First published online February 25, 2005; 10.1104/pp.104.057307
Plant Physiology 137:807-818 (2005)
© 2005 American Society of Plant Biologists
Control of Sodium Transport in Durum Wheat1,[w]
Romola Davenport*,
Richard A. James,
Anna Zakrisson-Plogander2,
Mark Tester3 and
Rana Munns
Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom (R.D., A.Z.-P., M.T.); and Commonwealth Scientific and Industrial Research Organization Plant Industry, Canberra, Australian Capital Territory 2601, Australia (R.M., R.A.J.)
In many species, salt sensitivity is associated with the accumulation of sodium (Na+) in photosynthetic tissues. Na+ uptake to leaves involves a series of transport steps and so far very few candidate genes have been implicated in the control of these processes. In this study, Na+ transport was compared in two varieties of durum wheat (Triticum turgidum) L. subsp. durum known to differ in salt tolerance and Na+ accumulation; the relatively salt tolerant landrace line 149 and the salt sensitive cultivar Tamaroi. Genetic studies indicated that these genotypes differed at two major loci controlling leaf blade Na+ accumulation (R. Munns, G.J. Rebetzke, S. Husain, R.A. James, R.A. Hare [2003] Aust J Agric Res 54: 627–635). The physiological traits determined by these genetic differences were investigated using measurements of unidirectional 22Na+ transport and net Na+ accumulation. The major differences in Na+ transport between the genotypes were (1) the rate of transfer from the root to the shoot (xylem loading), which was much lower in the salt tolerant genotype, and (2) the capacity of the leaf sheath to extract and sequester Na+ as it entered the leaf. The genotypes did not differ significantly in unidirectional root uptake of Na+ and there was no evidence for recirculation of Na+ from shoots to roots. It is likely that xylem loading and leaf sheath sequestration are separate genetic traits that interact to control leaf blade Na+.
1 This work was supported by the Royal Society (Dorothy Hodgkin fellowship to R.D.), by the Commonwealth Scientific and Industrial Research Organization (career development grant to R.A.J.), by the Nuffield Foundation (summer student bursary to A.Z.-P.), by the Biotechnology and Biological Sciences Research Council (research development fellowship to M.T.) and Australian Research Council (Federation fellowship to M.T.), and by the Grains Research and Development Corporation (to R.M.).
2 Present address: Max Planck Institute f r Zchtungsforschung, Carl-von-Linne-Weg 10, 50829 Köln, Germany.
3 Present address: Australian Centre for Functional Genomics, Private Mail Bag 1, Glen Osmond, SA 5064, Australia.
[w] The online version of this article contains Web-only data.
Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.104.057307.
* Corresponding author; e-mail rjd23{at}cam.ac.uk; fax 44–1223–333953.
Received November 28, 2004;
returned for revision December 7, 2004;
accepted December 7, 2004.
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