The peculiarities of seed reproduction of the genus Rhamnus L. species
Aim. The article aimed at developing effective methods of seed propagation for the wider use of the genus Rhamnus L. species as valuable technical and medical plants, as well as their introduction into the greenery of Ukraine as ornamental plants. Methods. Seed reproduction of five genus Rhamnus L. species had been investigated using seed reproductive material (NDP “Sofiyivka” of NAS of Ukraine), as well as obtained from the “Trostianets” SDP of NAS of Ukraine and the KBG of NAS of Ukraine. The experiment covered the terms and techniques of pre-sowing preparation. Results. During the research, a fresh seeding of genus Rhamnus L. species was introduced. The appearance of seedlings was observed from 16.05 to 24.05. The seed germination energy was 7‒12%, and the soil similarity was 48‒60%. The collected mature seed of the studied species was mixed with wet sand and left to stratification at a temperature of +4 °C and relative humidity of 70‒80%. The appearance of seedlings was observed in 30‒38 days. The seed germination energy was 5‒11%, the soil germination was 34‒48%. Seeds of the studied species were treated with concentrated sulfuric acid with exposures of 5; 10; 15 and 20 minutes. Swelling of seeds and emergence of seedlings were observed at 9‒13 days after sowing. Positive results were obtained for processing seed of genus Rhamnus L. species sulfuric acid, where for 15-minute exposure, germination was 73‒96%. Conclusions. During the study of the influence of sowing, stratification and scarifying dates on the similarity of the genus Rhamnus seeds, in the conditions of the National Dendrology Park “Sofiyivka” of the National Academy of Sciences of Ukraine, it was found that freshly harvested seeds of genus Rhamnus L. species sprout without pre-planting preparation. After storage, the seeds require stratification. The seeds sown in the spring go back in the same year, but the germination process is stretched. Positive results were obtained in the 15-minute treatment of seeds of the genus Rhamnus H2SO4.
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