Abstract
Scots pine (Pinus sylvestris L.) seedlings were fumigated with 1.2–1.5 x ambient ozone over 2 seasons in an open-air experiment. Fumigation started in the early spring and continued into late autumn during both years. Needle and root cell structures were analyzed in the summer, autumn and early winter following the second fumigation period. Under the light microscope an increase in the intercellular space and disintegrating cells in the mesophyll tissue near the stomata and stomatal cavities were observed in the ozone-exposed needles. Darkening of chloroplast stroma, increased plastoglobulus size and decreased chloroplast size were characteristic ultrastructural changes associated with ozone exposure. In addition, less dense grouping of the chloroplasts in the needles of elevated ozone-exposed seedlings as compared to the controls (background ozone) was observed in the early winter. Fewer starch grains and an increased accumulation of tannin-like substances were detected in both mycorrhizal and uninfected roots of ozone-exposed seedlings as compared to the control seedlings. For the first time, we were able to show that the ozone-induced darkening of needle chloroplast stroma is a reversible symptom. An increased frequency of frost injury symptoms indicated that the winter hardening process was disturbed in the needles of ozone-treated seedlings.
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Anttonen, S., Kärenlampi, L. Slightly elevated ozone exposure causes cell structural changes in needles and roots of Scots pine. Trees 10, 207–217 (1996). https://doi.org/10.1007/BF02185671
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DOI: https://doi.org/10.1007/BF02185671