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Additional index words. auxin, indole-3-acetic acid, indole-3-butyric acid, propagation, rooting, rootstock Abstract. The infl uence of two exogenously applied auxins (IAA and IBA) on the root and shoot development of leafy cuttings was analyzed at 'GiSelA 5', the dwarfi ng cherry rootstock. IBA (indole-3-butyric acid) hindered the callus formation in the early period of root development and it was more successful than IAA (indole-3-acetic acid) in promoting earlier root development. IBA also infl uenced the stronger shoot growth and the develop- ment of acrobasal type of the rooting system, and induced higher number of roots. Those parameters are very important for the quality and survival of the new plants and they are not the consequence of the higher IAA content in the rooting zones of cuttings in the fi rst days of root development. Both auxin treatments had no effect on the fi nal percent of the rooted cuttings neither on the survival of cuttings, but they increased the percent of rooted cuttings without callus. The root system with callus proved less qualitative, because the cuttings with such root system developed signifi cantly less roots per rooted cutting and their shoot length was shorter than those of the cuttings without callus at both auxin treatments. Exogenously applied auxins were not crucial for root formation, however their application resulted in higher percent of more qualitative 'GiSelA 5' leafy cuttings. IBA proved as the most effi cient treatment and it additionally induced earlier root formation. Propagation of the diffi cult-to-root plant species becomes commercially feasible with the establishment of the optimal propagation method. A key step in vegetative propagation is adventitious root formation. Losses occur because of the poor quality of the root system or of the shoot and because of poor or slow

Influence of IAA and IBA on root development and quality of Prunus 'GiSelA 5' leafy cuttings