Archives2021V. 61. №2.pp. 180–188

Article

The Effect of Low-Dose γ-Radiation on Cytogenetic Endpoints of Onion (Allium cepa) Seedlings in Experiments of Various Durations

A. V. Zueva, E. A. Trofimova, D. V. Dementyev, and A. Ya. Bolsunovsky

Institute of Biophysic, Siberian Branch of the Russian Academy of Sciences, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, Russia

Abstract

The present study addresses response of onion (Allium cepa L.) seedlings to low-dose γ-radiation exposure (10 to 140 mGy) of various durations (24 and 48 h) based on growth and cytogenetic endpoints. The most sensitive endpoints to γ-radiation are the frequencies of occurrence of abnormal cells and micronuclei, which significantly differ from the control at the lowest doses of 20 and 70 mGy, respectively. The number of cells with micronuclei and chromosomal aberrations increases linearly with an increase in the absorbed dose, but the frequency of occurrence of micronuclei differs depending on the duration of exposure as well. The main factor for chromosomal aberrations to occur is exposure dose, while for the yield of micronuclei, the duration of exposure is also an important factor. Bioassay endpoints have been ranked by their response to low-dose γ-radiation.

Keywords

Allium test, onion seeds, seedlings, roots, γ-radiation, mitotic abnormalities, chromosome aberration, mitotic index, micronuclei, dose dependencies, low doses

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