The aim of this thesis was to determine the juvenility of three differently propagated plants and the juvenility duration. The ornamental cherry cultivar Prunus subhirtella 'Autumnalis' served as the starting material. Cuttings were taken from three different types of mother plants. The first mother plant was a physiologically old ornamental cherry (60 years old). The second group of mother plants were ornamental cherries grown from cuttings. The third group of mother plants were ornamental cherries grown in vitro. The trees in the second and third groups were 17 years old. The percentage of rooted and unrooted cuttings, percentage of rooted but failed cuttings, root length, number of roots, length of cuttings, number of cuttings, root development with callus, acrobasal rooting and basal rooting were estimated. The highest rooting rate was found in cuttings whose mother plants were propagated with cuttings, namely 95%. Most of the failed cuttings were from old trees, namely 21.7%. Cuttings from physiologically old trees had the most basal rooting. Cuttings whose mother plant was propagated with cuttings had the highest acrobasal rooting, namely 44.2%. Cuttings from physiologically old trees had the highest percentage of developed roots, 52.9%. Cuttings whose mother plant was propagated with cuttings had the highest number of shoots, the longest average cutting length and the highest number of main roots, namely 6, 99.5cm and 7, respectively. Cuttings whose parents were propagated in vitro developed the longest root cluster, namely 24.7cm.
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