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Publication Type J
Authors Benzarti, M., K. Ben Rejeb, A. Debez, D. Messedi and C. Abdelly
Title Photosynthetic activity and leaf antioxidative responses of Atriplex portulacoides subjected to extreme salinity
Source Acta Physiologiae Plantarum
Author Keywords Halophyte Oxidative stress Photosynthesis Pigments Salinity superoxide-dismutase photosystem-ii salt stress chlorophyll fluorescence physiological-responses glutathione-reductase cakile-maritima halophyte plants nacl
Abstract Responses of Atriplex portulacoides upon 40-day-long exposure to salinity (0-1,000 mM NaCl) were investigated. Mother plants originated from a sabkha located in a semi-arid region of Tunisia. The plant relative growth rate and leaf expansion increased significantly at 200 mM NaCl but decreased at higher salinities. Interestingly, the plants survived salinity as high as 1,000 mM NaCl without displaying salt-induced toxicity symptoms. Despite significant increase in leaf Na+ and Cl- concentrations upon salt treatment, no significant effect on leaf relative water content was registered. Chlorophyll contents and the gas exchange parameters showed a significant stimulation at the optimal salinity (200 mM NaCl) followed by a decline at higher salinities. Extreme salinity hardly impacted the maximal efficiency of photosystem II photochemistry (F (v)/F (m)), but a marked decrease in the relative quantum yield of photosystem II (Dcurrency sign(PSII)) was observed, along with a significant increase in non-photochemical quenching (NPQ). Leaf malondialdehyde and carotenoid contents were generally unaffected following salt exposure, whereas those of anthocyanins, polyphenols, and proline increased significantly, being maximal at 1,000 mM NaCl. Leaf superoxide dismutase (EC 1.15.1.1), ascorbate peroxidase (EC 1.11.1.11), and glutathione reductase (EC 1.6.4.2) activities were significantly stimulated by salinity, whereas catalase (EC 1.11.1.6) activity was maximal in the 0-400 mM NaCl range. As a whole, protecting the photosynthetic machinery from salt-induced photodamage together with the sustained antioxidant activity may account for the performance of A. portulacoides under high salinity.
Author Address [Benzarti, Maali; Ben Rejeb, Kilani; Debez, Ahmed; Messedi, Dorsaf; Abdelly, Chedly] Ctr Biotechnol Borj Cedria CBBC, Lab Plantes Extremophiles, Hammam Lif 2050, Tunisia. [Ben Rejeb, Kilani] Univ Paris 06, CNRS, EAC 7180, UR5,UPMC, F-75252 Paris 05, France. Abdelly, C (reprint author), Ctr Biotechnol Borj Cedria CBBC, Lab Plantes Extremophiles, BP 901, Hammam Lif 2050, Tunisia. chedly.abdelly@cbbc.rnrt.tn
ISSN 0137-5881
ISBN 0137-5881
29-Character Source Abbreviation Acta Physiol. Plant.
Publication Date Sep
Year Published 2012
Volume 34
Issue 5
Beginning Page 1679-1688
Digital Object Identifier (DOI) 10.1007/s11738-012-0963-5
Unique Article Identifier WOS:000307765600008
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