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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Salinity-induced oxidative stress and regulation of antioxidant defense system in the marine macroalga Ulva prolifera
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Salinity-induced oxidative stress and regulation of antioxidant defense system in the marine macroalga Ulva prolifera

机译：盐度诱导的海洋大型藻类植物增生中的氧化应激和抗氧化防御系统的调控

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摘要

The physiological and biochemical responses to salinity stresses in Ulva prolifera were investigated, including growth rate, level of oxidative stress and regulation of antioxidant defense system. A six-day exposure to hyposaline (10‰) and hypersaline (60‰) conditions resulted in a significant decrease in growth rate and maximum photosynthetic quantum efficiency (Fv/Fm) compared with the control (30‰). Increases in H_2O_2 contents correlated to the level of lipid peroxidation, which suggested that oxidative damage occurred in salinity stress and was more severe at 60‰ than at 10‰. The amount of total soluble protein (TSP) significantly increased in a hypersaline condition. The fluctuations of four antioxidant substrates and four antioxidant enzymes were determined after the long-term salinity stress. Compared to growth at 30‰, low salinities led to a major increase in activities of catalase (CAT), superoxide dismutase (SOD) and glutathione reductase (GR), coupled with an increase in contents of ascorbate, glutathione and β-carotenoid. Thalli exposed to hypersaline conditions rapidly accumulated glutathione and did not affect the content of ascorbate, α-tocopherol and (J-carotenoid. The activities of CAT, SOD, ascorbate peroxidase (APX) and GR increased in hypersaline conditions, suggesting that reactive oxygen scavenging enzymes played an important role in U. prolifera for adapting to the hypersaline condition. The alterations in antioxidant enzymes and substrates are not consistent between hyposaline and hypersaline stresses in U. prolifera, but the regulation of antioxidant defense system was a vital tolerance mechanism involved in the oxidative stress.
机译：研究了Ulva增殖中盐分胁迫的生理生化反应，包括生长速率，氧化应激水平和抗氧化防御系统的调节。与对照（30‰）相比，在次盐水（10‰）和高盐（60‰）条件下暴露6天会导致生长速率和最大光合量子效率（Fv / Fm）显着下降。 H_2O_2含量的增加与脂质过氧化水平相关，表明盐分胁迫下发生氧化损伤，在60‰处比在10‰处更为严重。在高盐条件下，总可溶性蛋白（TSP）的量显着增加。在长期盐度胁迫下测定了四种抗氧化剂底物和四种抗氧化酶的波动。与30‰的增长相比，低盐度导致过氧化氢酶（CAT），超氧化物歧化酶（SOD）和谷胱甘肽还原酶（GR）的活性大大增加，同时抗坏血酸，谷胱甘肽和β-类胡萝卜素的含量也增加。 Thalli暴露于高盐条件下会迅速累积谷胱甘肽，并且不影响抗坏血酸，α-生育酚和（J-类胡萝卜素）的含量。在高盐条件下，CAT，SOD，抗坏血酸过氧化物酶（APX）和GR的活性增加，表明活性氧清除酶在U. prolifera适应高盐条件中起着重要作用，抗氧化剂酶和底物的变化在U. prolifera的低盐和高盐胁迫之间不一致，但抗氧化防御系统的调节是参与其中的重要耐受机制。氧化应激。

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    Min Bo Luo; Feng Liu;

  • 作者单位

    Key and Open Laboratory of Marine and Estuarine Fisheries Resources and Ecology, Ministry of Agriculture, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 300Jungong Road, Shanghai 200090, PR China;

    Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qjngdao 266071, PR China;

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  • 正文语种 eng
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  • 关键词

    antioxidant enzyme; catalase; oxidative stress; salinity; ulva protifera;

    机译：抗氧化酶过氧化氢酶氧化应激盐度;腐霉;

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