Summary
Potted cuttings of a 12-year-old Picea abies tree were fumigated with ozone, 100 or 300 μg O3· m−3 (50 or 150 ppb O3) being added to charcoal-filtered air during the 1985 growing season for a total of 1215 h. The wax structure of ozone-fumigated needles was no different from that of controls. Because flattened wax structures and fused wax fibrils also occurred in controls, these phenomena could not serve as bioindications for the ozone concentrations applied. A smooth layer was found beneath the soluble wax layer and covered needle surface and stomatal openings of ozone-fumigated needles to a greater extent than in controls. Wax quantity was considerably reduced by fumigation with 300 μg O3 · m−3. Leaf pigments (as extracted with the wax) were less abundant in needles treated with 300 μgO3; the smooth layer probably contributed to the impeded extraction of pigments.
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Günthardt-Goerg, M.S., Keller, T. Some effects of long-term ozone fumigation on Norway spruce. Trees 1, 145–150 (1987). https://doi.org/10.1007/BF00193557
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DOI: https://doi.org/10.1007/BF00193557