Effect of salinity on nutrition water relations, and growth of three lemon rootstocks and two cultivars
1994
Jiastas, P.
Three lemon rootstocks, namely Citrus aurantium, C vokameriana and Citrumello and two lemon cultivars, Maglini and Difori, were tested for their tolerance to salinity, under greenhouse conditions. In the rootstocks experiment salinity was induced by NaC1 and CaCl2 combinations, starting from NaC12/CaC2=11.2/9mM and EC=4.9 reaching up to to 63.8/35.8 and EC=14.5 in the maximum salinity treatment, while in the cultivars experiment salinity was induced by 15, 30, 45 and 60mM Na2SO2 resulting in EC=11.2. Ionic content, dry weight, leaf number, stomatal resistance, water potential and evapotranspiration measurements were conducted. C. aurantium and Citrumello excluded Na ions from the leaves and young shoots while no control was found in the other plants. Also no control was implied by the results in CI distribution. Potassium content decreased in all plant parts but the leaves, where a control seems to exist, maintaining high K content, in all plants tested. Calcium increased in the rootstocks case, and decreased in the cultivars. Magnesium also decreased in all plants, while Zn and Mn were found to increase in some cases only, while small differences were found in iron content. Phosphorus slightly increased in C. aurantium and in the cultivars case, while it decreased in the other plants. Stomatal resistance increased in all cases, while evapotranspiration measured in the rootstocks experiment decreased. Leaf water potential, measured in the cultivars experiment increased, implying a form of adaptation of the cultivars. leaf and shoot dry weights were disproportionate to salinity in most cases and the same result was obtained for leaf number in all plants.
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