Loading content, please wait..
loading..
Logo
Version 3.19
or
Publication Type J
Authors Benzarti, M., K. Ben Rejeb, D. Messedi, C. Abdelly and A. Debez
Title Involvement of nitrogen in salt resistance of Atriplex portulacoides is supported by split-root experiment data and exogenous application of N-rich compounds
Source Journal of Plant Nutrition and Soil Science
Author Keywords halophyte salinity split-root system nitrogen photosynthetic nitrogen-use efficiency WHEAT TRITICUM-AESTIVUM WATER-STRESS SALINITY TOLERANCE GAS-EXCHANGE THIOUREA GROWTH UREA TEMPERATURE HALOPHYTES METABOLISM
Abstract Using a split-root system, we aimed to identify the limiting factors for the growth of the halophyte Atriplex portulacoides L. under extreme salinity (800 mM NaCl) conditions. One half of the root system was immersed in complete nutrient solution at 0 or 800 mM NaCl and the other half was immersed in NaCl-free medium, containing all nutrients or deprived of potassium (K+) or calcium (Ca2+) or nitrogen (N). Data indicate that at high salinity levels A. portulacoides growth is limited by the restrictions imposed by NaCl on N uptake. Next, the alleviation of the adverse impact by salt stress (800 mM NaCl) on plant growth was investigated through urea (U) and/or thiourea (TU) external addition through foliar application. Whether separately or supplied together, both components mitigated the negative impact of salinity on the plant growth by significantly improving the photosynthetic activity parameters [CO2 assimilation rate, stomatal conductance and maximum quantum efficiency of PSII photochemistry (F-v/F-m)], as well as shoot N concentration and the photosynthetic nitrogen-use efficiency (PNUE). A concomitant increase of protein and free amino acid concentrations was also observed. As a whole, the present study highlights the significance of N in A. portulacoides response to high salinity and suggests that combined application of U and TU could promote the growth of this halophyte potentially useful for saline soil reclamation and revegetation purposes.
Author Address [Benzarti, Maali; Ben Rejeb, Kilani; Messedi, Dorsaf; Abdelly, Chedly; Debez, Ahmed] CBBC, Lab Plantes Extremophiles, Hammam Lif 2050, Tunisia. [Ben Rejeb, Kilani] Univ Paris 06, Adaptat Plantes Contraintes Environm, UR5, F-75252 Paris 05, France. Benzarti, M (reprint author), CBBC, Lab Plantes Extremophiles, BP 901, Hammam Lif 2050, Tunisia. maali23@yahoo.fr
ISSN 1436-8730
ISBN 1436-8730
29-Character Source Abbreviation J. Plant Nutr. Soil Sci.
Publication Date Apr
Year Published 2015
Volume 178
Issue 2
Beginning Page 312-319
Digital Object Identifier (DOI) 10.1002/jpln.201400418
Unique Article Identifier WOS:000352570800018
Plants associated with this reference

LEGAL NOTICES — This website is protected by Copyright © The University of Sussex, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019. The eHALOPH database is protected by Database Right and Copyright © The University of Sussex and other contributors, 2006, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019. This database is based on an earlier work by James Aronson.
THIS WEBSITE AND THIS DATABASE ARE PROVIDED ON AN "AS IS" BASIS, AND YOU USE THEM AND RELY ON THEM AT YOUR OWN RISK.

Contact email: halophytes@sussex.ac.uk
Credits – Tim Flowers, Joaquim Santos, Moritz Jahns, Brian Warburton, Peter Reed