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
in 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.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Oryza
Language:
En
Journal:
Biosci Biotechnol Biochem
Journal subject:
BIOQUIMICA
/
BIOTECNOLOGIA
Year:
2023
Document type:
Article
Affiliation country:
Japan