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The paper shows composition and content of phenolic compounds in leaves of 4 Nitraria L. species from 58 populations of Russia, Kazakhstan, and Tajikistan studied with high-performance liquid chromatography(HPLC). The investigation has revealed 27 compounds of phenolic nature: the maximum number (18 components) is detected in leaves of N. sibirica Pall. from Kazakhstan (the Karatal river valley), 16-17 components – in plants from three populations of Siberia, the minimum (6 components) – in leaves of N. komaroviiilljin & Lava ex Bobrov. The analysis has identified hyperoside (quercetin O-glycoside), narcissin (isoramnetin O-glycoside), quercetin (flavonol) and luteolin (flavon). The studied plants accumulate a generous quantity of phenolic compounds. Their content reaches 4.64% in leaves of N. sibirica, 3.11% – in N. schoberi L., up to 3.96% – in N. komarovii. The research results allow speaking about the species-specific composition and content of phenolic compounds of N. sibirica, N. schoberi and N. komarovii. The component composition is weaker in extracts of N. komarovii leaves, but there is a higher content of total phenolic compounds compared to N. schoberi plants. N. pamirica L. Vassil sample is close to N. schoberi on multidimensional analysis of the phenolic compound composition and content.

The article presents a scientometric analysis of documentary arrays selected of the world science citation databases Scopus and Web of Science on the topic “Plant flow cytometry”. The analysis of documentary arrays shows their positive dynamics and especially active growth currently. It names countries and organizations actively carrying on research in the area, and leading in the publication amount; rating journals with high publication activity, authors who work productively on the topic. The paper reveals thematic structure of the studied corpus of documents and highly cited publications.

The article considers research of the phenolic compounds composition and content in leaves of Bistorta alopecuroides (Turcz. Ex Meissn.) Kom. from different populations using HPLC methods. It shows that B. alopecuroides component composition is quite variable and depends on many environmental factors, such as microclimate, altitude, technogenic pollution. Isovitixin, rutin and flavonolglycoside (tR = 9.2 min; UV 273, 355 nm) compounds are found in B. alopecuroides leaves of all studied populations. B. alopecuroides growing in high mountains and under technogenic pollution conditions have the highest content of phenolic compounds, which confirms their adaptive role in plant metabolism. The total content of phenolic compounds in leaves of B. alopecuroides plants reaches 20.82mg/g.

For the first time are search of nuclear DNA relative content in Nitraria schoberi L. seeds from 15 natural populations of Siberia, the Crimea, Kazakhstan, and Tajikistan has been conducted by the method of flow cytometry. High intra-and interpopulational variations of nuclear DNA content - 2,93-3,39 pg, at average value - 3,22±0,108 pg is revealed.