engleski

Stanje epikutikularnog voska na epistomatalnom obrubu puči na abaksijalnoj strani iglica jele (Abies alba Mill.)

Abaxial wax surface of stomata in the current and previous-year needles of silver fir trees (Abies alba Mill.), both from the polluted and unpolluted sites, during two years, were examined with Scanning Electron Microscope. In the course of time the wax rodlets on the epistomatal rims of stomata on abaxial side in polluted and also in unpolluted needles surface become fused and agglomerated to various extents of morphologically different types of amorphous wax crusts, primarily compact and particulate ones. This process begins very early, particularly in the polluted Risnjak site, and may be interpreted as a possible result of air pollution. Quantitative estimations indicate a very large total amount of amorphous wax crusts in the current-year needles, and a very high percentage of the amorphous wax in previous-year needles. Also, amorphous wax crusts cover stomatal pores, making the normal gas exchange impossible. Statistically there is a significant tendency of increase in wax degradation in the needles of the polluted site, but there is an insignificant wax degradation among the needles of damaged trees within each site.

polluted site; Risnjak; SEM

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