Salinity tolerance of hydroponically grown <Emphasis Type="Italic">Pinus pinea</Emphasis> L. seedlings |
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| Authors: | Abdelhamid Khaldi Rebai Ben Ammar Su Young Woo Noureddine Akrimi Ezzeddine Zid |
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| Institution: | (1) Unit of Research on Management and Valorization of Forest Resources, National Institute of Research on Rural Engineering, Water and Forests, INRGREF-BP 10, 2080 Ariana, Tunisia;(2) Unit of Ecophysiology and Plant Nutrition, Department of Biology, Faculty of Sciences of Tunis, University of Tunis-El-Manar, 1060 Tunis, Tunisia;(3) Department of Environmental Horticulture, University of Seoul, Seoul, 130-743, Korea;(4) Department of GREF, National Institute of Agronomy of Tunisia, 43, Street of Charles Nicolle, 1082 Tunis, Tunisia;(5) Department of Bioactive Substances, Center of Biotechnology of Borj Cedria, PB 901, 2050 Hammam-Lif, Tunisia |
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| Abstract: | The salinity tolerance and ion transport of 2-month-old seedlings of stone pine (Pinus pinea L.) grown in hydroponic solution containing various concentrations of NaCl (0–100 mM) were studied. The presence of salt
of up to 100 mM did not significantly reduce growth. Seedling hydration was insensitive to salinity. High salt concentrations
reduced K+ and Ca2+ uptake, root accumulation, and export to shoots. Na+ and Cl? ions, representing the major part of the ionic uptake, were effectively compartmentalized in vacuoles. We concluded that
seedlings of stone pine cultivated hydroponically were highly tolerant to salt concentrations of up to 100 mM for a culture
period of 38 days. This tolerance was associated with the accumulation of Na+ and Cl? ions in the shoots. |
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