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

When cut stems of three species of Salix were transferred tolong day conditions conducive to growth, the number of budswhich 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 startof the experiment resulted in a diminution of the number ofbuds which commenced growth while there was a substantial increaseas spring approached. Abscisic acid (ABA) at 10^–4 M was also capable of depressingbud burst in certain circumstances although this effect diminishedas spring approached. The effect of ABA was also significantlygreater in at least two of the three species if the leaves wereremoved from the stems at the time of transfer to long day conditions. Interactions were also observed between species and harvestdates, bud position and species and bud position and harvestdate. Salix spp, willow, bud burst, abscisic acid