Enzymic changes associated with induced and natural resistance of sweetpotato to ceratocystis fimbriata

Enzymic changes associated with induced and natural resistance of sweetpotato to ceratocystis fimbriata

1967

A:PS

Tissue from resistant or susceptible varieties of sweetpotato (Ipomoea batatas) was treated on cut surfaces with a culture medium or inoculated with isolates of Ceratocystis fimbriata. Some isolates were pathogenic to sweetpotato and some were not. Some of the nonpathogenic isolates induced resistance in susceptible tissue. The changes in isoenzyme paterns below the treated surfaces were similar in inoculated tissue with natural or induced resistance and differed from those in inoculated susceptible tissue. Peroxidase, polyphenoloxidase, and acid phosphatase activities increased in resistant tissue. Malic dehydrogenase and glucose-6-phosphate dehydrogenase activities decreased; alkaline phosphatase and esterase activities decreased or did not change. [AS]

v.57(4):421-424, PHYTOPATHOLOGY

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