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Publication Type J
Authors Amari, T., A. Souid, R. Ghabriche, M. Porrini, S. Lutts, G. A. Sacchi, C. Abdelly and T. Ghnaya
Title Why Does the Halophyte Mesembryanthemum crystallinum Better Tolerate Ni Toxicity than Brassica juncea: Implication of Antioxidant Defense Systems
Source Plants-Basel
Author Keywords antioxidant systems glycophyte halophyte nickel stress phytoremediation induced oxidative stress sesuvium-portulacastrum biochemical responses lipid-peroxidation enzyme-activities amino-acids metal accumulation nickel tolerance organic-acids heavy-metals
Abstract The implication of enzymatic and non-enzymatic antioxidative systems in response to Ni was evaluated in the halophyte Mesembryanthemum crystallinum in comparison with the metal tolerant glycophyte species Brassica juncea. Seedlings of both species were hydroponically subjected during 21 days to 0, 25, 50, and 100 mu M NiCl2. Growth parameters showed that the halophyte M. crystallinum was more tolerant to Ni than B. juncea. Malondialdehyde (MDA) content increased to a higher extent in B. juncea than in M. crystallinum. Antioxidant enzymesactivities were differently affected by Ni in both species. Nickel increased shoot superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities in B. juncea, whereas these activities were reduced in M. crystallinum when exposed to metal stress. The root SOD, APX and guaiacol peroxidase (GPX) activities increased upon Ni treatments for both species. The content of non-enzymatic antioxidative molecules such as glutathione, non-protein thiols and proline increased in Ni-treated plants, except for GSH content in the shoot of B. juncea. Based on the oxidative balance, our findings confirm the higher tolerance of the halophyte M. crystallinum to Ni-induced oxidative stress comparatively to B. juncea. We suggest that M. crystallinum is able to overcome the produced ROS using the non-enzymatic system, while Ni-induced oxidative stress was more acute in B. juncea, leading this species to mainly use the enzymatic system to protect against reactive oxygen species.
Author Address [Amari, Taoufik; Souid, Aymen; Ghabriche, Rim; Abdelly, Chedly; Ghnaya, Tahar] Ctr Biotechnol Borj Cedria, Lab PlantesExtremophiles, BP 901, Hammam Lif 2050, Tunisia. [Porrini, Mauro; Sacchi, Gian Attilio] Univ Milan, Dept Agr & Environm Sci, I-20133 Milan, Italy. [Lutts, Stanley] Catholic Univ Louvain, Earth & Life Inst, GRPV, B-1348 Louvain La Neuve, Belgium. [Ghnaya, Tahar] Univ Gabes Erriadh City, Higher Inst Arts & Crafts Tataouine, Zrig Gabes 6072, Tunisia. Ghnaya, T (reprint author), Ctr Biotechnol Borj Cedria, Lab PlantesExtremophiles, BP 901, Hammam Lif 2050, Tunisia.; Ghnaya, T (reprint author), Univ Gabes Erriadh City, Higher Inst Arts & Crafts Tataouine, Zrig Gabes 6072, Tunisia. taoufik.amari@gmail.com; souid_aymen2008@yahoo.fr; Rimghabriche@gmail.com; Mauro.Porrini@unimi.it; stanley.lutts@uclouvain.be; gianattilo.sacchi@unimi.it; chedly.abdelly@gmail.com; tahar.ghnaya@gmail.com
29-Character Source Abbreviation Plants-Basel
Publication Date Mar
Year Published 2020
Volume 9
Issue 3
Digital Object Identifier (DOI) 10.3390/plants9030312
Unique Article Identifier WOS:000525315000061
Plants associated with this reference

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