[Investigation of daily mitotic activity of the birch, Betula pendula Roth].
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.
Vostrikova
T V
TV
Butorina
A K
AK
D029662:Betula / Q000166:cytology* / Q000502:physiology; D001683:Biological Clocks; D018519:Meristem / Q000166:cytology; D008938:Mitosis; D018517:Plant Roots / Q000166:cytology; D012621:Seasons; D036226:Seedlings / Q000166:cytology