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Lanqing Wang, Yinfeng Li, Dehai Liu, Chaohui Zhang, Yuancheng Qi, Yuqian Gao, Jinwen Shen, and Liyou Qiu

international units (IU) per gram dry weight of spawn (1 IU = quantity of enzyme required to produce 1 μmol of glucose per minute under the assay conditions). The isozyme patterns of esterase, peroxidase, and polyphenol oxidase of immobilized spawn and solid

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Shiow Y. Wang, Kim S. Lewers, Linda Bowman, and Min Ding

main antioxidant enzymes in strawberry fruit are superoxide dismutase (SOD), guaiacol peroxidase (G-POD), glutathione peroxidase (GSH-POD), ascorbate peroxidase (AsA-POD), monodehydroascorbate reductase (MDAR), dehydroascorbate reductase (DHAR), and

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Na Zhang, Lu Han, Lixin Xu, and Xunzhong Zhang

). Ascorbate peroxidase is a H 2 O 2 -scavenging enzyme that is unique to plants and is indispensable to protect chloroplasts and other cellular constituents from damage caused by H 2 O 2 and hydroxyl radicals (•HO) produced from it ( Asada, 1992 ). Better

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Yali He and Bingru Huang

substrates, and it is therefore likely to be central in the defense mechanism ( Bowler et al., 1992 ). Hydrogen peroxide is scavenged by catalase (CAT) and peroxidases, which convert hydrogen peroxide to water and molecular oxygen ( Bowler et al., 1992

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Jing Tian, Li-Ping Wang, Yan-Juan Yang, Jin Sun, and Shi-Rong Guo

reduction of nitroblue tetrazolium (NBT), which was monitored at 560 nm using a spectrophotometer (WFZ ultraviolet/VIS-2600; UNIC, Shanghai, China). Peroxidase (POD) (EC 1.11.1.7) activity was measured according to Kochba et al. (1977) , and one unit of

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Xunzhong Zhang, Damai Zhou, Erik H. Ervin, Greg K. Evanylo, Derik Cataldi, and Jinling Li

H 2 O 2 , and 0.1 mL enzyme extract. Ascorbate peroxidase activity. APX activity was assayed by following the decline in absorbance at 290 nm as a result of ascorbate acid oxidation (ɛ = 2.8 m m −1 ·cm −1 ) for 1 min. The reaction mixture contained 0

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Ju Ding, Kai Shi, Yan-Hong Zhou, and Jing-Quan Yu

). In cucumber plants, increased activities of peroxidase (POD) and polyphenoloxidase (PPO) enzymes, which are involved in the metabolism of polyphenols, have been suggested as a factor contributing to BR-induced disease resistance ( Khripach et al

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Lixin Xu, Mili Zhang, Xunzhong Zhang, and Lie-Bao Han

Bergmeyer (1974) . Leaf sample (200 mg) was homogenized in 3 mL of 100 m m sodium phosphate buffer (pH 6.8) and the extracts were centrifuged at 16,000 g n for 5 min at 4 °C. Then 0.17 mL of supernatant was added to 0.83 mL peroxidase reagent containing

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Xinhua Zhang, Fujun Li, Nana Ji, Shujun Shao, Dongyang Wang, Ling Li, and Fansheng Cheng

activity during the entire storage periods ( Fig. 5D ). Fig. 5. Effect of methyl jasmonate (MeJA) treatment on superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and peroxidase (POD) activities in tomato fruit during storage at 2 °C

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Yiwei Jiang, Eric Watkins, Shuwei Liu, Xiaoqing Yu, and Na Luo

different cellular locations ( Alscher et al., 2002 ). The H 2 O 2 can be decomposed through cycles of ascorbate-glutathione, glutathione peroxidase, and catalase (CAT) ( Mittler, 2002 ). The mechanisms of these antioxidative pathways suggest that