DOI: 10.11118/978-80-7701-049-8-0072

KLÍČIVOST SEMEN JEŘÁBU BŘEKU V ZÁVISLOSTI NA DOBĚ STUDENÉ STRATIFIKACE / GERMINATION OF WILD SERVICE TREE SEEDS DEPENDING ON THE TIME OF COLD STRATIFICATION

Kateřina Pešková¹, Martin Baláš¹, Ivan Kuneš¹, Miroslav Šulitka¹, Přemysl Šedivka², Tomáš Holeček², Vilém Podrázský¹

¹ Katedra pěstování lesů, Fakulta lesnická a dřevařská, Česká zemědělská univerzita v Praze, Kamýcká 129, 165 00 Praha-Suchdol, Česká republika

² Katedra zpracování dřeva a biomateriálů, Fakulta lesnická a dřevařská, Česká zemědělská univerzita v Praze, Kamýcká 129, 165 00 Praha-Suchdol, Česká republika

The germination capacity of the wild service tree seeds (Sorbus torminalis (L.) Crantz) was evaluated concerning the duration of cold stratification. Germination tests were conducted in 2020, 2021 and repeated in 2025. In the first two years, seed stratification began at the same time. The seeds were tested for germination immediately after two, three, and four months of stratification. Only fresh, non-germinated seeds were included in the germination tests. In the repeated experiment conducted in 2025, seed stratification was initiated gradually so that seeds subjected to two-, three-, and four-month stratification periods could be subjected to the germination test simultaneously. Within the experiment conducted in 2025, the fresh, dead, and prematurely germinated seeds were also recorded during the stratification period. Prematurely germinated seeds were also included in the germination tests but were documented separately. Based on the experiments, the minimum required duration for cold stratification can be determined as three months. However, with extended stratification, the percentage of seeds that begin germination too early, i.e. during stratification, increases.

Keywords: Sorbus torminalis, germination energy, germination capacity, moist chilling

pages: 72-78, Published: 2025, online: 2025