Morpho-anatomical changes in Quercus rubra L. leaf under pollution conditions
by Săvulescu E., Delian E., Luchian V., Chira C.-L. (2009)
Elena Săvulescu, Elena Delian, Vasilica Luchian, Constantina-Lenuţa Chira
University of Agronomical Sciences and Veterinary Medicine Bucharest
Atmospheric pollution affects some plant species. Besides resistant species to this abiotic stress factor there is Quercus rubra with a specific cyto-histological leaf configuration.
Of this species, mature leaves were randomly collected from polluted and non-polluted habitats in Bucharest City and cross-sections have been carried out in leaf and petiole.
Following the microscopic observations and specific measurements it can be noticed that there is a higher stomata number on the leaf epidermis of samples from polluted area.
The leaf mesophyll was thinner in the case of polluted leaves. The leaf shows secondary formations in the principal nerve. In the petiole there are collateral-open type phloem-xylem vascular bundles.
In the median nerve of some polluted leaves there are two vascular bundles, as opposite to other samples with only one vascular bundle.
In the median nerve of some unpolluted leaves, we observed lenticels, an uncharacteristic formation for leaves. No significant differences between polluted and unpolluted leaves, regarding the leaf area, were registered.