Comparative study on NACL salinity tolerance of six olive cultivars
2002
Chartzoulakis, K. | Loupassaki, M. | Androulakis, I.
The effects of NaCl salinity on the growth of six olive cultivars (Koroneiki, Mastoidis, Kalamata, Amphissis, Kothreiki and Megaritiki) were studied. The plants were grown in 8.5 l pots containing sand-perlite mixture (1:3) for five months and were irrigated with half-strength Hoagland solution containing 0, 25, 50, 100 and 200 mM NaCl. Shoot length was reduced significantly above 50 mM NaCl in all cultivars. Total plant leaf area was reduced significantly above 25 mM NaCl, reaching 85% at 200 mM NaCl for the cultivars Mastoidis and Amphissis, due to defoliation. The above ground part of the plants was more depressed than the root by the increase of salinity in the rooting medium. The concentration of Na and Cl (% d.w.) was higher in roots than in other parts of the plant (shoots and leaves), and increased with the increase of salinity. In Kalamata, leaf Na and Cl concentration was very low for all salinity treatments. Salt injury symptoms (leaf tip burning) appeared in Koroneiki, Amphissis and Mastoidis at 100 mM NaCl, becoming more severe at 200 mM due to defoliation. The cultivars Kothreiki and Megaritiki at 200 mM NaCl exhibited only a few symptoms, while in Kalamata no injury was observed.
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