ISHS Acta Horticulturae 474: III International Symposium on Olive Growing
A REVIEW ON SALINITY-INDUCED CHANGES IN LEAF GAS EXCHANGE PARAMETERS OF OLIVE PLANTS |
| Authors: | M. Tattini, L. Marzi, R. Tafani, M.L. Traversi |
| Keywords: | olive, salinity stress |
| Abstract:
Self rooted olive (Olea europaea L.) plants were exposed to salinity treatments up to 200 mM external NaCl during two years of experiments. Leaf gas exchange parameters were decreased by salinity treatments; stomatal limitations were prevailing at middle range salinity stress (up to 100 mM NaCl for 5 weeks), whereas biochemical limitations were predominant when both duration and concentration of the salinity treatment increased (200 mM external NaCl for 5 weeks). There was not a relationship between leaf salt accumulation and reduction in leaf gas exchange parameters. Reductions in photosynthetic rate and stomatal conductance were more pronounced in a salt-excluding genotype than in a salt-accumulating genotype, at 100 mM external NaCl. Net assimilation rate recovered in salinized plants during the relief period, despite high concentrations of Na+ and Cl- in the leaves. It seems that the salinity-induced osmotic/water stress plays a central role in regulating leaf gas exchange characteristics of salinized olive plants. | |
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