MaHAK5, a Potassium Transporter of Banana, Enhanced Potassium Uptake in Transgenic <i>Arabidopsis</i> under Low Potassium Conditions
Potassium (K<sup>+</sup>) is one of the most important macronutrients for plant growth and development. It is generally accepted that the KUP/HAK/KT transporters play essential roles in K<sup>+</sup> uptake at low concentrations. However, their physiological functions in bana...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-12-01
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| Series: | Horticulturae |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2311-7524/9/1/10 |
| Summary: | Potassium (K<sup>+</sup>) is one of the most important macronutrients for plant growth and development. It is generally accepted that the KUP/HAK/KT transporters play essential roles in K<sup>+</sup> uptake at low concentrations. However, their physiological functions in bananas remain unknown. Here, we cloned MaHAK5 and analyzed its functions in banana (<i>Musa acuminata</i>). Gene expression analysis showed that MaHAK5 was upregulated in the roots and leaves in the early stage of low K<sup>+</sup> (LK) stress. MaHAK5 was localized in the cytomembrane. The expression of MaHAK5 improved the growth of the low K<sup>+</sup>-sensitive yeast mutant R5421 at different K<sup>+</sup> supply levels. Overexpression of <i>MaHAK5</i> in <i>Arabidopsis thaliana</i> significantly enhanced the ability for K<sup>+</sup> uptake and increased the chlorophyll content under LK stress. These results indicate that <i>MaHAK5</i> plays a crucial role in maintaining K<sup>+</sup> uptake in bananas. |
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| ISSN: | 2311-7524 |