Biological effects of α-radiation exposure by 241Am in Arabidopsis thaliana seedlings are determined both by dose rate and 241Am distribution

摘要: Human activity has led to an increasing amount of radionuclides in the environment and subsequently increased risk exposure biosphere ionising radiation. Due their high linear energy transfer, α-emitters form a threat biota when absorbed or integrated living tissue. Among these, 241Am is major concern due affinity for organic matter specific activity. This study examines dose-dependent biological effects α-radiation delivered by at morphological, physiological molecular level 14-day old seedlings Arabidopsis thaliana after hydroponic 4 7 days. Our results show that transfer roots but low translocation shoots. In roots, we observed transcriptional response reactive oxygen species scavenging DNA repair pathways. At morphological this resulted which evolved from redox balance control stable biomass dose rates growth reduction, reduced decline higher rates. situation was also reflected shoots where, despite absence response, photosynthesis performance declined with rate. The data further suggest both organs were initiated where highest occurred, ultimately affecting carbon assimilation. Though detailed nutrient localisation necessary, it clear radionuclide uptake distribution parameter global on plant health.