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Publication Type J
Authors Jdey, A., I. Slama, A. Rouached and C. Abdelly
Title Growth, Na+, K+, osmolyte accumulation and lipid membrane peroxidation of two provenances of Cakile maritima during water deficit stress and subsequent recovery
Source Flora
Author Keywords Cakile maritima Provenances Water deficit stress Growth Osmotic adjustment Recovery osmotic adjustment sesuvium-portulacastrum proline metabolism abiotic stress plants salinity drought photosynthesis adaptation contribute
Abstract The effects of water deficit stress on growth, Na+, K+ and osmolyte accumulation in the halophyte species Cakile maritima were investigated. Two Tunisian provenances, Tabarka and Chaffar, belonging to different bioclimatic stages, humid and arid, respectively, were compared. After germination, thirty-day-old seedlings were cultivated for 4 weeks under optimal or limiting water supply, at 100% and 25% of field capacity (FC), respectively. A subset of stressed plants was thereafter rehydrated. The final harvest was carried out after 60 days of treatment. Upon water deficit stress, Chaffar provenance showed significantly lower reduction in biomass production, net CO2 assimilation and stomatal conductance as well as of leaf water content. Leaf malondialdehyde (MDA) content was significantly increased in the two provenances but this effect was more pronounced in Tabarka plants than in Chaffar ones. Several criteria seem to be associated with the relative tolerance of Chaffar to water deficit: a slow growth rate, a greater ability to control photosynthetic gas exchange, a high ability to preferentially allocate photoassimilates to its roots, and a greater capacity for osmotic adjustment ensured by K+ and some compatible solutes such as proline and glycine betaine, but not soluble sugars. The superiority of Chaffar provenance also appeared at the level of its ability to recover after a severe water deficit stress (irrigation at 25% FC only during one month). The data suggest that compatible osmolytes (proline and glycine betaine) accumulated upon water deficit stress play important roles in this halophyte, being involved not only in osmotic adjustment but probably serving also in preservation of the structural and functional integrity at the cellular level during water deficit. (C) 2013 Elsevier GmbH. All rights reserved.
Author Address [Jdey, Asma; Slama, Ines; Rouached, Aida; Abdelly, Chedly] Technopole Borj Cedria, Ctr Biotechnol, Lab Plantes Extremophiles, Hammam Lif 2050, Tunisia. Abdelly, C (reprint author), Technopole Borj Cedria, Ctr Biotechnol, Lab Plantes Extremophiles, BP 901, Hammam Lif 2050, Tunisia. chedly.abdelly@gmail.com
ISSN 0367-2530
ISBN 0367-2530
29-Character Source Abbreviation Flora
Year Published 2014
Volume 209
Issue 1
Beginning Page 54-62
Digital Object Identifier (DOI) 10.1016/j.flora.2013.10.002
Unique Article Identifier WOS:000330928600007
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