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Zhimin Yang, Jingjin Yu, Emily Merewitz, and Bingru Huang

rate of p-nitro blue tetrazolium chloride reduction at 560 nm ( Giannopolities and Rise, 1977 ). The activity of peroxidase (EC and ascorbate peroxidase (EC was determined by measuring the changes in absorbance at 470 and 290 nm

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Safwan Shiyab

. Fig. 7. Effect of chromium (Cr) on the activity of antioxidant enzymes, hydroxides, and lipid peroxidase in the shoots of sour orange seedlings. Vertical bars represent ± sd. Values with the same letter are not significantly different at the 5% level

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Lixin Xu, Liebao Han, and Bingru Huang

enzymes such as superoxide dismutase, catalase, peroxidases, monodehydroascorbate reductase (MR), glutathione reductase (GR), dehydroascorbate reductase (DR), and other nonenzymatic constituents such as α-tocopherol, ascorbate, and reduced glutathione; the

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Dawei Shi, Xiaodong Wei, Guoxiang Chen, and Yanli Xu

), and various peroxidases such as guaiacol peroxidase and ascorbate peroxidase (APX) are the primary antioxidant enzymes. In conjunction with these enzymes, antioxidant compounds such as ascorbate and glutathione also play important roles in maintaining

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Feifei Li, Da Zhan, Lixin Xu, Liebao Han, and Xunzhong Zhang

, H 2 O 2 is finely regulated by CAT and an array of peroxidases localized in almost all compartments of the plant cell such as APX ( Blokhina et al., 2003 ). Heat-induced oxidative stress has been reported in creeping bentgrass [ Agrostis stolonifera

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Naveen Kumar and Robert C. Ebel

A ). Highest LOX specific activity (1.33 ∆ A 234 min −1 ·mg −1 TSP) was observed at 3 DAT. Fig. 2. ( A ) Specific lipoxygenase (LOX) activity (n = 15), ( B ) specific ascorbate peroxidase (APOD) activity (n = 15), ( C ) specific glutathione

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Kevin Laskowski and Emily Merewitz

extractions were centrifuged at 5000 g n for 30 min at 4 °C, and supernatant was collected for subsequent enzyme assay and quantification. Ascorbate peroxidase (APX) activity was measured based on the oxidation of ascorbate as described by Nakano and Asada

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Qi Wang, Rui Zhao, Qihang Chen, Jaime A. Teixeira da Silva, Liqi Chen, and Xiaonan Yu

the plant in response to severe drought stress, it was damaged at early growth stages. Fig. 5. Activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX) of two herbaceous peony cultivars under drought

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Zhengke Zhang, Yu Zhang, Donald J. Huber, Jingping Rao, Yunjing Sun, and Shanshan Li

cellular oxidative metabolism involving oxidative enzymes, including peroxidase (POD) and polyphenol oxidase (PPO) ( Hershkovitz et al., 2005 ). Oxidative stress could also be promoted by the presence of excess reactive oxygen species (ROS) that induce

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Xiaoyuan Feng, Baogang Wang, Wensheng Li, Lei Shi, Jiankang Cao, and Weibo Jiang

., 2003 ). Previous studies showed that β-1,3-glucanases, chitinases, peroxidase, and phenylalanine ammonia-lysase (PAL) were closely related to induction of disease resistance in fruits ( Cao et al., 2006 ; Liu et al., 2005 ; Qin et al., 2003 ). The