Abstract
Changes in RuDPC and PEPC activities were investigated in non-dormant apple embryos grown in water as well as in solutions of abscisic acid (ABA) at various concentrations. At all concentrations applied ABA caused a decrease in ribulose-1.5-diphosphate carboxylase (RuDPC) activity and an increase in phosphoenolpyruvate carboxylase (PEPC) activity. These effects were correlated with a decrease in germinability as well as with a decrease in growth rate and a decline in chlorophyll content. The results reported suggest that endogenous ABA in dormant embryos regulates the carboxylating enzyme activities and chlorophyll content.
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