INCREASE IN THE ACTIVITY OF PHENYLALANINE AMMONIA-LYASE DURING THE NON-PHOTOPERIODIC INDUCTION OF FLOWERING IN SEEDLINGS OF MORNING GLORY (PHARBITIS-NIL)

The activity of phenylalanine ammonia-lyase in the seedlings of Pharbi tis nil strains 'Violet' and 'Kidachi' during the non-photoperiodic in duction of flowering increased in close association with the accumulat ion of phenylpropanoids and the induction of flower buds. This observa tion suggested that the increased activity of phenyalanine ammonia-lya se caused the accumulation of the phenylpropanoids and that the activa tion of the biosynthesis of phenylpropanoids might be involved in the non-photoperiodic induction of flowering in the seedlings of 'Violet' and 'Kidachi'.