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KMID : 0379119880160020064
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Korean Journal of Mycology
1988 Volume.16 No. 2 p.64 ~ p.69
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Original Production of Pectolytic enzymes by Alternaria mali Roberts
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Abstract
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Isoates with changed pathogenicity were selected among iprodione-resistant Alternaria mali to investigate any relationship between their pectolytic enzyme activity and pathogenicity. In artificial medium, strongly pathogenic isolates S₁ and R₃ showed higher enzyme activity than weakly pathogenic isolate R_8. Activity of endo-polymethylgalacturonase and endo-polygalacturonase was more than 3 times. But activity of pectin methylesterase and pectin lyase by isolaste S₁ was higher than those by R₃ and R_8 isolates. In apple medium dialyzed against distilled water, activity of enzyme by each isolate was increased but growth of each isolate was reduced. When iprodione was added to the medium, enzyme activity and growth of isolate S₁ were reduced but strongly pathogenic isolate. R₃ among iprodione-resistant ones showed increased enzyme activity except for exo-polygalacturonase in dialyzed apple medium.
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