FB — Sorghum bicolor

Summary

SORBI_3003G040900 (SbFB, also known as SbGI) on sorghum chromosome 3 encodes a protein with multiple annotated molecular functions, including DNA-binding transcription repressor activity, blue light photoreceptor activity, and protein O-GlcNAc transferase activity. The gene is associated with circadian rhythm regulation, including photoentrainment, temperature compensation, and downregulation of the circadian clock, as well as photoperiod-sensitive flowering time, the vegetative-to-reproductive phase transition, and meristem determinacy. It is linked to xanthophyll and carotenoid metabolism, abscisic acid concentration, and responses to drought, temperature stress, and nitrate starvation. Associations also extend to yield-related traits such as grain weight, tiller number, and inflorescence length, as well as viral and aphid response traits. Studies of related genes in other species link the family to circadian regulation, flowering time, and stress tolerance.