THE PLANT SEXUAL POLYMORPHISM IN THE SUBCLASS MAGNOLIIDAE AND RANUNCULIDAE IN SIBERIA.
THE SURVEY OF LITERATURE ON THE SUBJECT

Godin Vladimir Nikolaevich, Doctor of biological sciences, professor, sub-department of botany, Moscow State Pedagogical University (Moscow, 6 Kibalchicha str.), godinvn@yandex.ru

57.017.5: 581.9

Background. The identification of species with sexual differentiation within floristic regions can contribute to solving a number of important plant sex issues, including the identification of the evolutionary causes of sexual differentiation. The aim of this paper is the identification of species with sexual differentiation and analysis of the relationship of sexual differentiation to the biological features of species as exemplified in the subclasses Magnoliidae and Ranunculidae in Siberia.
Materials and methods. For each species and subspecies the following characteristics are given: sexual differentiation, life form, vegetative mobility, area type, zonal group, ecological group in relation to humidification.
Results. In 4,1 % (11 species) of metasperms of the subclass Ranunculidae in Siberia four forms of sexual differentiation have been found: gynomonoecy, andromonoecy, gynodioecy, dioecy, the most frequent ones being gynodioecy (5 species) and anromonoecy (3 species). In the subclass Magnoliidae one sexual form, monoecy, has been found in 33,3 % (3 species). There is a direct connection between the intensity and direction of sexual differentiation of plants and their life forms, vegetative mobility, ecological, chorologic and phytocenotic features.
Conclusions. In the subclass Ranunculidae there is the weakest differentiation into sexual types and forms of all dicotyledonous plant subclasses: out of 271 species only 11 have unisexual flowers. In the evolutionary process ecological and phytocenotic conditions determined the intensity degree of transition from hermaphroditic plants to the non-hermaphroditic state.

sexual differentiation, Magnoliidae, Ranunculidae, Siberia.

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