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Publication Type J
Authors Slama, I., T. Ghnaya, A. Savoure and C. Abdelly
Title Combined effects of long-term salinity and soil drying on growth, water relations, nutrient status and proline accumulation of Sesuvium portulacastrum
Source Comptes Rendus Biologies
Author Keywords water-deficit stress; salinity; halophyte; Sesuvium portulacastrum; water-use efficiency; nutrient status; potassium use efficiency; proline drought stress; use efficiency; essential oils; plants; tolerance; deficits; salt; ultrastructure; environment; metabolism
Abstract The interaction between soil drying and salinity was studied in the perennial halophyte, Sesuvium portulacastrum. Rooted cuttings were individually cultivated for three months in silty-sandy soil under two irrigation modes: 100 and 25% of field capacity (FC). The amount of the evapotranspirated water was replaced by a nutrient solution containing either 0 or 100 MM NaCl. Whole-plant growth, leaf water content, leaf water potential (Psi(w)), and Na+, K+, and proline concentrations in the tissues were measured. When individually applied, both drought and salinity significantly restricted whole-plant growth, with a more marked effect of the former stress. However, the effects of the two stresses were not additive on whole-plant biomass or on leaf expansion. Root growth was more sensitive to salt than to soil drying, the latter being even magnified by the adverse impact of salinity. Leaf water content was significantly reduced following exposure to water-deficit stress, but was less affected in salt-treated plants. When simultaneously submitted to water-deficit stress and salinity, plants displayed higher values of water and potassium use efficiencies, leaf proline and Na+ concentrations, associated with lower leaf water potential (-1.87 MPa), suggesting the ability of S. portulacastrum to use Na+ and proline for osmotic adjustment.
Author Address Univ Paris 06, CNRS, UMR 7180, F-75252 Paris 05, France. Ctr Biotechnol, Lab Adaptat Plantes Stress Abiot, Hammam Lif 2050, Tunisia. Abdelly, C, Ctr Biotechnol, Lab Adaptat Plantes Stress Abiot, BP 901,Technopole Borj Cedria, Hammam Lif 2050, Tunisia. chedly.abdelly@cbbc.rnrt.tn
29-Character Source Abbreviation C. R. Biol.
Publication Date Jun
Year Published 2008
Volume 331
Issue 6
Beginning Page 442-451
Unique Article Identifier ISI:000256574000005
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