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Библиогр.: 36 назв.

The set and levels of phenolic compounds in water-ethanol extracts from the leaves of Spiraea betulifolia subsp. aemiliana (Schneid.) Hara (Rosaceae) were studied under natural conditions and after introduction into the Novosibirsk (Russia) environment. The samples were collected in two natural coenopopulations (Kunashir Island) and in the Introduction Division of CSBG SB RAS (Novosibirsk) in 2016–2019. Flavonoids and phenolcarboxylic acids were found in the extracts. Using high-performance liquid chromatography, we detected 19 phenolic compounds in the water-ethanol extracts from plant leaves of the natural populations and 26 in the introduced population. Thus, differences in high-performance liquid-chromatography profiles of phenolic compounds were found between the natural populations and the introduced population. Five new phenolic acids and one flavonol were discovered in the leaves of the introduced plant population. Additionally, the levels of some phenolic compounds in the leaves of S. betulifolia subsp. aemiliana changed as a result of the transfer from the wild to the new environment. Hyperoside (3.36–9.99 mg/g) is the major phenolic compound in the leaves of the natural populations, while quercetin (1.23–5.07 mg/g) is the major phenolic compound in the leaves of the introduced population. The differences in the leaf concentrations of quercetin and hyperoside between the natural and introduced populations were statistically significant (P ≥ 0.05). Concentrations of taxifolin, isoquercitrin, rutin, avicularin, astragalin, kaempferol, and chlorogenic, p-coumaric, and cinnamic acids in the leaf extracts were found to be similar between the introduced and natural (Kunashir Island, Lake Kipyashcheye shore) populations. Across plant development phases, inhomogeneous distributions of individual phenolic compounds were revealed in the leaf extracts from the introduced S. betulifolia subsp. aemiliana.