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Significance High-affinity K+ (HAK) transporter-mediated K+ uptake has an important role when plants are subjected to stresses. This work identifies a mechanism of HAK regulation. The affinity of HAK at the plasma membrane for K+ depends on the binding of a cytochrome (CYB5) protein at the endoplasmic reticulum. This improves K+ uptake and the ability of plants to survive under saline conditions. The HAK–CYB5 interaction not only constitutes a mechanism of HAK regulation but also reflects interorganelle communication mediated by functional protein interactions under conditions of stress.

proceedings of the national academy of sciences

An endoplasmic reticulum–localized cytochrome b 5 regulates high-affinity K + transport in response to salt stress in rice