Aim. The aim is to study the ontogeny and structure of introduced populations of useful plants in Central Yakutia. Methods. Description of the ontogeny of the plants under study was carried out with the determination of ontogenetic states according to generally accepted methods. After planting, current measures were taken to care for plants with elimination of weeds and preservation of the undergrowth. The number of plants at the planting sites was calculated annually. Results. In plants, there is a polyvariety of the rate of development, in which the life cycle is shortened in individuals, the rate of development is accelerated or the ontogenetic states are missed, and there is also transition of plants to a temporarily non-flowering state. All studied introductory populations were left-sided and had different absolute maxima, which depended on the life form and duration of plant stay in culture. Conclusions. Among young monocentric plants we saw the development and attenuation of the population (Delphinium grandiflorum, Linum komarovii, Plantago major, Redowskia sophiifolia). In them, absolute maximums fall on juvenile, immitric, virginile and young generative groups. In populations of monocentric perennial plants, Lilium pensylvanicum and Adonis sibirica, absolute maxima fall on virginile groups. For studied years, the nature of the developmental spectrum in populations of Clausia aprica and Tussilago farfara has not changed with the absolute maximum in the virginal group.

Аim. In this paper, we set out to study the life cycle of Thlaspi arvense L. in Central Yakutia.Methods. The studies were carried out in a culture at the nursery for the collection of medicinal plants of the Yakut Botanical Garden (Institute for Biological Problems of Cryolithozone SB RAS).Results. While the plant in question has a high rate of aerial part development, its underground part falls behind in terms of mass development as compared to its aerial part. The pre‐generative period lasts for 13‐17 days. Small white flowers of the plant form a corymbosepaniculate inflorescence (1.0–4.5 cm in height; 52–67 flowers per inflorescence). The plant reaches 18.0–29.0 cm in height and has 19–24 leaves. The generative state lasts for 49–55 days.Conclusions. Freshly harvested seeds of T. arvense are in non‐deep physiological dormancy; their laboratory germination rate amounted to 2%. Following 6 months of dry storage, 100% germination of seeds was noted. However, the course of germination changed dramatically becoming explosive in nature. The life cycle of T. arvense lasts for one growing season (70–76 days). Three periods and five developmental states in the ontogeny of T. arvense have been identified.

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The features of accumulation of rutin and apigenin-7-O-glucoside and their distribution in the aboveground organs of Alyssum lenense Adams (Brassicaceae Burnett) were revealed. The content of photosynthetic pigments was investigated depending on the phytocenotic conditions of plant growth in the territory of Central Yakutia. The data obtained on the content of flavonoids are characterized by an uneven distribution over organs with respect to different phytocenotic conditions of the growth of cenopopulations. A. lenense was collected during flowering period in 8 cenopopulations and in the collection of the Yakutsk Botanical Garden. The distribution of rutin content over the aboveground organs of A. lenense was directed: flowers → leaves → stem and depended on the altitude of the population growth, shading, and phytocenosis. The distribution pattern of apigenin-7-O-glucoside corresponded to the scheme: flowers / = leaves → stem and depended on phytocenotic growing conditions. It was revealed that rutin in flowers is higher than apigenin-7-O-glucoside under the conditions of introduction and in the Veronica incana-Festuca lenensis-Stipa capillata grass steppe; in the plants of the other studied cenopopulations, the ratio was inverse. The same amount of flavonoids in flowers was observed in A. lenense, growing in Pulsatilla flavescens steppe and Artemisia commutata steppe. In most of the studied cenopopulations, the content of apigenin-7-O-glucoside in leaves and stems was higher than rutin, with the exception of populations growing in a dry pine forest, at the edge of a pine forest, and in leaves - only in plants on an artificial slope at the initial stage overgrowth. Phytocenotic growing conditions affect the amount of pigments in the leaves of A. lenense: the largest amount was recorded in the population growing in a dry pine forest, and the smallest in Artemisia frigida steppe and Artemisia commutata steppe.