At4g22200: AKT2/3 (ARABIDOPSIS POTASSIUM TRANSPORT 2/3)

Encodes a photosynthate- and light-dependent inward rectifying potassium channel with unique gating properties that are regulated by phosphorylation. Expressed in guard cell protoplasts and in the phloem and xylem of aerial portions of the plant. The channel can coassemble with another K channel, KAT1, in vitro. In guard cells, AKT2/3 is responsible for the Ca2 sensitivity of the K uptake channel. In the phloem, it regulates the sucrose/H symporters via the phloem potential.