Features of renewal bud development in some species of the genus Geranium L.

The genus Geranium L. of the family Geraniaceae Juss. includes more than 450 species, distributed in temperate climate zones and mountainous tropical zones. Currently, there are about 850 varieties of geraniums of foreign origin, including interspecific hybrids. Perennial hardy geraniums ( Geranium L.) are widely used as ornamental, medicinal and melliferous plants, as well as raw materials for the production of essential oils. A comprehensive study of their economic and biological traits and properties is a promising task for the successful use of geraniums in various fields. The article presents the results of the study of the features of the morphogenesis of the generative organs in some species of Geranium L. before the beginning of the spring regrowth on sod-podzolic soils in the conditions of the Central Non-Black Earth region. The objects of the study were Geranium sylvaticum L., Geranium phaeum L., Geranium macrorrhizum L. and Geranium x oxonianum Yeo ‘Wargrave Pink’ from the field collection of ornamental geraniums of the Vegetable Experimental Station named after V.I. Edelshtein, Russian State Agrarian University – Moscow Timiryazev Agricultural Academy. A direct relationship was established between the degree of development of vegetative-generative buds during the period of spring regrowth, their morphological parameters and flowering dates. The structural features of renewal shoots and rhizomes of geraniums are described. Morphological data characterizing the state of vegetative-generative buds in spring provide an opportunity to predict further seasonal rhythms of plant growth and development.