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2 Acta Biologica Cracoviensia. Series Botanica

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TEM investigation of tannins and chloroplast structure in needles of damaged silver fir trees [Abies alba Mill.]

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Bacic T. , Ljubesic N. , Uzarevic Z. , Grgic L. , Rosa J.

Acta Biologica Cracoviensia. Series Botanica

2004

tom 46

145-149

As part of investigations on the effect of air pollution on plant anatomy, we examined the condition of tannins and chloroplast structure in damaged fir trees (Abies alba Mill.) at Risnjak National Park. Two populations were chosen for needles sampling: one at the Risnjak site with trees having 20%, 45% and 85% damage, and the other at the Donja Dobra site (control locality) with relatively healthy trees having 5% to 10% damage. Current and previous-year needles were fixed with glutaraldehyde and osmium tetroxide, and then the condition or ultrastructure of tannins and chloroplasts were examined by transmission electron microscopy (TEM). The tannins were shown to be granular and arranged in thin or thick ribbons. The chloroplasts were first somewhat rounded and then round or irregular in shape, with reduced and swollen thylakoids, especially those of the grana, increased numbers of plastoglobuli, large lipid droplets/accumulations, and vesiculation of the cytoplasm. These symptoms were more frequent in previous-year than in current-year needles. All these alterations can be attributed to air pollution.

Chlorophylls and carotenoids in needles of damaged fir [Abies alba Mill.] from Risnjak National Park in Croatia

100%

Bacic T. , Uzarevic Z. , Grgic L. , Rosa J. , Popovic Z.

Acta Biologica Cracoviensia. Series Botanica

2003

tom 45

nr 2

Chlorophyll and carotenoid content was studied in needles of damaged silver fir (Abies alba Mill.) trees growing in a polluted habitat, Risnjak National Park, and of almost undamaged ones growing at a much less polluted site, Donja Dobra, both locations in the Gorski Kotar region. Chlorophyll a and b, total chlorophylls and carotenoids were lower in needles from the polluted Risnjak site than in those from the unpolluted Donja Dobra site. The data indicate an increase of pigment content over the course of a year; and somewhat smaller content in the first in comparison with the second experimental year. The chlorophyll a:b ratios varied independently of pollution level and locality.