期刊
FEBS LETTERS
卷 531, 期 2, 页码 157-161出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0014-5793(02)03488-9
关键词
sodium transport; salt stress; T-DNA insertion; Arabidopsis thaliana
资金
- NIEHS NIH HHS [1P42ES10337] Funding Source: Medline
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 athktl/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. (C) 2002 Published by Elsevier Science B.V. on behalf of the Federation of European Biochemical Societies.
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