Volume 46, Number 6, 2011ICRER 2011 – International Conference on Radioecology & Environmental Radioactivity: Environment & Nuclear Renaissance
|Page(s)||S401 - S407|
|Section||Mechanisms and Models|
|Published online||09 January 2012|
Study of biological effects and oxidative stress related responses in gamma irradiated Arabidopsis thalianaplants
1 Belgian Nuclear Research Centre, Biosphere Impact Studies, 2400 Mol, Belgium
2 Hasselt University, Centre for Environmental Sciences, 3590 Diepenbeek, Belgium
This study aimed at investigating biological effects in Arabidopsis thalianaleaves and roots irradiated for 72 h with 3.5 Gy or 30 Gy of gamma radiation, and to unravel oxidative stress related responses to achieve a better understanding of the importance of the cellular redox balance as a modulator in gamma radiation stress. A. thaliana performs like a rather radioresistant plant species as no alterations on growth and only minor alterations in the nutrient profile were observed. Gamma irradiation did not seem to induce an NADPH mediated oxidative burst and lipid peroxidation appeared to be directly induced by ionizing radiation rather than mediated through LOX activity. As ionizing radiation can cause indirect damage via water radiolysis, H2O2 is hypothesized to be an important reactive oxygen species under radiation stress. Although most H2O2-scavenging enzymes remained unchanged, important alterations were observed for CAT1, CAT2 and CAT3expression.
© Owned by the authors, published by EDP Sciences, 2011
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