期刊
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
卷 87, 期 5, 页码 482-490出版社
OXFORD UNIV PRESS
DOI: 10.1093/bbb/zbad020
关键词
HAK transporters; Oryza sativa; OsHAK2; sodium transport
This study demonstrates that OsHAK2 gene in rice is involved in Na+ transport, promoting shoot growth under low Na+ and K+ conditions. However, overexpression of OsHAK2 increases salt sensitivity, indicating that it is not associated with salt tolerance.
HAK family transporters primarily function as K+ transporters and play major roles in K+ uptake and translocation in plants, whereas several HAK transporters exhibit Na+ transport activity. OsHAK2, a rice HAK transporter, was shown to mediate Na+ transport in Escherichia coli in a previous study. In this study, we investigated whether OsHAK2 is involved in Na+ transport in the rice plant. Overexpression of OsHAK2 increased Na+ translocation from the roots to the shoots of transgenic rice. It also increased both root and whole-plant Na+ content, and enhanced shoot length under low Na+ and K+ conditions. Meanwhile, OsHAK2 overexpression increased salt sensitivity under a long-term salt stress condition, indicating that OsHAK2 is not involved in salt tolerance, unlike in the case of ZmHAK4 in maize. These results suggest that OsHAK2 is permeable to Na+ and contributes to shoot growth in rice plants under low Na+ and K+ conditions.
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