Abstract
We have examined the effect of exogenous gibberellin A3(GA3) on adventitious rooting of Prunus avium(cherry) cultivars Stella, F12/1 and Charger. We show that GA3pre-treatment of P. avium stock plants causes an increasein shoot growth rate and also improves the rooting of cuttings subsequentlytaken from the treated plants. Approximately 37% of cuttings from controlshootsrooted, whereas the percentage rooting could be increased to 80% or more withGA3 pre-treatment. The number of roots per rooted cutting was alsoincreased by GA3 pre-treatment. The stimulation of adventitiousrooting could be partially explained by the increase in shoot growth rate.Cultivar Charger responded better than the other cultivars to the lowest levelof GA3 treatment. In vitro cultures of cultivarCharger were also treated with GA3. However, the stimulation ofadventitious rooting was less marked than in the GA3-treated stockplants: percentage rooting increased from 70% to 85%. The results are discussedin the context of 'rejuvenation' effects of GA3.
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