Physiological and morphological responses induced by alpha-particle radiation on Arabidopsis thaliana embryos
文献类型： 外文期刊
作者： Ren, J. 1 ; Liu, L. 1 ; Jin, X. L. 2 ; Fu, S. L. 1 ; Ding, Z. C. 2 ;
作者机构： 1.Anhui Agr Univ, Coll Forestry & Landscape Architecture, Hefei, Peoples R China
2.Anhui Acad Agr Sci, Inst Agr Engn, Hefei, Peoples R China
3.Lakehead Univ, Fac Sci & Environm Studies, Thunder Bay, ON, Canada
关键词： Alpha-particle radiation;Arabidopsis embryos;Enzyme activity;Reactive oxygen species
期刊名称：GENETICS AND MOLECULAR RESEARCH （ 影响因子：0.764； 五年影响因子：0.912 ）
ISSN： 1676-5680
年卷期： 2014 年 13 卷 4 期
页码：
收录情况： SCI
摘要： Alpha (alpha)-particle radiation has been thoroughly studied in the occupational and residential environments, but biological mechanisms induced by alpha-particle radiation on plants are not clearly understood. In this study, radiation effects were examined using different total doses (1, 10, 100 Gy, respectively) of Am-241, alpha-particle on Arabidopsis embryos. No significant difference in the germination percentage was observed between the 3 levels of doses and the control. Germination speed and root length were increased by treatment with the 1-Gy dose of alpha-particles, and decreased by treatment with 10- and 100-Gy doses. Moreover, the bending degree of roots increased with radiation dose, and the roots showed an "S" shape when treated with the 100-Gy dose. Root bending under the 100-Gy dose was inhibited by scavengers of reactive oxygen species (ROS). Root gravitropism and root length may respond to the consistency of ROS induced by irradiation. Further analysis of the physiological effects revealed that an increase in alpha-particle radiation intensity enhanced the activity of catalase and the content of malondialdehyde, but superoxide dismutase activity was reduced by treatment with 100-Gy radiation of alpha-particles, suggesting that the high linear energy transfer of alpha-particles may cause a relatively high level of membrane lipid preoxidation and high accumulation of ROS. ROS showed both physiological and morphological responses following exposure to alpha-particle radiation in Arabidopsis embryos.
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