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Studies in the physiology of parasitism. XVI. Effect of the condition of potato tissue, as modified by temperature and water-content, upon attack by certain organisms and their pectinase enzymes



Studies in the physiology of parasitism. XVI. Effect of the condition of potato tissue, as modified by temperature and water-content, upon attack by certain organisms and their pectinase enzymes



Ann Botany 16(61): 103-114



Certain bacteria that are normally termed saprophytic, as Bacillus subtilis and B megatherium, are able to parasitize living potato tissue at a suitably high temp. or when the tissue is injected with water. Within the group of 4 bacteria tested, there is a correlation between capacity to attack potato tissue and amt. of pectinase enzyme excreted under standard conditions. A qualitative difference between the pectinase enzymes of Botrytis cinerea and Bacterium carotovorum was demonstrated. Prepns. of the bacterial enzyme which,when tested on turgid potato discs of standard thickness, were found to be weaker than Botrvtis enzyme, failed to do so. No explanation of this difference is yet forthcoming. It does not seem to rest upon osmotic differences between the 2 enzymic prepns. Rate of diffusion appears to be a limiting factor in the attack of potato tissue by prepns. of pectinase enzyme.

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