Abstract
Cell-free extracts from soft rots of potato tubers caused by Erwinia atroseptica and Corticium praticola readily caused cell separation and loss of electrolytes in discs of potato tubers. Both were most rapid at pH and Ca++ ion concentration optimal for the activity of a pectate trans-climinase in the E. atroseptica extract and a pectate polygalacturonase in the C. praticola rot extract. Permeability changes and killing of protoplasts but not cell separation were delayed when solutes at plasmolysing concentrations were added to the solutions of the cell-separating enzymes. The role of these enzymes in the permeability changes and killing of protoplasts is discussed.
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