Rice OsHAK5 is a major potassium transporter that functions in potassium uptake with high specificity but contributes less to cesium uptake.

Cesium (Cs) in the environment is primarily absorbed by a potassium (K) transporter. OsHAK5 is a KT/HAK/KUP family K-transporter showing a high affinity for K. We created cultured rice cells whose OsHAK5 was knocked down by RNAi (named KD).