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Publication Type J
Authors Vromman, D., I. Lefevre, Z. Slejkovec, J. P. Martinez, N. Vanhecke, M. Briceno, M. Kumar and S. Lutts
Title Salinity influences arsenic resistance in the xerohalophyte Atriplex atacamensis Phil
Source Environmental and Experimental Botany
Author Keywords Abiotic stress Arsenate Arsenite Arsenic Halophyte Heavy metals Mineral toxicity Phytoremediation Plant growth Plant physiology Pollution Salt Salinity Toxic ions hyperaccumulator pteris-vittata rice oryza-sativa northern chile drinking-water salt stress heavy-metal halimus l. accumulation plants tolerance
Abstract Arsenic (As) is a highly toxic element accumulating in the environment as a result of anthropogenic activity. In Northern Chile it accumulates in salt areas and constitutes a major threat for human population. Atriplex atacamensis is a perennial halophyte shrub spontaneously growing in these contaminated areas. In order to determine the impact of salinity on As absorption and accumulation in A. atacamensis, young seedlings obtained from seeds collected on an As-polluted area were cultivated for 2 and 4 weeks in nutrient solutions containing no As and no NaCl (control), NaCl 100 mM, As(V) 1000 mu M and NaCl 100 mM + As(V) 1000 mu M. Speciation analysis indicates that arsenic in the solution remained in the As(V) form. Roots accumulated high concentration of As (up to 5020 mu g g(-1) DW): 55% of total extractable As was in the reduced state As(III) and 45% as As(V). More than half of the total As accumulated in cell walls. The leaves accumulated lower amounts of total As, with a majority of As(V) in the extractable fraction. Addition of NaCl to the As-containing nutrient solution reduced As concentration in the roots and increased the proportion of As(V) comparatively to As(III). Salinity strongly increased As translocation from the root to the shoot but did not modify its distribution between apoplasm and symplasm compartments. Exogenous salinity reduced the As-induced senescing ethylene synthesis in As-treated plants and contributed to a more efficient antioxydation system. Salinity and As induced the synthesis of major protective molecules (proline, glycinebetaine, trigonelline, polyamines, non-protein thiols), some of them being involved in short-term response to ion toxicities while others appeared to be required for longer period. It is concluded that Atriplex atacamensis is an interesting tool for the phytomanagement of As-contaminated area and that salinity improves the plant resistance to this dangerous pollutant. (C) 2016 Elsevier B.V. All rights reserved.
Author Address [Vromman, Delphine; Lefevre, Isabelle; Vanhecke, Nicolas; Lutts, Stanley] Catholic Univ Louvain, ELI A, GRPV, 5 Bte L 7-07-13 Pl Croix Sud, B-1348 Louvain, Belgium. [Slejkovec, Zdenka] Jozef Stefan Inst, Jamova 39, Ljubljana 1000, Slovenia. [Martinez, Juan-Pablo] Inst Invest Ageopecuarias INIA La Cruz, Chorillos 86, La Cruz, Chile. [Briceno, Margarita] Univ Arturo Prat, Fac Ciencias Salud, Ave Arturo Prat 2120, Iquique, Chile. [Kumar, Mahendra] Sci Res, Ave Costanera 4976, Iquique, Chile. Lutts, S (reprint author), Catholic Univ Louvain, ELI A, GRPV, 5 Bte L 7-07-13 Pl Croix Sud, B-1348 Louvain, Belgium. stanley.lutts@uclouvain.be
ISSN 0098-8472
ISBN 0098-8472
29-Character Source Abbreviation Environ. Exp. Bot.
Publication Date Jun
Year Published 2016
Volume 126
Beginning Page 32-43
Digital Object Identifier (DOI) 10.1016/j.envexpbot.2016.01.004
Unique Article Identifier WOS:000374603500004
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