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Open AccessArticle

β-Radiation Stress Responses on Growth and Antioxidative Defense System in Plants: A Study with Strontium-90 in Lemna minor

1
SCK•CEN, Belgian Nuclear Research Centre, Boeretang 200, 2400 Mol, Belgium
2
Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium
3
Centre for Environmental Research, University of Hasselt, Universiteitslaan 1, 3590 Diepenbeek, Belgium
4
Veterinary Sciences, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Ann Cuypers
Int. J. Mol. Sci. 2015, 16(7), 15309-15327; https://doi.org/10.3390/ijms160715309
Received: 28 May 2015 / Revised: 23 June 2015 / Accepted: 26 June 2015 / Published: 7 July 2015
(This article belongs to the Special Issue Abiotic Stress and Gene Networks in Plants)
In the following study, dose dependent effects on growth and oxidative stress induced by β-radiation were examined to gain better insights in the mode of action of β-radiation induced stress in plant species. Radiostrontium (90Sr) was used to test for β-radiation induced responses in the freshwater macrophyte Lemna minor. The accumulation pattern of 90Sr was examined for L. minor root and fronds separately over a seven-day time period and was subsequently used in a dynamic dosimetric model to calculate β-radiation dose rates. Exposing L. minor plants for seven days to a 90Sr activity concentration of 25 up to 25,000 kBq·L−1 resulted in a dose rate between 0.084 ± 0.004 and 97 ± 8 mGy·h−1. After seven days of exposure, root fresh weight showed a dose dependent decrease starting from a dose rate of 9.4 ± 0.5 mGy·h−1. Based on these data, an EDR10 value of 1.5 ± 0.4 mGy·h−1 was estimated for root fresh weight and 52 ± 17 mGy·h1 for frond fresh weight. Different antioxidative enzymes and metabolites were further examined to analyze if β-radiation induces oxidative stress in L. minor. View Full-Text
Keywords: radiation responses; abiotic stress; dosimetry; Lemna minor; oxidative stress; strontium-90 radiation responses; abiotic stress; dosimetry; Lemna minor; oxidative stress; strontium-90
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MDPI and ACS Style

Van Hoeck, A.; Horemans, N.; Van Hees, M.; Nauts, R.; Knapen, D.; Vandenhove, H.; Blust, R. β-Radiation Stress Responses on Growth and Antioxidative Defense System in Plants: A Study with Strontium-90 in Lemna minor. Int. J. Mol. Sci. 2015, 16, 15309-15327.

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