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https://hdl.handle.net/2440/131715
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Type: | Journal article |
Title: | MYB77 regulates high-affinity potassium uptake by promoting expression of HAK5 |
Author: | Feng, C.-Z. Luo, Y.-X. Wang, P.-D. Gilliham, M. Long, Y. |
Citation: | New Phytologist, 2021; 232(1):1-14 |
Publisher: | Wiley |
Issue Date: | 2021 |
ISSN: | 0028-646X 1469-8137 |
Statement of Responsibility: | Cui-zhu Feng, Yun-xin Luo, Peng-dan Wang, Matthew Gilliham, Yu Long |
Abstract: | In Arabidopsis, the High-affinity K+ transporter HAK5 is the major pathway for root K+ uptake when below 100 μM; HAK5 responds to Low-K+ (LK) stress by strongly and rapidly increasing its expression during K+ -deficiency. Therefore, positive regulators of HAK5 expression have the potential to improve K+ uptake under LK. Here, we show that mutants of the transcription factor MYB77 share a LK-induced leaf chlorosis phenotype, lower K+ content, and lower Rb+ uptake of the hak5 mutant, but not the shorter root growth, and that overexpression of MYB77 enhanced K+ uptake and improved tolerance to LK stress. Further, we demonstrate that MYB77 positively regulates the expression of HAK5, by binding to the HAK5 promoter and enhances high-affinity K+ uptake of roots. As such, our results reveal a novel pathway for enhancing HAK5 expression under LK stress, and provides a candidate for increasing the tolerance of plants to LK. |
Keywords: | HAK5 High-affinity K+ uptake MYB77 Transcription factor leaf chlorosis |
Rights: | © 2021 The Authors. New Phytologist © 2021 New Phytologist Foundatio |
DOI: | 10.1111/nph.17589 |
Grant ID: | http://purl.org/au-research/grants/arc/CE140100008 |
Published version: | http://dx.doi.org/10.1111/nph.17589 |
Appears in Collections: | Aurora harvest 4 Environment Institute publications |
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