Journal
JOURNAL OF PLANT NUTRITION
Volume 29, Issue 11, Pages 2063-2078Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01904160600932682
Keywords
salinity; photosynthesis; water relations; potassium; carbohydrates; olive
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The effects of saline water containing 0, 50, 100, and 150 mM sodium chloride (NaCl), and 100 mM NaCl + 100 mM potassium (K) on photosynthesis, water relations, and ion and carbohydrate content of olive (Olea europaea L.) cultivars 'Koroneiki' and 'Mastoidis' were studied on five-year-old trees. Salinity increased sodium (Na+) and chloride (Cl-) in tissues of both cultivars, but more so in 'Koroneiki' than in 'Mastoidis.' Salt-toxicity symptoms were observed at 100 and 150 mM, but not in plants receiving extra K. In salt-stressed plants, leaf water potential declined, whereas turgor potential remained positive due to a rapid decrease in osmotic potential. Salinity increased mannitol content up to 41.3% in 'Mastoidis' and 15.8% in 'Koroneiki', but reduced starch content in leaves. Photosynthetic rates fell significantly with increasing salinity in both cultivars, but more so in ` Koroneiki' than in 'Mastoidis'. Potassium supplements reduced the concentration of Na+ and increased the concentrations of K+ in leaves, but decreased photosynthesis.
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