N.N. Likhenko, A.P. Boronina
Siberian Institute of Plant Growing and Selection
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Summary. The studies are conducted on the collection kept and studied in the arboretum of the Siberian Institute of plant cultivation and breeding, located in the forest of Novosibirsk region. To reveal the peculiarities of species adaptation to growth and development under new conditions of existence the assessment of the reproductive abilities using the scale of Maleeva VP (1933) with additions was carried on. An adaptive capacity was estimated at 38 species, of which 2 - Fraxinus oregona Nutt. and Robinia pseudoacacia L. were referred to the group of plants that do not bloom when they are mature (0 points). To the group of slightly blooming, but not giving seeds or forming non-germinating seeds (1 point), are referred Populus David L., Acer mandshuricum Мах. and other. Seed reproductivity of Shepherdia argentea Nutt., Amygdalus nana L. and other is estimated as 2 points. These plants do not bloom or blossom very moderately. They produce little seeds, or the seeds have low germinating capacity. The plants have predominantly vegetative propagation. The plants whose seed fertility is estimated at 3 points, fully go through their life cycle, but are not able to support the self-reproductive population under rainfed conditions (Pyrus ussuriensis Maxim., Padus ssiori Schneid and others). The group that abundantly gives fruit and is regularly self-sowing for the areas without irrigation (4 points) is represented by the species such as Quercus robur L, Acer platanoides L. and other. The group of species, whose seed fertility are estimated at 5 points, is represents by the species such as Padus grayana Maxim, Crataegus almaatensis Pojark, Rosa rugosa Thunb. and other. The highest rate (6 points) have Acer negundo L., Padus pensylvanica (L. f.) Sok, Hippophaе rhamnoides L, Elaeagnus argentea) Pursh. High reproductive potential of some introduced species of plants, allowing the formation of fully functional seeds in the new environment, is also one of the main preconditions for independent existence, and settling of plants, that have not previously grown in the area.
Keywords: seed fertility, self-sowing, vegetative propagation, arboretum, the settling of plants, reproductive potential.