ISHS Acta Horticulturae 773: XXVII International Horticultural Congress - IHC2006: International Symposium on Citrus and Other Tropical and Subtropical Fruit Crops
EFFECT OF NACL ON GROWTH AND ION CONTENT OF FIVE OLIVE CULTIVARS |
| Authors: | H. Lessani, M. Rezaei, A. Talaei, M. Babalar |
| Keywords: | salinity, stress, selection index, cation concentration, toxic ion |
| Abstract:
In order to study the effect of NaCl salinity stress on the growth and ion content of five olive cultivars, an experiment was conducted in split-plot arrangement following CRD with three replications. In this study, the main factor was four levels of NaCl such as 0, 25, 50 and 100 mM NaCl, and the sub-factor was the five olive cultivars namely, ‘Dezfuli’, ‘Conservalia’, ‘Fishomi’, ‘Zard’, and ‘Manzanila’. The uniform 1-year-old plants were transplanted in 20 L pots containing sand-perlite mixture (1:1) and were irrigated with half-strength Coic solution. Salinity treatment was applied for five months. Results showed that growth indicators entirely decreased during stress condition and NaCl salinity generally reduced plant growth, especially the above ground parts of the plants. The K+, Ca2+, Mg2+ cation concentration decreased during NaCl salinity stress and cation concentrations in the roots decreased more than those in the other parts of the plant. Salinity had no significant effect on N and P uptake. The concentration of Na+ and Cl- (DW %) in roots were higher than in other parts of plants (shoots and leaves) and increased with increasing salinity. Large genotypic differences were detected on Na+ transport to above ground parts (shoots and leaves). The result clearly showed that among the five olive cultivars studied, ‘Dezfuli’ and ‘Conservalia’ possessed the effective salt exclusion mechanism operating in the root system. | |
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