Croissance du bourgeon axillaire chez Salix babylonica L. et activit Phenylalanine ammoniac lyase

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Abstract
In continuous red light (660 nm) apical dominance is lost after decapitation of the cutting. The highest leaf bud starts growing and replaces the cut-out apical bud. The PAL activity at that level first increases, then becomes stable. In continuous blue light (440 nm), apical dominance is maintained in spite of decapitation. The growth of the axillary bud is negligible and the PAL activity at that same level rapidly tends to zero.