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Response of antioxidant enzymes in rice (Oryza sauva L. cv. Dongjin) under mercury stress

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Abstract

We studied the effects of different concentrations of mercury (0.0 to 100 µM) on growth and photosynthetic efficiency in rice plants treated for 21 d. In addition, we investigated how this metal affected the malondialdehyde (MDA) content as well as the activity of five antioxidant enzymes — superoxide dismutase (SOD), ascorbate peroxidase (APX), glutathione reductase (GR), guaiacol peroxidase (POD), and catalase (CAT). Photosynthetic efficiency (Fµ/Fm) and seedling growth decreased as the concentration of Hg was increased in the growth media. Plants also responded to Hg-induced oxidative stress by changing the levels of their antioxidative enzymes. Enhanced lipid peroxidation was observed in both leaves and roots that had been exposed to oxidative stress, with leaves showing higher enzymatic activity. Both SOD and APX activities increased in treatments with up to 50 µM Hg, then decreased at higher concentrations. In the leaves, both CAT and POD activities increased gradually, with CAT levels decreasing at higher concentrations. In the roots, however, CAT activity remained unchanged while that of POD increased a bit more than did the control for concentrations of up to 10 µM Hg. At higher Hg levels, both CAT and POD activities decreased. GR activity increased in leaves exposed to no more than 0.25 µM Hg, then decreased gradually. In contrast, its activity was greatly inhibited in the roots. Based on these results, we suggest that when rice plants are exposed to different concentrations of mercury, their antioxidative enzymes become involved in defense mechanisms against the free radicals that are induced by this stress.

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  1. Department of Biology, Dong-eui University, 614-714, Busan, Korea

    Mohammad Babar Ali, Hyun Sik Chun & Chin Bum Lee

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  1. Mohammad Babar Ali
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  2. Hyun Sik Chun
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  3. Chin Bum Lee
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Correspondence to Chin Bum Lee.

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Ali, M.B., Chun, H.S. & Lee, C.B. Response of antioxidant enzymes in rice (Oryza sauva L. cv. Dongjin) under mercury stress. J. Plant Biol. 45, 141–147 (2002). https://doi.org/10.1007/BF03030306

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