Laboratory germination and storage of seeds of tree and shrub introduced species

The article presents the results of research on laboratory germination of seeds of tree and shrub introduced species. Introduced seeds were collected from existing plantings in Irkutsk and the Irkutsk region. To speed up germination and increase the percentage of germination, seed stratification was performed. Seeds of Spiraea media, Betula pendula, Picea obovata, Picea pungens, Pinus sylvestris, as a rule, do not require stratification, or for violation of shallow rest, the seeds need short-term cooling (for several hours, days or weeks). Cold stratification is required for seed germination of Betula ermanii, Clematis fusca, Corylus avellana, Juglans mandshurica, Phellodendron amurense, Syringa vulgaris . Multistage stratification is recommended for Schisandra chinensis seeds. Within a few days, the seeds of Populus alba and Scopulus balsamifera lose their ability to germinate. Quercus mongolica seeds completely lose their germination by spring sowing when stored dry. Seeds of Corylus avellana, Juglans mandshurica, Phellodendron amurense, Schisandra chinensis can be stored for only one year. The shelf life of Betula ermanii and Betula pendula seeds is 3-4 years. Picea obovata, Picea pungens, Pinus sylvestris retain germination for 4-5 years. Studies have shown that the shelf life of Spiraea media, Syringa vulgaris, Clematis fusca seeds for 4-5 years did not affect the percentage of their germination.