Intraspecific variability of floral and ornamental plants of Onagraceae family and mechanisms of their variety formation

The present review is devoted to intraspecific variability of floral and ornamental plants of the genus Clarkia purch. Family Onagraceae and clarification of the systematic status of the Godetia species introduced into Novosibirsk. Clarkia species from the Godetia and Rhodantos sections are noted for their particular beauty and duration of flowering. A comprehensive study of the influence of environmental conditions on genetic features of populations, ornamental qualities, flowering biology, morphogenesis, organogenesis, seed production and seed quality, agrotechnology’s of growing the above species of Clarkia, for selecting suitable forms and creating local varieties included in the basic assortment of flower crops for climatic conditions of Western Siberia as well as their introduction into urban gardening is necessary. The article discusses taxonomic markers important for determining the systematic position of Clarkia species from Godetia and Rhodantos sections in the family Onagraceae. Experimental data of genetic and cytological analyses carried out by foreign scientists for the last 100 years are presented, which give an idea of morphological, karyological characteristics and genetic variability in various species in the Godetia section. The mechanisms of inheritance of the flower colour trait and numerous variations in the position of the spot on the petals of different clarkia species have been established. Formation of the list of genes responsible for the Clarkia pigmentation system, location and size of the carmine spot will allow targeted selection for qualitative traits. The study of the pattern of multifactorial inheritance of habitus and flower shape traits among C. amoena subspecies contributes to the passage of the most decorative hybrid forms (varieties) as the starting material. In conclusion, a brief overview of promising species of the genus Clarkia from the Godetia and Rhodantos sections for ornamental plant breeding and selection is given.

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