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Publication Type J
Authors Nedjimi, B.
Title Effects of salinity on growth, membrane permeability and root hydraulic conductivity in three saltbush species
Source Biochemical Systematics and Ecology
Author Keywords Atriplex Halophyte Soil rehabilitation Osmotic adjustment Salt stress water relations proline accumulation perennial halophyte mediterranean basin osmotic adjustment nutrient-uptake nacl-salinity tomato plants tolerance stress
Abstract The species of the genus Atriplex have been introduced in West Asia and North Africa to determine their adaptability for use as fodder species. These halophytes are well adapted to extreme environmental conditions and may possess interesting properties for soil rehabilitation. The effect of NaCl stress on growth, water relation and mineral nutrition were investigated in three xero-halophyte species of Atriplex used for rehabilitation of arid steppe in Algeria. Atriplex halimus, Atriplex canescens and Atriplex nummularia, were cultivated in hydroponic conditions and treated with increasing doses of NaCl (0-300 mM). All species showed positive plant growth for low and moderate levels of salinity. A. halimus had higher dry weight production than A. nummularia and A. canescens in high salinity concentration. Increasing concentration of salinity induced decrease in chlorophyll content (Chl a and b) and root hydraulic conductivity (Lo) in all species, especially in A. canescens. All three species showed marked increase in electrolyte leakage across the salinity gradient. In addition all species were able to accumulate a large quantity of sodium (Na), chloride (Cl) and proline and to maintain higher relative water content, which was probably associated with a greater capacity for osmotic adjustment, whereas potassium (K) and calcium (Ca) decreased with increase salinity. The data suggest that salt tolerance strategies in all Atriplex species could involve a delicate balance among ion accumulation, osmotic adjustment, production of osmotica and maintenance of relative water content and growth. (c) 2013 Elsevier Ltd. All rights reserved.
Author Address Univ Djelfa, Fac Sci Nat & Vie, Lab Explorat & Valorisat Ecosyst Stepp, Djelfa 17000, Algeria. Nedjimi, B (reprint author), Univ Djelfa, Fac Sci Nat & Vie, Lab Explorat & Valorisat Ecosyst Stepp, Cite Chih,BP 3117, Djelfa 17000, Algeria. bnedjimi@yahoo.fr
ISSN 0305-1978
ISBN 0305-1978
29-Character Source Abbreviation Biochem. Syst. Ecol.
Publication Date Feb
Year Published 2014
Volume 52
Beginning Page 4-13
Digital Object Identifier (DOI) 10.1016/j.bse.2013.10.007
Unique Article Identifier WOS:000334138500002
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