GS2 — Sorghum bicolor

Summary

SORBI_3006G203400 (SbGS2) encodes a growth-regulating factor (GRF) protein containing QLQ and WRC domains and functions as a transcription coactivator with ATP and protein binding activity. Localized to the nucleus, it is associated with seed development, grain filling, grain weight, and yield, as well as leaf growth and morphology, root meristem growth, cell proliferation, and response to gibberellin, cold, and deep water. The gene is linked to starch anabolism, cell cycle regulation, and floral organ development including ovary, pistil, and anther traits. Related genes in other species are associated with grain size, heat and cold tolerance, organ size control, and regeneration efficiency, while sequence similarity links extend associations to grain shape, protein content, tiller number, and nitrogen recycling in cereals.