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Biochemical analysis of reactive oxygen species production and antioxidative responses in unripe avocado ( Persea americana Mill var Hass) fruits in response to wounding

机译:生化鳄梨果实中活性氧的产生和抗氧化反应的生化分析

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摘要

We analyzed the production of reactive oxygen species (ROS) and of detoxifying enzymes and enzymes of the ascorbate (ASC) acid cycle in avocado fruit (Pesea Americana Mill cv Hass) in response to wounding. The levels of superoxide anion (O2 −), hydroxyl radicals (OH.) and hydrogen peroxide (H2O2) increased at 15 min and 2 and 15 h post-wounding. Peroxidase (POD) activity had increased to high levels 24 h after wounding; in contrast, catalase and superoxide dismutase (SOD) levels hat decreased significantly at 24 h post-treatment. Basic POD was the major POD form induced, and the levels of at least three apoplastic POD isozymes –increased following wounding. Using specific inhibitors, we characterized one MnSOD and two CuZnSOD isozymes. CuZnSOD activities decreased notably 12 h after treatment. The activities of dehydroascorbate reductase and glutathione reductase increased dramatically following the wounding treatment, possibly as a means to compensate for the redox changes due to ROS production. Keywords Antioxidative enzymes - Avocado - Reactive oxygen species - Wounding
机译:我们分析了鳄梨果实(Pesea Americana Mill cv Hass)中的活性氧(ROS)和解毒酶的产生以及抗坏血酸(ASC)酸循环的酶对伤口的反应。超氧阴离子(O 2 -),羟基自由基(OH 。)和过氧化氢(H 2 > O 2 )在伤后15分钟,2和15小时增加。伤后24小时过氧化物酶(POD)活性增加至高水平;相反,过氧化氢酶和超氧化物歧化酶(SOD)的水平在治疗后24小时明显降低。基本POD是诱导的主要POD形式,受伤后至少增加了3种质外生POD同工酶的水平。使用特定的抑制剂,我们表征了一种MnSOD和两种CuZnSOD同工酶。处理后12 h CuZnSOD活性明显下降。伤口处理后,脱氢抗坏血酸还原酶和谷胱甘肽还原酶的活性急剧增加,这可能是补偿由于ROS产生引起的氧化还原变化的一种手段。关键词抗氧化酶鳄梨活性氧伤口

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