In planta evidence that the HAK transporter OsHAK2 is involved in Na+ transport in rice.
Biosci Biotechnol Biochem
; 87(5): 482-490, 2023 Apr 24.
Article
em En
| MEDLINE
| ID: mdl-36804662
ABSTRACT
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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01-internacional
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MEDLINE
Assunto principal:
Oryza
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article