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Publication Type J
Authors Bendaly, A., D. Messedi, A. Smaoui, R. Ksouri, A. Bouchereau and C. Abdelly
Title Physiological and leaf metabolome changes in the xerohalophyte species Atriplex halimus induced by salinity
Source Plant Physiology and Biochemistry
Author Keywords Atriplex halimus Antioxidant activity Metabolites Osmotic adjustment Osmoprotection Photosynthesis Salinity chlorophyll fluorescence osmotic adjustment oxidative stress salt stress antioxidant capacity organic osmolytes abiotic stress plants tolerance growth
Abstract Atriplex halimus is a xerohalophyte plant, which could be used as cash crops. This plant was integrated in Tunisian government programs the aim of which is to rehabilitate saline areas and desert. To investigate its strategies involved in salt tolerance, A. halimus was grown hydroponically under controlled conditions with increasing salinity. Plants were harvested and analyzed after 60 days of treatment. The biomass of A. halimus increased by moderate salinity and decreased significantly at high salinity compared to control plants at 400 mM. Despite of the large amounts of Na+ observed in the leaves of Atriplex plants, leaf water contents and leaf succulence kept on increasing in treated plants and decreased over 150 mM NaCl. This confirmed the compartmentation and the efficient contribution of Na+ in the osmotic adjustment. Analysis of the metabolic profiles showed an accumulation of carbohydrates and amino acids. The leaf tissues preferentially stored proline, a alanine and sucrose. Increasing NaCl levels were also accompanied by a significant accumulation of malate in leaves. Involvement of these solutes in osmotic adjustment was considered low. Nevertheless, they seemed to have an important role in controlling photosynthesis which capacity was enhanced by low salinity and decreased with increasing salinity (evaluated by actual photochemical efficiency of photosystem II and chlorophyll contents). The unchanged maximum photochemical efficiency of photosystem II accompanied by the increase of the non-photochemical quenching, the enhancement of the total antioxidant activity and the decrease of the malondialdehyde contents in leaves showed efficient protection of membranes and photosystem II from photo oxidative damage. This protection seemed to be attributed to proline and sucrose largely accumulated in leaves treated with salt. (C) 2016 Elsevier Masson SAS. All rights reserved.
Author Address [Bendaly, Alia; Messedi, Dorsaf; Smaoui, Abderrazak; Abdelly, Chedly] Ctr Biotechnol Borj Cedria, Lab Plantes Extremophiles, BP 901, Hammam Lif 2050, Tunisia. [Ksouri, Riadh] Ctr Biotechnol Borj Cedria, Lab Plantes Aromat & Med, BP 901, Hammam Lif 2050, Tunisia. [Bouchereau, Alain] Univ Rennes 1, INRA Agrocampus Rennes, UMR 118, UFR Sci Vie & Environm, F-35014 Rennes, France. Bendaly, A (reprint author), Ctr Biotechnol Borj Cedria, Lab Plantes Extremophiles, BP 901, Hammam Lif 2050, Tunisia. aliabendaly@yahoo.fr
ISSN 0981-9428
ISBN 0981-9428
29-Character Source Abbreviation Plant Physiol. Biochem.
Publication Date Jun
Year Published 2016
Volume 103
Beginning Page 208-218
Digital Object Identifier (DOI) 10.1016/j.plaphy.2016.02.037
Unique Article Identifier WOS:000375163900021
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