Iavniuk A. Peculiarities of early ontogenesis of the common reed Phragmites australis (Cav.) Trin. ex Steud. in conditions of water bodies radionuclide contamination

The thesis is devoted to the complex study of development disorders of seed progeny of the common reed Phragmites australis (Cav.) Trin. ex Steud. under the impact of long-term low-intensity ionizing irradiation and different duration of rest period. The inverse dependence between vitality of the common reed seed progeny and long-term irradiation absorbed dose rate, was found. The increase of the common reed seed rest period duration from 30 to 160 days was accompanied by the regeneration of Chernobyl Exclusion Zone plant seed progeny vitality. The most widespread abnormalities of vital reed seedlings were organogenesis and geotropism disorders, number of which in proportion to the total number of abnormal seedlings was an order of magnitude larger in comparison with the reference samples. It has been established that survivability, growth indices and total number of abnormalities of seedlings reliably indicate the impact of the radiation factor and can be recommended for the evaluation of the reed damage in conditions of long-term ionizing radiation exposure in radionuclide contaminated reservoirs.