Abstract
SUMMARYThe effect of various concentrations of sulphur dioxide (SO2) (0, 10, 100, 1000 p.p.m.) on the infrastructure of the Peltigera canina (L.) Willd ‐ Nostoc symbiosis was investigated in vitro. Ten days incubation with SO2 resulted in the following changes: decreasing number of carboxysomes, increasing number of cyanophycin granules and initiation of akinete‐differentiation. No changes were observed in the general arrangement of the thallus, the wall of either fungus or Nostoc cells, polyglucoside granules and polyphosphate bodies. A decrease in number of carboxysomes indicates a disturbance in photosynthetic ability of the lichen. It also appears that SO2 acts as a stress factor leading to akinete‐differentiation as evidenced by increased number of cyanophycin granules and appearance of akinetes.
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