This diploma thesis was elaborated on the theme "The study of factors influencing service tree (Sorbus domestica L.) micropropagation". The experiments were carried out in in vitro laboratory of the Mendeleum - Institute of Genetics and Plant Breeding of the Faculty of Horticulture in Lednice. The aim of this work was to acquire and improve the knowledge of in vitro cultivation of serviceberry and the genus Sorbus L. in general. The trees growing in experimental land of the Faculty of Horticulture MZLU in Lednice were selected as experimental material. The composition of cultivation medium was verified for plant growth and multiplication purposes. The influence of two different cytokinins BA (benzyl-adenine) and zeatin was evaluated. The shoot number and shoot length were measured. The highest multiplication rate evaluated by the origin of new formed shoots was accomplished on media supplemented with BA (0.1 mg.l-1). Nevertheless the shortest height of shoots was measured on this media. It was valid for both cytokinins that number of shoots was increasing with increasing cytokinin concentration whilst the shoot height was decreasing.