Abstract
This study refers to the observation of Leyton and Juniper, (9) that the Scots pine needle bases surrounded by multiple layers of dead scales can absorb water from dew or mist. It is suggested that this ability provides an additional site of entry for toxins originating from air pollutants. In connection with this hypothesis investigations were carried out on the dwarf shoots of Pinus sylvestris L. trees growing in different areas along an air pollution gradient. The damages to the needles, the ‘weathering’ of the sheath scale surrounding the base of the dwarf shoots, and the decay of surface cells in the basal part of the shoot apex in the axil of the needles and on the adaxial surface of the needles were measured. All of them were exacerbated by increased pollution.
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