CO (AT5G15840) — Arabidopsis thaliana

Summary

AT5G15840, known as CO (CONSTANS) and BBX1, encodes a CONSTANS-like zinc-finger protein with a B-box domain and a CCT domain. It is associated with OGTase activity, peptide-O-fucosyltransferase activity, and protein N-GlcNAc transferase activity, as well as transcription factor binding and red/far-red light photoreceptor activity. CO is linked to the regulation of flowering time, particularly in response to long-day photoperiods, and to flower formation, leaf abscission, and chromatin looping. It has been connected to traits including inflorescence height, stem number, seed protein content, drought recovery, far-red light sensitivity, and vegetative vigor. The gene is also associated with responses to UV-A, mannose, and phytochrome signaling, and with pathways such as the expression of Hd1 under long and short days and drought escape via an ABA-independent pathway.