B-1 — Sorghum bicolor

Summary

SORBI_3006G102300 (SbB-1) on sorghum chromosome 6 encodes a major facilitator superfamily (MFS) domain-containing protein with hexose transmembrane transporter activity. The gene is associated with monosaccharide transmembrane transport, nitrate transmembrane transport, potassium ion homeostasis, and abscisic acid metabolism. It has been linked to agronomically important traits including photosynthetic ability, biomass yield, carotenoid content, photoperiod-sensitive flowering time, water stress response, leaf drying, and seed longevity. Additional associations include responses to nutrient levels (nitrogen, phosphorus, potassium, magnesium, manganese), light sensitivity (red, far-red, UV-B), and biotic stress. The gene product localizes to multiple cellular compartments including the tonoplast, endosome, Golgi, chloroplast stroma, and nuclear envelope. Related genes in other species link the family to root-to-shoot nitrate transport, salt tolerance, and cadmium resistance, as well as nitrate sensing and lateral root development.