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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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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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Qiang Liu and Yiwei Jiang

activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and ascorbate peroxidase (APX), and malondialdehyde (MDA) content across two creeping bentgrass cultivars. Other studies have shown that submergence either decreases or enhances plant

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Rumana Yeasmin, Stephen P. Bonser, Satoru Motoki and Eiji Nishihara

dismutase (SOD), ascorbate peroxidase (APX), peroxidase, catalase, or glutathione reductase ( Zhu et al., 2010 ). The mechanisms underlying the influence of AMF on the ROS metabolism of host plants under heat stress conditions remain uncertain. AMF are well

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Giacomo Cocetta, Ilaria Mignani and Anna Spinardi

activity of ascorbate peroxidase ( A ), monodehyroascorbate reductase ( B ), dehydroascorbate reductase ( C ), and glutathione reductase ( D ) during storage of ‘Passe-Crassane’ pears. Values are means of four replicates. Asterisks indicate differences

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Xiao-Juan Wei, Jinlin Ma, Kun Wang, Xiao-Jing Liang, Jin-Xuan Lan, Yue-Juan Li, Kai-Xiang Li and Haiying Liang

. Activities of peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), superoxide dismutase (SOD), and polyphenol oxidase (PPO), and level of malondialdehyde (MAD) in young and old leaves of paclobutrazol-treated and untreated C. chrysantha plants

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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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Federica Galli, Douglas D. Archbold and Kirk W. Pomper

superoxide dismutase (SOD), catalase (CAT), and the ascorbate–glutathione cycle ( Asada, 1994 ; Noctor and Foyer, 1998 ). The major components of this cycle include glutathione reductase, ascorbate peroxidase, and antioxidant compounds such as ascorbate and

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Erik H. Ervin, Xunzhong Zhang and John H. Fike

High ultraviolet-B (UV-B; 290-320nm wavelength) may significantly contribute to kentucky bluegrass (Poa pratensis L.) sod death at harvest and transplanting. As terrestrial UV-B levels continue to increase due to a depletion of the stratospheric ozone layer this problem may worsen. Epidermal attenuation from pigments and detoxification of reactive oxygen species by antioxidant metabolites and enzymes are involved in plant defense against oxidative stress caused by UV-B. Our objective was to determine whether the attenuation and detoxification systems of kentucky bluegrass could be artificially boosted by exogenous applications of ascorbic acid (AA), alpha-tocopherol (AT), or a colorant before exposure to high levels of UV-B. Ascorbic acid, AT, and the colorant Green Lawnger (GL), were applied to plugs of mature kentucky bluegrass alone or in combination, and then subjected to artificial, continuous UV-B exposure (70 μmol·m-2·s-1); three greenhouse experiments were conducted. By 3 to 5 days after UV-B initiation, visual quality and photochemical efficiency, as measured by chlorophyll fluorescence were significantly reduced. However, in Expt. 1, AA alleviated decline of visual quality, delayed loss of photochemical efficiency, and increased recovery relative to the control. In Expt. 3, decreased endogenous AT and antioxidant enzyme activities were measured due to UV-B stress. Application of AA, AA + AT, or GL partially alleviated photochemical efficiency decline from 4 to 12 days after initiation of UV-B. In addition, application of the chemical treatments increased leaf tissue AT concentrations by 32% to 42%, increased SOD activity by 30% to 33% and increased catalase activity by 37% to 59%, relative to the control as measured 10 days after UV-B initiation. Greater AT concentration and SOD and catalase activities were associated with greater visual quality under UV-B stress. The results of these studies indicate that kentucky bluegrass UV-B tolerance may be increased by supplementing its pigment and antioxidant defense systems with foliar applications of AA, AT or GL.

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Martha Edith López-López, José Ángel López-Valenzuela, Francisco Delgado-Vargas, Gabriela López-Angulo, Armando Carrillo-López, Lidia Elena Ayón-Reyna and Misael Odín Vega-García

concentration were calculated based on its extinction coefficient (43.6 m −1 ·cm −1 ) at 240 nm. CAT activity was expressed in units per milligram of protein. Ascorbate peroxidase. The APX activity was determined with the same extract used for evaluation of CAT