Abstract
Polygalacturonase is produced by the cyanolichen Peltigera canina . In cell free extracts of thalli, enzyme activity was detected in the soluble fraction and in the cell wall. Polygalacturonase was also secreted to the incubation medium. Three forms of the enzyme differing in isoelectric point were detected. One form, with pI around 6.0, appeared in soluble and cell wall fractions and also was secreted to the incubation medium. Two other forms were detected, one in the soluble fraction, whose pI is around 5.0, and the other in the cell wall fraction, with pI 7,0. These results are discussed considering the different cell wall composition of the symbionts and the fact that Peltigera canina is tightly joined to the tissues of mosses, on which it grows.
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