1985 Volume 20 Issue 1 Pages 40-45
Parmelia tinctorum was fumigated for 48 hr with NO (0.18-0.56 ppm), NO2 (0.20 ppm) and SO2 (0.1 ppm) singly and in combinations. And their chlorophyll contents, activities of catalase and peroxidase were assayed in comparison with those of the control.
The result were as follows:
(1) Single effect of NO
Activities of catalase and peroxidase slightly increased with NO singly fumigated, but both the change of chlorophyll content and visible injury of thallus were not found.
(2) Effect of NO combined
The decrease of peroxidase activity caused by NO2 alone was counteracted with NO combined. And the increase of the activity by SO2 alone was accelerated in the combination of SO2+NO.
The increase of catalase activity caused by NO2 alone was counteracted with NO combined. And the decrease of the activity by SO2 alone was also counteracted with NO.
Visible symptoms of damage were not found in any gas exposures.
