Abstract
Levels of exo- and endopeptidase activity in shoot bark of apple ( Malus domestica Borkh.) increased during the winter. Seasonal changes in bark protease activities paralleled the variation in the rate of reserve protein mobilization induced by transfer to a 25 °C growth chamber. In excised internodal sections protease levels increased during incubation at 20 °C; 2- cis -4- trans -abscisic acid (ABA) inhibited these increases. Suppression of protease synthesis or activation by ABA is proposed as the primary regulation of the accumulation and mobilization of shoot bark reserve protein.
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