INFLUENCE OF OVERCOMING DORMANCY METHODS ON MAGNOLIA X SOULANGEANA SOUL. BOD. SEEDS GERMINATION

The goal of the experiments carried out was to analyse the influence of different types of preseeding treatment on the germination and dormancy breaking of Magnolia x soulangeana seeds. Seven types of preseeding treatment were used to break seed dormancy - warm-cold stratification, cold stratification, chemical scarification, pouring with boiling water and any combination of these treatments. The lowest germination was noted after the application of pouring with boiling water. The best results were obtained after chemical scarification in hydrochlorid acid (HCl) in combination with a four month period of cold stratification. After the combination of these mentioned methods it was possible to break the exogenous and endogenous dormancy of the Magnolia x soulangeana seeds