Abstract
The failure of Early Amber peaches which had been field sprayed with Alar, Ethrel or gibberellic acid to darken as expected when cut is due to a 90 per cent reduction in the activity of polyphenoloxidase (EC 1.10.3.1) in the mature fruit. The possibilities that the reduced darkening might be due to the formation of a spray-induced reversible inhibitor or inactivator, to reduced substrate levels, or to elevated ascorbic acid levels were shown to be untrue.
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