Stem and fruit tissues of ‘Valencia’ and navel oranges were treated with ethylene via the decomposition of applied (2-chloroethyl)phosphonic acid (ethephon). Ethephon applications were sufficient to cause uniform loosening of the fruit from the tree. The tissues then were extracted and the extracts assayed by a citrus albedo tissue maceration test for enzyme activity. Maceration activity increased with time after ethylene treatment.
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Rogers et al. (1971) studied this question.
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