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The Transcription Factor MYB59 Regulates K/NO Translocation in the Arabidopsis Response to Low K Stress

Overview
Journal Plant Cell
Specialties Biology
Cell Biology
Date 2019 Feb 15
PMID 30760559
Citations 46
Authors
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Abstract

Potassium and nitrogen are essential nutrients for plant growth and development. Plants can sense potassium nitrate (K/NO ) levels in soils, and accordingly they adjust root-to-shoot K/NO transport to balance the distribution of these ions between roots and shoots. In this study, we show that the transcription factorMYB59 maintains this balance by regulating the transcription of the Arabidopsis () ()/ () in response to low K (LK) stress. The mutant showed a yellow-shoot sensitive phenotype when grown on LK medium. Both the transcript and protein levels of were remarkably reduced in the mutant. LK stress repressed transcript levels of both and The and mutants, as well as the double mutant, showed similar LK-sensitive phenotypes. Ion content analyses indicated that root-to-shoot K/NO transport was significantly reduced in these mutants under LK conditions. Moreover, chromatin immunoprecipitation and electrophoresis mobility shift assay assays confirmed that MYB59 bound directly to the promoter. Expression of in root vasculature driven by the promoter rescued the sensitive phenotype of both and mutants. Together, these data demonstrate that responds to LK stress and directs root-to-shoot K/NO transport by regulating the expression of in Arabidopsis roots.

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