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Structural changes in silver fir needles in response to air pollution

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Author(s): Irina GOSTIN

Journal: Analele Universitatii din Oradea, Fascicula Biologie
ISSN 1224-5119

Volume: TOM XVII;
Issue: 2;
Start page: 300;
Date: 2010;
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Keywords: anatomy | heavy metals | leaf | pollution | Abies alba Mill.

ABSTRACT
In this paper the structure of the two years old silver fir leaves from polluted and clean sites was comparatively investigated. Under the action of heavy metals (especially Pb, Cu and Zn), important accumulations of tannin and polyphenolic compounds were noticed in epidermis and hypodermis cells and in assimilatory tissues. The transfusion parenchyma was severely affected in some needles of plants growing in polluted areas. With some exceptions, the epidermis preserves its integrity. The conductive tissues, especially the phloem, are affected by the pollutants. These features suggest a massive translocation of heavy metals through the vascular bundles. The micromorphological investigations show different degrees of degradation of wax tubules from the epistomatal ring. The amorphous wax could be observed on the needles from polluted sites.
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