Abstract
Naphthyl acetate esterase (NAE) of leaves of Festuca pratensis had an apparent MW of 55000. Five major NAE isoenzymes were resolved by gel electrophoresis. During leaf senescence the proportions of these isoenzymes altered and two novel isoenzymes became active. Cycloheximide applied to leaves delayed and diminished the responses of NAE isoenzymes during senescence. The two novel NAEs were similar in MW and substrate affinity to pre-existing NAEs. Partially-purified NAE had no cholinesterase, carboxypeptidase, ethyl acetate esterase or ethyl butyrate esterase activity. Lack of inhibition by eserine, PCMB and organophosphorus insecticide classified these enzymes as acetylesterases.
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