Correlation of Virulence with Secretion in vitro of Three Wall-degrading Enzymes in Isolates of Sclerotinia fructigena Obtained after Mutagen Treatment
Summary: Correlation and regression analyses were carried out between the virulence (expressed as growth rate in apple fruits) and the secretion in vitro of three host wall-degrading enzymes by 119 isolates of Sclerotinia fructigena, most of which had been obtained following exposure of conidia to N-methyl-N-nitro-N-nitroso-guanidine. Virulence was found to be significantly correlated (P < 0·01) with α-l-arabinofuranosidase, but not with pectin esterase or, where enzyme inter-dependence had been statistically eliminated, with polygalacturonase. Approximtely 35% of the total variability in virulence could be accounted for in terms of the three enzymes.
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Correlation of Virulence with Secretion in vitro of Three Wall-degrading Enzymes in Isolates of Sclerotinia fructigena Obtained after Mutagen Treatment