Abstract
We are studying the production of pectin methylesterase (PME), pectin polygalacturonase (PG), and pectin depolymerase (DP) by soft rot organisms and report here pectolytic enzymes produced by Botryosphaeria ribis Gross & Dug. and Penicillium italicumt Wehmer. There have been several reports concerning the apple fruit rot caused by B. ribis (4, 6, 8). Two types of fruit rot have been reported. Fenner (2) noted lesions similar to those of bitter rot. These lesions are circular and slightly sunken and the tissue becomes mushy. The second type is a post-harvest rot characterized by the rapid breakdown of tissue; the tissues may undergo dissolution even with no external evidence of the incitant.
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