Abscission as a Mobilization Phenomenon

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Abstract
The possibility that leaf abscission might involve a mobilization phenomenon leading to a localized cellular senescence was examined by following dry weight changes, chlorophyll content, and protein levels in proximal and distal tissue of excised pieces of bean petioles from Phaseolus vulgar is var. Red Kidney. Nucleic acid levels were determined, as were phosphate pool sizes in conjunction with p32 labeling patterns. Each of these parameters indicated a mobilization into the tissues proximal to the zone of cellular separation at the expense of the distal tissues, suggesting that mobilization is a component in the process of bean leaf abscission.