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Publication Type J
Authors Wall, M., S. Martos, L. Perez-Martin, C. Abdelly, T. Ghnaya, C. Poschenrieder and B. Gunse
Title Cadmium hampers salt tolerance of Sesuvium portulacastrum
Source Plant Physiology and Biochemistry
Author Keywords Cadmium Halophyte Salinity SpSOS1 SpAHA1 SpBADH Sesuvium portulacastrum salinity tolerance na+/h+ antiporter stress tolerance suaeda-salsa cd toxicity halophytes arabidopsis sodium leaves sos1
Abstract It is well known that salinity reduces cadmium toxicity in halophytes. However, the possible interference of Cd with the mechanisms of salt tolerance is poorly explored. The aim of this study was to see whether Cd affects salt tolerance mechanisms in the halophyte Sesuvium portulacastrum. S. portulacastrum plants obtained from cuttings were grown in hydroponics for 3 weeks and then exposed to low (0.09 mM) or moderate (200 mM) NaCl concentrations, alone or in combination with 25 AM CdCl2. Microscopy observation revealed two strategies of salt tolerance: euhalophytism and secretion of salt by bladder cells. Cadmium exposure hardly influenced the total leaf Na+ concentrations. However, Cd supply delayed the salt induced upregulation of AHA1 (plasma membrane H+-ATPase 1) and SOS1 (plasma membrane Na+ transporter "Salt Overly Sensitive 1"), genes that are essential for salt tolerance. Moreover, Cd induced the activation of BADH, coding for betaine aldehyde dehydrogenase, indicating enhanced osmotic stress due to Cd. Sodium-green fluorescence in protoplasts from plants grown with low or high NaCl, alone or in combination with Cd, revealed higher Na+ concentrations in the cytoplasm of Cd-exposed plants. Taken together the results indicate interference of Cd with salt tolerance mechanisms in S. portulacastrum. This may have consequences for the efficient use of halophytes in phytoremediation of Cd-contaminated saline soils. (C) 2017 Elsevier Masson SAS. All rights reserved.
Author Address [Wall, Mariem; Martos, Soledad; Perez-Martin, Laura; Poschenrieder, Charlotte; Gunse, Benet] Univ Autonoma Barcelona, Fac Biociences, Unitat Fisiol Vegetal, Dept BABVE, E-08193 Bellaterra, Cerdanyola Del, Spain. [Wall, Mariem; Abdelly, Chedly; Ghnaya, Tahar] Ctr Biotechnol Technopole Borj Cedria, Lab Plantes Extremophiles, BP 901, Hammam Lif 2050, Tunisia. Martos, S (reprint author), Univ Autonoma Barcelona, Fac Biociences, Unitat Fisiol Vegetal, Dept BABVE, E-08193 Bellaterra, Cerdanyola Del, Spain. soledad.martos@uab.cat
ISSN 0981-9428
ISBN 0981-9428
29-Character Source Abbreviation Plant Physiol. Biochem.
Publication Date Jun
Year Published 2017
Volume 115
Beginning Page 390-399
Digital Object Identifier (DOI) 10.1016/j.plaphy.2017.04.014
Unique Article Identifier WOS:000404424200037
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