The Effects of Exogenously Applied Abscisic Acid on Bud Burst in Salix spp

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Abstract
When cut stems of three species of Salix were transferred to long day conditions conducive to growth, the number of buds which grew within a 4 week period was dependent on various factors, including the species and the position of the buds on the stem. In addition, the removal of leaves from the stems at the start of the experiment resulted in a diminution of the number of buds which commenced growth while there was a substantial increase as spring approached. Abscisic acid (ABA) at 10−4 M was also capable of depressing bud burst in certain circumstances although this effect diminished as spring approached. The effect of ABA was also significantly greater in at least two of the three species if the leaves were removed from the stems at the time of transfer to long day conditions. Interactions were also observed between species and harvest dates, bud position and species and bud position and harvest date.