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|Title:||Identification of a stelar-localized transport protein that facilitates root-to-shoot transfer of chloride in arabidopsis|
|Citation:||Plant Physiology, 2016; 170(2):1014-1029|
|Publisher:||American Society of Plant Biologists|
|Bo Li, Caitlin Byrt, Jiaen Qiu, Ute Baumann, Maria Hrmova, Aurelie Evrard, Alexander A.T. Johnson, Kenneth D. Birnbaum, Gwenda M. Mayo, Deepa Jha, Sam W. Henderson, Mark Tester, Mathew Gilliham, and Stuart J. Roy|
|Abstract:||Under saline conditions, higher plants restrict the accumulation of chloride ions (Cl⁻) in the shoot by regulating their transfer from the root symplast into the xylem-associated apoplast. To identify molecular mechanisms underpinning this phenomenon, we undertook a transcriptional screen of salt stressed Arabidopsis (Arabidopsis thaliana) roots. Microarrays, quantitative RT-PCR, and promoter-GUS fusions identified a candidate gene involved in Cl⁻ xylem loading from the Nitrate transporter 1/Peptide Transporter family (NPF2.4). This gene was highly expressed in the root stele compared to the cortex, and its expression decreased after exposure to NaCl or abscisic acid. NPF2.4 fused to fluorescent proteins, expressed either transiently or stably, was targeted to the plasma membrane. Electrophysiological analysis of NPF2.4 in Xenopus laevis oocytes suggested that NPF2.4 catalyzed passive Cl⁻ efflux out of cells and was much less permeable to NO₃⁻. Shoot Cl⁻ accumulation was decreased following NPF2.4 artificial microRNA knockdown, whereas it was increased by overexpression of NPF2.4. Taken together, these results suggest that NPF2.4 is involved in long-distance transport of Cl⁻ in plants, playing a role in the loading and the regulation of Cl⁻ loading into the xylem of Arabidopsis roots during salinity stress.|
|Keywords:||Oocytes; Cell Membrane; Animals; Xenopus laevis; Plants, Genetically Modified; Arabidopsis; Plant Shoots; Plant Roots; Chlorides; Sodium Chloride; Abscisic Acid; Glucuronidase; Membrane Transport Proteins; Arabidopsis Proteins; Computational Biology; Down-Regulation; Gene Expression Regulation, Plant; Biological Transport; Genes, Plant; Xylem; Promoter Regions, Genetic; Gene Knockdown Techniques; Genetic Association Studies|
|Rights:||Copyright © 2016 American Society of Plant Biologists. All rights reserved.|
|Appears in Collections:||Agriculture, Food and Wine publications|
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