title: [Peculiarities of mitosis and nucleolar characteristics of the birch plantlets under antropogenous pollution].
abstract: A study was made of some cytogenetic characteristics (mitotic activity, the level and spectrum of pathological mitosis, nucleolar features in root tip cells) in birch plantlets. The seeds were collected in four districts of Voronezh and in the ecologically clean territory. The index of mitotic activity has a considerable resistance to anthropogenous pollution. In the experimental areas, the level and spectrum of pathological mitosis increase. In contaminated areas we observed changes of nucleolar characteristics (the increased surface area of nucleoli and their higher number in cells, the increased number of cells with highly active types of nucleoli, the appearance of residual nucleoli). These changes can be considered as possible mechanisms of adaptation to stress due to antropogenous pollution. It is suggested that the use of such indices as single nucleolar surface area or the level of pathological mitosis may be perspective for cytogenetic monitoring of the environment, and for prognostification of environmental conditions suitable or unsuitable for the human health.
authors.affiliation: Voronezh State University.
authors.forename: A K
authors.initials: AK
authors.lastname: Butorina
authors.forename: V N
authors.initials: VN
authors.lastname: Kalaev
authors.forename: S S
authors.initials: SS
authors.lastname: Karpova
mesh_terms: D000222:Adaptation, Physiological; D029662:Betula / Q000166:cytology* / Q000648:ultrastructure; D002466:Cell Nucleolus / Q000648:ultrastructure; D003582:Cytogenetics; D004784:Environmental Monitoring / Q000379:methods; D004787:Environmental Pollution; D008938:Mitosis; D008940:Mitotic Index; D012426:Russia; D012639:Seeds / Q000166:cytology* / Q000648:ultrastructure