Summary: Changes in multiple forms of acid phosphatase from potato tubers during infection by were detected by polyacrylamide gel electrophoresis. In recently lifted tubers these changes included the appearance of a new molecular form of low electrophoretic mobility. Seasonal studies established that a similar molecular form developed in healthy tubers during storage. An antiserum to acid phosphatase from potato tubers was shown to be specific for the host enzyme. Utilizing a sectional immunofocusing procedure the novel molecular form from infected tissues cross-reacted with the antiserum, suggesting that this component originated from the host.


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