[Sex structure and seed productivity of Mentha canadensis L. from natural flora of primorye of Russia].

The sex structure and seed productivity of Mentha canadensis L. from different climatic regioins of Primorye of Russia was studied. We established that M. canadensis is characterized by a homogeneous population structure due to the formation of vegetative clones. The ratio of female and androgynous individuals was 1:5, and it is possible that this is a species-specific trait. Both sexual forms produced fruits under conditions of isolation from cross-pollination. We discuss the possibility of apomixis and the influence of climatic conditions on seed productivity and morphometric characteristics of plants.

[Phenotypic and phytochemical differences between Mentha arvensis L. and Mentha canadiensis L].

A taxonomic study of anatomical, morphological, and phytochemical characteristics of Mentha arvensis L. and Mentha canadiensis L. using hierarchical cluster analysis has been conducted and the differences between the species studied have been revealed. The ratio between the lengths of the calyx tube and the calyx lobes, the number of secretory glands on the upper and lower surfaces of the leaf, and the composition of the essen- tial oil were shown to be the most appropriate parameters for classification.

[Correlation between the output and composition of essential oil and the level of salicylic acid in mint plants at different ontogenetic stages].

Dynamic changes in the content of acetylsalicylic acid and the output and qualitative composition of essential oil have been studied in mint plants (Mentha spicata L. and cultivar Medichka) during their ontogenesis with allowance for changes in weather conditions. Ontogenetic changes in the level of acetylsalicylic acid in leaf tissues are found to be similar in both cv. Medichka and M. spicata. In the case of cv. Medichka, this change is connected with the dynamics of the production and the qualitative composition of essential oil; in the case of M. spicata, this connection is less expressed. The role of acetylsalicylic acid and essential oil in plant adaptation to the environment is discussed.

[Physiological and biochemical aspects of clary (Salvia sclarea L) overwintering in central Russia].

Changes in the hormonal balance and the contents of carbohydrates, nitrogen, phosphorus, and potassium in overwintering organs of the biennial herb clary (Salvia sclarea L.) have been studied in relation to the adverse influence of environmental factors. Weather-related changes in tissue contents of cytokinins (CTK), abscisic acid (ABA), water-soluble sugars, and mineral nutrients elements have been detected in these organs. Each overwintering organ (rosette leaves, the basal part of the stem with axillary growth buds, and the storage portion of the root) is characterized by specific dynamics of the compounds tested. The role of phytohormones and carbohydrates in realization of plant adaptation potential is discussed.

[Phytohormones of rhizomes of the mint of various geographic origin in its annual developmental cycle]. / Fitogormony kornevishch miaty razlichnogo geograficheskogo proiskhozhdeniia v godichnom tsikle ee razvitiia.

We studied the ratio of cytokinins and abscisic acid in the rhizome tissues of two southern introduced forms of mint (GBS 1-94 and GBS 2-94) in the annual cycle of its development under the climatic conditions of the Middle Zone of Russia. The level of cytokinins exceeded that of free abscisic acid during the entire period of rhizome growth and development. Three peaks of an excess--zeatin riboside over abscisic acid were established: (a) during mass flowering, (b) after dying off terrestrial shoots, and (c) before the appearance of shoots of the next year vegetation. These peaks were most distinct in the GBS 2-94 mint. Zeatin riboside was the major identified cytokinin. The role of balance of phytohormones in rhizome tissues upon adaptation of the introduced mint forms to new climatic conditions is discussed.