Assessment of salt tolerance of Nasturtium officinale R. Br. using physiological and biochemical parameters |
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Authors: | Rym Kaddour Emna Draoui Olfa Baâtour Hela Mahmoudi Imen Tarchoun Nawel Nasri Margaret Gruber Mokhtar Lachaâl |
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Affiliation: | 1. Physiologie et Biochimie de la Tolérance des Plantes aux Contraintes Abiotiques, Faculté des Sciences de Tunis, Campus Universitaire, 2090, Tunis, Tunisia 2. Saskatoon Research Centre, Agriculture and Agri-Food Canada, Saskatoon, SK, S7N0X2, Canada
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Abstract: | Nasturtium officinale R. Br. seedlings were treated with a range of NaCl concentrations (0, 50, 100 and 150 mM) for 21 days after seedling emergence. Physiological analysis based on growth and mineral nutrition, showed a substantial decrease in leaf dry matter with 150 mM NaCl treatment. The growth decrease was correlated with nutritional imbalance and a reduction in potassium accumulation and transport to the leaves. At the same time, we noted an increase in leaf sodium and chloride accumulation and transport. Salt tolerance of N. officinale under 100 mM NaCl was associated with osmotic adjustment via Na+ and Cl? and the maintenance of high K+/Na+ selectivity. Salt decreased carotenoid content more than chlorophylls and also disturbed membrane integrity by increasing malondialdehyde content and electrolyte leakage. At 150 mM NaCl, an increase in antioxidant enzyme-specific activities for superoxide dismutase, catalase and guaiacol peroxidase occurred in concert with a decrease in ascorbic acid, polyphenol, tannin and flavonoid content. These results indicate that N. officinale can maintain growth and natural antioxidant defense compounds such as, vitamin C, carotenoids, and polyphenols, when cultivated in 100 mM NaCl, but not at higher salt levels. |
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