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- Title
Rice OsHAK5 is a major potassium transporter that functions in potassium uptake with high specificity but contributes less to cesium uptake.
- Authors
Minato Uchiyama; Rika Fudaki; Takuya Kobayashi; Yoshiko Adachi; Yuko Ukai; Toshihiro Yoshihara; Hiroaki Shimada
- Abstract
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) . In the medium containing 1.0 m m and less K, the growth of KD was significantly suppressed, suggesting that OsHAK5 greatly contributed to K absorption under limited K conditions. Although Cs suppressed the growth of KD and WT, stronger inhibition was observed on KD. Both KD and WT accumulated similar amounts of Cs when they were cultured in a medium containing Cs, whereas lower amounts of K were detected in KD. These results suggest that OsHAK5 was less involved in the absorption of Cs, although it was essential to K absorption under limited K conditions. In contrast, this means that another transporter may contribute to cesium uptake in rice.
- Subjects
POTASSIUM; RICE; ABSORPTION; CESIUM ions; CESIUM
- Publication
Bioscience, Biotechnology & Biochemistry, 2022, Vol 86, Issue 11, p1599
- ISSN
0916-8451
- Publication type
Article
- DOI
10.1093/bbb/zbac152