Abstract
SummaryApplications of Alar to young sweet cherry trees for two successive seasons promoted flower bud formation. The starch content of the treated branches was higher than that of the control shoots, but the lignin contents were equal except in the terminal part. Stem diameter was increased by the treatment, but neither the average transverse diameter of the xylem cells nor their wall thickness was measurably changed. While causing a reduction in diffusible GA from apices of upright shoots, Alar did not affect the amount which diffused from horizontal or laterally oriented shoot apices. The amounts of diffusible and extractable gibberellin-like substances from the apices of upright shoots decreased with time; Alar treatment accentuated the decrease.
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