Abstract
Erwinia salicis produced peroxidase, β-glucosidase, cellulase and pectinolytic enzymes in artificial media, but not polyphenoloxidase. The pectic enzyme produced by E. salicis (N.C.P.P.B. isolate Preece 14) was a constitutive rans-eliminase and using the thiobarbituric acid procedure was shown to have a pH optimum of 9·8 and to be Ca 2+ dependent. In healthy, uninoculated cricket bat willow wood extracts, peroxidase, polyphenoloxidase, β-glucosidase and cellulase activity was detected, but not pectinolytic enzymes. Wood with the watermark disease sympton following infection by E. salicis shows marked increase in peroxidase, β-glucosidase and cellulase and slight increase in polyphenoloxidase and polygalacturonate trans-eliminase.
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