Strategies of adaptation under prolonged irradiation vs chronic exposure

Abstract

Effect of prolongedand chronic exposure has a lot to do but ultimately radically different. Aim-analysis of the adaptation processes induced by prolonged and chronic exposure and identification their direction and consequences. Objects-plant: pea and plantain seeds; animal: small rodents; human populations living in the contaminated territories. Methods-cytogenetic studies and statistical modeling. Results-cytogenetic studies have shown an increased frequency of genetic abnormalities and paired with the survival decline. Statistical modeling revealed genomic instability induced by prolonged and chronic exposure. It was shown that prolonged impact causes a sharp increase in variability accompanied with decrease in survival, but enhanced fertility in plants and animals, which can synergistically be enhanced by other abiotic stress. It has been shown in humans by the statistical modeling that chronic exposure leads to the formation a subpopulation which is resistant to radiation and other influences. Resume-a population under prolonged irradiation aims to improve its diversity: it is involved different pathways that contribute into genetic instability, variability and fertility; strategy under chronic exposure aims resistance to radiation and other stress factors that needs instability coupled with different selection pathways that produces a subpopulation resistant in generations.