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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/27678


    標題: Oxidative effects and metabolic changes following exposure of greater duckweed (Spirodela polyrhiza) to diethyl phthalate
    作者: Cheng, Lee-Ju
    Cheng, Tai-Sheng
    貢獻者: 生活應用與保健系
    關鍵字: Diethyl Phthalate
    Oxidative Stress
    Allelochemical
    Spirodela Polyrhiza
    日期: 2012-03
    上傳時間: 2014-03-21 16:17:22 (UTC+8)
    出版者: Elsevier Science Bv
    摘要: The toxicity and effects of diethyl phthalate (DEP), a potent allelochemical, on the growth of greater duckweed were studied. Biochemical analyses and physiological methods were combined to investigate oxidative stress, adverse effects and their mechanisms in greater duckweeds grown in 0-2 mM of diethyl phthalate (DEP) after cultivation for 7 days. The results showed that J-shaped concentration response curves were displayed in hydrogen peroxide (H2O2), ascorbic acid (ASA) and dehydroascorbate (DHA) levels, and ascorbate peroxidase (APX) and gualacol peroxidase ( POD) activities, indicating reduced oxidative stress and toxic effect. The inverted U-shaped curves were exhibited in relative growth rate (RGR), fresh weight/dry weight (FW/DW) ratio, total chlorophyll content, total soluble thiols, and glutathione reductase (GR) activity, revealing beneficial effect in plant growth. The inverted U-shaped curves were also found in malondialdehyde (MAD) and superoxide radical (O-2(center dot-)). contents with the increasing concentration of DEP, indicative of enhanced oxidative stress. The results suggest that DEP is toxic to the greater duckweed by inducing oxidative stress and antioxidative enzymes may play important roles in the defense strategy against DEP toxicity. (C) 2011 Elsevier B.V. All rights reserved.
    Appears in Collections:[生活應用與保健系] 期刊論文

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