MICROPROPAGATION OF AN OLD SPECIMEN OF COMMON LILAC (Syringa vulgaris L.) FROM THE DENDROLOGICAL GARDEN AT PRZELEWICE

Abstract. The published results on plant propagation m vitro culture show the importance of maternal plant age in a successful regeneration process. It is known that initiation ef-fectiveness is low when primary explants are taken from old trees. The aim of this study was an attempt to regenerate Syringa vulgaris from an old specimen of Dendrological Garden in in vitro culture. April turned out to be the optimal month for collecting ex-plants. The highest percentage of initiated shoots were obtained on MS medium contain-ing 7.5 mg⋅dm-3 BAP and 0.02 mg⋅dm-3 NAA. The highest propagation efficiency was re-ceived on MS medium with a double amount of MgS04 supplemented with 1.0 mg⋅dm-3 BAP. Insignificant effects were observed on the media with cytokinin BAP. The plants with the best-developed root system were obtained on MS medium with reduced to amount of macro- and micronutrients supplemented with 5.0 mg·dm-3 IBA. Key words: rejuvenation, micropropagation, common lilac, growth regulator