[Cellular and tissue mechanisms of restoration processes in Hordeum distichum L. after irradiation].
The ionizing and UV-B irradiation of barley seedlings results in an increase of a number of chromosome aberrations in vegetative and generative meristems as well as pathology in the microsporo- and microgametogenesis. Dynamics of chromosome aberration formatting in root meristem has the invert correlation to the dose of irradiation. Induced damages in the range of not significant doses of irradiation were discovered during the whole ontogenesis of the plants. The increase of irradiation dose has activated the cytolysis processes during pre-meiotic interphase and early meiosis that caused the decrease of pollen grain pathology count. Fertility of pollen grains restored under the maximum exposition of ultraviolet and moderate doses of gamma irradiation. This may be result of cell competition. Cell competition under irradiation limits mutagenesis, regulates the condition and quantity of cell population, causes reparation of fertility and maintains homeostasis.