Abstract
D-Phenylalanine, contrary to its L-stereoisomer causes an increase in L-phenylalanine ammonia-lyase (PAL) activity during the culture of dormant and stratified apple embryos and during the germination of mustard, rape and oat seeds. None of the other six pairs of L- and D-aminoacids tested caused a comparable effect. It was demonstrated that the increase of PAL activity follows the normal germination and that the stimulation of this activity by D-phenylalanine is not directly related either to germination or to the growth processes. The possible mechanism of PAL stimulation in vivo is discussed.
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