Effects of Air Pollution on Stomatal Responses, Including Paleoatmospheric CO2 Concentration, in Leaves of Hedera helix


1Biology Department, Faculty of Technical Sciences, University of “Ismail Qemali” Vlore, Albania

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Stomata, small holes in the epidermal surface of the leaves, are important organs in plant phylogenetic relationship studies, responsible for exchanging CO2 and transpiration. They are easily affected by external environmental conditions. Leaf stomata in different plants, from generation to generation, possess significantly different characteristics such as density, size, and shape. Consider that, bivariate correlation and descriptive statistics was performed in this study, aming to detect significant differences for stomatal density (stomata per mm2) and stomatal morphologic parameters obtained from plants growing in ambient and elevated CO2 treatments. We have chosen Hedera helix plant to examine stomatal density (stomata per mm2), long axis length (length), and short axis length (width), evaluating at once even the status of environment in different area in Vlora city, Albania. The plant material (leaves) was collected in urban and rural populations growing in a free pollution environment near the village of Drashovic, Vlore and in urban agglomeration in Vlora city. In terms of the rensponses of stomata width and density to CO2 enrichment, we noticed asignificant positive correlation and decrease of those parameters. Whereas CO2 elevation does not affect the length of stomata in our research. Given that the increase of CO2 concentration in atmosphere is associated with a decrease in Stomata Density, we estimated that rural environment is less polluted than urban one.These results indicate that simulated climate change influences leaves structure and function somehow.

Keywords: Hedera helix; CO2; stomata density, stomata morphological parameters.