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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19193

Title: Biological effects of α-radiation by 241 Am in Arabidopsis thaliana seedlings are determined both by dose rate and 241 Am distribution
Authors: Biermans, Geert
Horemans, Nele
Vanhoudt, Nathalie
Vandenhove, Hildegarde
Saenen, Eline
van Hees, May
Wannijn, Jean
Vangronsveld, Jaco
Cuypers, Ann
Issue Date: 2015
Abstract: Human activity has led to an increasing amount of radionuclides in the environment and subsequently to an increased risk of exposure of the biosphere to ionising radiation. Due to their high linear energy transfer, a-emitters form a threat to biota when absorbed or integrated in living tissue. Among these, 241Am is of major concern due to high affinity for organic matter and high specific activity. This study examines the dose-dependent biological effects of a-radiation delivered by 241Am at the morphological, physiological and molecular level in 14-day old seedlings of Arabidopsis thaliana after hydroponic exposure for 4 or 7 days. Our results show that 241Am has high transfer to the roots but low translocation to the shoots. In the roots, we observed a transcriptional response of reactive oxygen species scavenging and DNA repair pathways. At the physiological and morphological level this resulted in a response which evolved from redox balance control and stable biomass at low dose rates to growth reduction, reduced transfer and redox balance decline at higher dose rates. This situation was also reflected in the shoots where, despite the absence of a transcriptional response, the control of photosynthesis performance and redox balance declined with increasing dose rate. The data further suggest that the effects in both organs were initiated in the roots, where the highest dose rates occurred, ultimately affecting photosynthesis performance and carbon assimilation. Though further detailed study of nutrient balance and 241Am localisation is necessary, it is clear that radionuclide uptake and distribution is a major parameter in the global exposure effects on plant performance and health.
URI: http://hdl.handle.net/1942/19193
DOI: 10.1016/j.jenvrad.2015.07.007
ISI #: 000362137800006
ISSN: 0265-931X
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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