KC1 — Sorghum bicolor

Summary

SbKC1 (SORBI_3003G237900) on sorghum chromosome 3 encodes a voltage-sensitive potassium channel with outward rectifier potassium channel activity, ion transporter activity, and additional annotated molecular functions including ATPase inhibitor activity and calcium-dependent protein serine/threonine phosphatase activity. The protein contains KHA, KAT/AKT, ion transport, cNMP-binding, and ankyrin repeat domains. SbKC1 is associated with regulation of membrane potential, stomatal opening, potassium ion transport and homeostasis, hypotonic salinity response, and cell plate formation. It has been linked to numerous agronomically important traits including yield, leaf necrosis tolerance, water stress response, transpiration rate, stomatal complex closure time, days to flowering, sucrose content, nitrogen sensitivity, and aluminum response. The gene is also connected to potassium translocation, osmotic pressure regulation, reactive oxygen species response, and mineral nutrient partitioning. Studies of related genes in other species link the family to drought stress tolerance, salt response, and root and shoot potassium content.