Abstract
Scotch pine cotyledons, primary needles, and secondary needles of various ages were exposed to 2620 ..mu..g/m/sup 3/ (1.0 ppm) SO/sub 2/ for 1, 3, or 5 hr. Needles from unexposed (control) and exposed plants were embedded in paraffin, sectioned, stained, and examined under a light microscope. Mesophyll collapse was the most common structural change induced by SO/sub 2/ in all three needle types. Resin canal occlusion also was observed in primary and secondary needles exposed to SO/sub 2/. Increased dosages of SO/sub 2/ did not induce additional symptoms but intensified those already present.
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