Abstract
The present study evaluated the impact of cesium (133Cs) at four concentrations (0, 0.001, 0.01, and 0.1 mg L−1) on growth, concentrations of chlorophyll and carotenoid pigments, and oxidative stress responses in the charophyte, Nitella pseudoflabellata, over 30 days. Oxidative stress was quantified by measuring anti-oxidant enzyme activities and H2O2 content. When compared with the control, significantly elevated activity levels of the anti-oxidative enzymes ascorbic peroxidase, catalase and guaiacol peroxidase were observed at 0.1 mg L−1 (all p < 0.05), even though the H2O2 level was not significantly elevated. Carotenoid and chlorophyll a and b pigment levels were significantly reduced (all p < 0.05) at Cs exposures of 0.01 and 0.1 mg L−1. Photosynthetic efficiency (i.e., Fv/Fm) was significantly reduced (p < 0.05) at Cs concentrations ≥0.001 mg L−1. Significant reduction (p < 0.05) of plant growth (i.e., shoot length) was also observed after 1 week of exposure at Cs concentrations ≥0.001 mg L−1. Our results suggested that Cs exposure reduced plant growth and affected plant functioning via activating the defense mechanism against oxidative stress in Nitella.
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Acknowledgments
This research was supported financially by grants from the Ministry of Education, Culture, Sports, Science and Technology (Research Grant-in-Aid), Japan; River Foundation and the Japanese Society for the Promotion of Science (Wakate-kenkyu B: 25820221). The assistance of others at the Ecological Engineering Laboratory, Saitama University, during laboratory analyses is gratefully acknowledged. Two anonymous reviewers are acknowledged for their constructive comments.
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Atapaththu, K.S.S., Rashid, M.H. & Asaeda, T. Growth and Oxidative Stress of Brittlewort (Nitella pseudoflabellata) in Response to Cesium Exposure. Bull Environ Contam Toxicol 96, 347–353 (2016). https://doi.org/10.1007/s00128-016-1736-4
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DOI: https://doi.org/10.1007/s00128-016-1736-4