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 Pharbitis nil strains ‘Violet’ and ‘Kidachi’ during the non-photoperiodic induction of flowering increased in close association with the accumulation of phenylpropanoids and the induction of flower buds. This observation suggested that the increased activity of phenyalanine ammonia-lyase caused the accumulation of the phenylpropanoids and that the activation of the biosynthesis of phenylpropanoids might be involved in the non-photoperiodic induction of flowering in the seedlings of ‘Violet’ and ‘Kidachi’.