Abstract
Sclerotinia fructigena Aderh. and Ruhl. causes a firm, brown rot of apple fruit. When the fungus is grown in a synthetic medium, active polygalacturonase and pectin-methylesterase can be detected in the culture filtrate. However, examination of Bramley's Seedling apples rotted by the fungus revealed that although the total pectic substances of the tissue insoluble in water had been reduced by 10 per cent and a small amount of galacturonic acid formed, only a trace of polygalacturonase activity could be detected; pectin-methylesterase activity was found. An explanation for the absence of polygalacturonase activity in rotted tissue was sought.
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COLE, M. Oxidation Products of Leuco-anthocyanins as Inhibitors of Fungal Polygalacturonase in Rotting Apple Fruit. Nature 181, 1596–1597 (1958). https://doi.org/10.1038/1811596a0
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DOI: https://doi.org/10.1038/1811596a0
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