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First published online August 7, 2003; 10.1104/pp.103.022178

Plant Physiology 133:307-318 (2003)
© 2003 American Society of Plant Biologists

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ENVIRONMENTAL STRESS AND ADAPTATION

Sodium Influx and Accumulation in Arabidopsis1

Pauline A. Essah, Romola Davenport and Mark Tester*

Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom

Arabidopsis is frequently used as a genetic model in plant salt tolerance studies, however, its physiological responses to salinity remain poorly characterized. This study presents a characterization of initial Na+ entry and the effects of Ca2+ on plant growth and net Na+ accumulation in saline conditions. Unidirectional Na+ influx was measured carefully using very short influx times in roots of 12-d-old seedlings. Influx showed three components with distinct sensitivities to Ca2+, diethylpyrocarbonate, and osmotic pretreatment. Pharmacological agents and known mutants were used to test the contribution of different transport pathways to Na+ uptake. Influx was stimulated by 4-aminobutyric acid and glutamic acid; was inhibited by flufenamate, quinine, and cGMP; and was insensitive to modulators of K+ and Ca2+ channels. Influx did not differ from wild type in akt1 and hkt1 insertional mutants. These data suggested that influx was mediated by several different types of nonselective cation channels. Na+ accumulation in plants grown in 50 mM NaCl was strongly reduced by increasing Ca2+ activity (from 0.05-3.0 mM), and plant survival was improved. However, plant biomass was not affected by shoot Na+ concentration, suggesting that in Arabidopsis Na+ toxicity is not dependent on shoot Na+ accumulation. These data suggest that Arabidopsis is a good model for investigation of Na+ transport, but may be of limited utility as a model for the study of Na+ toxicity.

1 This work was supported by a studentship from Churchill College (Cambridge) and an Overseas Research Scholarship (to P.A.E.), by a Royal Society Dorothy Hodgkin Research Fellowship (to R.D.), and by a Biotechnology and Biological Science Research Council Research Development Fellowship (to M.T.).

* Corresponding author; e-mail mat10{at}cam.ac.uk; fax 44 -1223-333953.

Received February 14, 2003; returned for revision March 19, 2003; accepted June 11, 2003.




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