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Potassium (K + ) levels in the soil often limit plant growth and development. As a result, crop production largely relies on the heavy use of chemical fertilizers, presenting a challenging problem in sustainable agriculture. To breed crops with higher K + -use efficiency (KUE), we must learn how K +  is acquired from the soil by the root system and transported to the rest of the plant through K +  transporters. In this study, we identified the function of the rice K +  transporter  OsHAK8 , whose expression level is downregulated in response to low-K +  stress. When  OsHAK8  was disrupted by CRISPR/Cas9-mediated mutagenesis,  Oshak8  mutant plants showed stunted growth, especially under low-K +  conditions. Ion content analyses indicated that K +  uptake and root-to-shoot K +  transport were significantly impaired in  Oshak8  mutants under low-K +  conditions. As the  OsHAK8  gene was broadly expressed in different cell types in the roots and its protein was targeted to the plasma membrane, we propose that OsHAK8 serves as a major transporter for both uptake and root-to-shoot translocation in rice plants.

Rice Potassium Transporter OsHAK8 Mediates K+ Uptake and Translocation in Response to Low K+ Stress