Calcium increases sodium exclusion in olive plants |
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Authors: | JC Melgar M BenllochR Fernández-Escobar |
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Institution: | Departamento de Agronomía, Universidad de Córdoba. Edificio ‘Celestino Mutis’, Campus Universitario de Rabanales, Ctra. Madrid-Cádiz km. 396, Córdoba 14071, Spain |
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Abstract: | ‘Picual’ olive cuttings were grown in a greenhouse under saline conditions in 2 L plastic pots containing perlite. Plants were irrigated with a nutrient solution plus 75 mM NaCl and 0, 2.5, 10 or 40 mM CaCl2. Vegetative growth, leaf and root Na+ and Ca2+ concentrations were measured. Na+ toxicity symptoms were observed in plants non-treated with Ca2+. Shoot length was higher in Ca2+ treated plants, although shoot growth was reduced at 40 mM CaCl2, probably due to the high total ion concentration reached in the external solution. Ca2+ supply linearly increased leaf and root Ca2+ concentration and decreased leaf Na+ concentration. However, there were no differences in root Na+ concentration. Results indicate Ca2+ may take part in the Na+ exclusion mechanism, mainly preventing Na+ transport to the shoot, that may be an important ability for survival under saline conditions. |
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Keywords: | Olea europaea NaCl Sodium exclusion Calcium |
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