Altered shoot/root Na+ distribution and bifurcating salt sensitivity in Arabidopsis by genetic disruption of the Na+ transporter AtHKT1

Pascal Mäser, Brendan Eckelman, Rama Vaidyanathan, Tomoaki Horie, David J. Fairbairn, Masahiro Kubo, Mutsumi Yamagami, Katsushi Yamaguchi, Mikio Nishimura, Nobuyuki Uozumi, Whitney Robertson, Michael R. Sussman, Julian I. Schroeder

Research output: Contribution to journalArticle

254 Citations (Scopus)

Abstract

Sodium (Na+) is toxic to most plants, but the molecular mechanisms of plant Na+ uptake and distribution remain largely unknown. Here we analyze Arabidopsis lines disrupted in the Na+ transporter AtHKT1. AtHKT1 is expressed in the root stele and leaf vasculature. athkt1 null plants exhibit lower root Na+ levels and are more salt resistant than wild-type in short-term root growth assays. In shoot tissues, however, athkt1 disruption produces higher Na+ levels, and athkt1 and athkt1/sos3 shoots are Na+-hypersensitive in long-term growth assays. Thus wild-type AtHKT1 controls root/shoot Na+ distribution and counteracts salt stress in leaves by reducing leaf Na+ accumulation.

Original languageEnglish
Pages (from-to)157-161
Number of pages5
JournalFEBS Letters
Volume531
Issue number2
DOIs
Publication statusPublished - 2002 Nov 6

Keywords

  • Arabidopsis thaliana
  • Salt stress
  • Sodium transport
  • T-DNA insertion

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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