INVESTIGATION OF DAILY MITOTIC ACTIVITY OF THE BIRCH, BETULA PENDULA
ROTH
T. V. Vostrikova, A. K. Butorina
Chair of Genetics, Breeding and Evolution Theory, Voronezh State University, Voronezh, Russia;
e-mail: bsgenl85@main.vsu.ru
A study was made of the daily mitotic activity in the seedling root meristem of birch trees growing in an ecologically clear
area - the biological station of Voronezh State University "Venevitinovo". The peak of mitotic activity was exposed at 9 a. m.
(according to winter time). The rise of mitotic index was noted at 9 and 12 p. m. due to an increase in the share of cells being in the
prophase stage, and to a high number of dividing cells with persistent nucleoli. A possibility of prolongation of the mitotic cycle time is
supposed to be due to cell delay in prophase stage, which may be associated with anthropogenic and nature-climatic influences on
the original trees themselves and on their seed progeny. This makes it possible to consider the investigated region as only
conventionally clear, because of the availability of a high recreative pressure upon the trees.
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