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Preliminary report on epicuticular wax surface condition on stomata of Abies alba Mill. needles from Risnjak National Park in Croatia

100%

Bacic T., Popovic Z.

Acta Biologica Cracoviensia. Series Botanica

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1998

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tom 40

The structure of epicuticular wax on the stomata surface in both very young and one-year-old fir needles from Risnjak National Park in Croatia were examined with a scanning electron microscope. The stomata surface is first covered with wax crystalloids in the form of rodlets. In the course of time the rodlets become fused and agglomerated into amorphous wax crusts; this process begins very early. In addition to wax crystalloid quantitative estimation indicates a relatively large total amount of amorphous wax in very young needles (~20 days) and a very high percentage of amorphous wax crusts in one-year-old needles. Wax crusts cover stomatal pores in addition to the rims, making normal gas exchange impossible. The early start of wax degradation may be interpreted as a possible result of air pollution.

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Epicuticular wax on stomata of damaged silver fir trees [Abies alba Mill.]

80%

Bacic T., Krstin L., Rosa J., Popovic Z.

Acta Societatis Botanicorum Poloniae

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2005

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tom 74

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nr 2

Condition of epistomatal wax on the abaxial surface of the current and previous-year needles of damaged silver fir trees (Abies alba Mill.), both from the polluted Risnjak and "clean" Donja Dobra sites in Gorski Kotar region, both influenced by pollutants coming from Europe, during two years, three times a year, were examined with Scanning Electron Microscope. In the course of time the wax tubules on the epistomatal rims of stomata in polluted, but also in "clean" needles surface, become fused and agglomerated rapidly to various extents of morphologically different types of amorphous wax crusts, primarily compact and particulate ones. This process begins very early, especially in polluted Risnjak site, and may be interpreted as a possible result of air pollution. However, the recrystalization, or production of new tubules, also appears relatively quickly in mostly cases. Quantitative estimations indicate a very large total amount of amorphous wax crusts in the current-year needles, and a very high percentage of the same wax in previous-year needles. Amorphous wax crusts cover stomatal pores, as well as the rims, disturbing the normal gas exchange. Statistically there is a signicant tendency of increase in wax degradation in the needles of the polluted site in comparison with those of the unpolluted one, but there is an insignificant wax degradation among the needles of damaged trees within each site. These results confirmed most of the research done in our preliminary report.

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

71%

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

Acta Biologica Cracoviensia. Series Botanica

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2003

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tom 45

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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.

Ograniczanie wyników

2 Acta Biologica Cracoviensia. Series Botanica

1 Acta Societatis Botanicorum Poloniae

3 Bacic T.

3 Popovic Z.

2 Rosa J.

1 Grgic L.

1 Krstin L.

1 Uzarevic Z.

1 2005

1 2003

1 1998

Preliminary report on epicuticular wax surface condition on stomata of Abies alba Mill. needles from Risnjak National Park in Croatia

Epicuticular wax on stomata of damaged silver fir trees [Abies alba Mill.]

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