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Plant Cell, Vol. 13, 125-137, January 2001, Copyright © 2001, American Society of Plant Physiologists
sas1, an Arabidopsis Mutant Overaccumulating Sodium in the Shoot, Shows Deficiency in the Control of the Root Radial Transport of Sodium
Aurélie Nublata,
Jérôme Desplansa,
Francine Cassea, and
Pierre Berthomieua
a Biochimie et Physiologie Moléculaire des Plantes, Unité Mixte de Recherche 5004, Ecole National Supérieure Agronomique de Montpellier, Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique, Université Montpellier II, 34060 Montpellier Cédex 2, France
Correspondence to:
Pierre Berthomieu, berthom{at}ensam.inra.fr (E-mail), 33-467-525-737 (fax)
A recessive mutation of Arabidopsis designated sas1 (for sodium overaccumulation in shoot) that was mapped to the bottom of chromosome III resulted in a two- to sevenfold overaccumulation of Na+ in shoots compared with wild-type plants. sas1 is a pleiotropic mutation that also caused severe growth reduction. The impact of NaCl stress on growth was similar for sas1 and wild-type plants; however, with regard to survival, sas1 plants displayed increased sensitivity to NaCl and LiCl treatments compared with wild-type plants. sas1 mutants overaccumulated Na+ and its toxic structural analog Li+, but not K+, Mg2+, or Ca2+. Sodium accumulated preferentially over K+ in a similar manner for sas1 and wild-type plants. Sodium overaccumulation occurred in all of the aerial organs of intact sas1 plants but not in roots. Sodium-treated leaf fragments or calli displayed similar Na+ accumulation levels for sas1 and wild-type tissues. This suggested that the sas1 mutation impaired Na+ long-distance transport from roots to shoots. The transpiration stream was similar in sas1 and wild-type plants, whereas the Na+ concentration in the xylem sap of sas1 plants was 5.5-fold higher than that of wild-type plants. These results suggest that the sas1 mutation disrupts control of the radial transport of Na+ from the soil solution to the xylem vessels.
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