8 (AT1G09570) — Arabidopsis thaliana

Summary

AT1G09570 (HY8, also known as PHYA) encodes a member of the phytochrome A-E family with tetrapyrrole binding activity. This gene is associated with the regulation of pigmentation, phototransduction, circadian behavior, and the termination of signal transduction. It is linked to far red light sensitivity, light quality response, and dark adaptation, as well as traits including seedling height, inflorescence length, grain yield, drought recovery, and copper sensitivity. HY8 is associated with processes such as phytochrome chromophore anabolism, protein catabolism in the vacuole, and the downregulation of chlorophyll anabolism and gluconeogenesis. Studies of related genes in other species link the family to fruit ripening, tuberization, drought tolerance, grain yield, and resistance to pathogens such as Pseudomonas syringae.