ABI1 — Sorghum bicolor

Summary

SORBI_3009G255900, designated SbABI1 on sorghum chromosome 9, encodes a protein with a PP2C phosphatase domain and is annotated with multiple molecular functions including sucrose-phosphate synthase activity, kinase regulator activity, and protein phosphatase regulator activity. The gene is associated with abscisic acid (ABA) signaling, drought and salinity responses, and root structure development. It has been linked to pre-harvest sprouting, water stress response, biomass yield, seed yield, and seed viability traits. Additional associations include regulation of actin polymerization, cell shape, anisotropic cell growth, and secondary cell wall formation. The gene product localizes to the Arp2/3 protein complex, SCAR complex, and protein serine/threonine phosphatase complex. Studies of related genes in other species connect the family to drought resistance, root architecture, and root hair elongation.