M.V. Zheltonozhskaya1, V.A. Zheltonozhsky2, A.N. Nikitin3, V.V. Rozanov4, A.P. Chernyaev5

1,2,4,5 Lomonosov Moscow State University (Moscow, Russian Federation)
 

The presented article reports the investigation in a model system of the influence of two types of ionizing radiation sources (a source of γ-radiation 121Sn and a source of mixed type radiation (β+γ) 137Сs) on the conidia germination and the germ hyphae length for micromycete strains isolated from areas with different levels of radioactive contamination, as well as for control strains. We have sampled micromycete strains from 10-km Chernobyl zone heavily contaminated soils containing hot particles and from the internal premises of the Chernobyl nuclear power plant destroyed 4th power unit. The control strains were isolated from the soils with a normal level of background radiation. It has been established that the positive radiotropism is inherent for Penicillium hirsutum 1 and Penicillium steckii 2 strains isolated from the hot particle surfaces. The species isolated from the internal premises of the Chernobyl nuclear power plant destroyed 4th power unit with various levels of radioactive contamination also had a radiotropic reaction. We observed the stimulation of the conidia germination under the action of at least one of two radiation sources for all studied strains possessing the radiotropism property. Differences were also revealed in the micromycete responses to the action of different radiation sources: under the 137Cs irradiation, the conidia germination was observed in 90% of the studied strains, while under the 121Sn irradiation, only in 50%.

Zheltonozhskaya M.V., Zheltonozhsky V.A., Nikitin A.N., Rozanov V.V., Chernyaev A.P. Study of the ionizing radiation impact on soil micromycetes. Science Intensive Technologies. 2022. V. 23. № 4. P. 63−69. DOI: https://doi.org/10.18127/j19998465-202204-08 (in Russian)

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