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Publication Type J
Authors Messedi, D., N. Labidi, C. Grignon and C. Abdelly
Title Limits imposed by salt to the growth of the halophyte Sesuvium portulacastrum
Source Journal of Plant Nutrition and Soil Science-Zeitschrift Fur Pflanzenernahrung Und Bodenkunde
Author Keywords halophytes; Sesuvium portulacastrum; salt effect; nutrition status; split-root system accumulation; stress; plants; salinity; barley; nacl; physiology; tolerance; transport; injury
Abstract The growth of the halophyte Sesuvium portulacastrum, commonly known as sea purslane, is impeded by NaCl only at high (600- 1000 mM) concentration. Therefore, the goal of this investigation was to identify the mechanisms which set the limit of the salt resistance of S. portulacastrum. 21-day-old cuttings were grown for 45-50 d under split-root conditions in which one half of the root system was immersed in complete nutrient solution supplemented with 800 mM NaCl, while the other half was immersed in a NaCl-free medium, containing all nutrients or being deprived of potassium or calcium or nitrogen. Using this approach, we demonstrate that K+ and N uptake was impaired in roots exposed to NaCl. Concerning Ca2+, there was no indication of uptake inhibition by NaCl. However, restriction of K+ uptake by roots was compensated by an increase in the K+-use efficiency, so that growth was not inhibited. Concerning N, our analysis shows that NO3- and/or NH4+ uptake, but not their assimilation, was limited by salt treatment. Thus, we conclude that at high salinity levels, the growth of S. portulacastrum, is limited by the restrictions imposed by NaCl on N uptake, perhaps in addition to inhibiting effects of excessive Na+ accumulation in shoot.
Author Address INRST, Lab Adapt Plantes Stress Abiot, BP 95, Hammam Lif 2050, Tunisia INRST, Lab Adapt Plantes Stress Abiot, Hammam Lif 2050, Tunisia Agro M INRA, F-34060 Montpellier 1, France Abdelly C INRST, Lab Adapt Plantes Stress Abiot, BP 95, Hammam Lif 2050, Tunisia
29-Character Source Abbreviation J. Plant Nutr. Soil Sci.-Z. Pflanzenernahr. Bodenkd.
Publication Date Dec
Year Published 2004
Volume 167
Issue 6
Beginning Page 720-725
Unique Article Identifier ISI:000225871600009
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