[Cytomixis, its nature, significance and the cytological consequences].

Cytomixis is the widespread natural process of intercellular interaction which is characteristic for vegetative and generative tissues in both normal and pathological conditions. The origin significance and genetic control cytomixis still remain not completely clear. The popularity of view of the pathological nature of cytomixis based on its peculiar plants with genetic instability and impaired homeostasis. In the genetic control of cytomixis seem to be involved meiotic genes which are responsible for segregation and organization of chromosomes. Their activity is modified by environmental factors through signal transduction. It is assumed via cytomixis, from one side, the informational contact can be reached and meiosis and gametogenesis are synchronized, with another, increase of the genetic variety and level of the heterozygosis of microsporocytes. The activity of cytomixis varies over wide limits. The greatest influence on its activity have mutagenesis hybridization and polyploidy. In this context cytomixis can fulfill the function of cell selection which is activated by exceeding of the threshold level of the microsporocyte damages (or genetical disbalance).