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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Stress tolerance and antioxidant enzymatic activities in the metabolisms of the reactive oxygen species in two intertidal red algae Grateloupia turuturu and Palmaria palmata
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Stress tolerance and antioxidant enzymatic activities in the metabolisms of the reactive oxygen species in two intertidal red algae Grateloupia turuturu and Palmaria palmata

机译：两种潮间红藻Grateloupia turuturu和Palaria palmata活性氧代谢中的耐逆性和抗氧化酶活性

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摘要

This investigation was designed to compare the differential stress tolerance in young thalli of two similar intertidal red seaweeds, Grateloupia turuturu Yamada and Palmaria palmata Kuntze, and to identify whether the invasive alga G. turuturu was more stress tolerant than P. palmata to cope with adverse environmental conditions. To do so, we measured the production of reactive oxygen caused by methyl viologen (MV) by assessing the oxidation of dichlorohydrofluorescein (DCFH) to dichlorofluorescein (DCF), the activities of reactive oxygen scavenging enzymes and the changes of the optimal fluorescence quantum yield (Fv/Fm) when the thalli of the two species were exposed to oxidative stresses caused by the addition of MV, H_2O_2, 3 (3, 4-dichlorophenyl)-1, 1-dimethyl urea (DCMU), heavy metal, changes of salinities, heat and freezing. Results demonstrated that the activities of superoxide dismutase (SOD) and peroxidase (POD) in G. turuturu were much higher than in P. palmata. Fv/Fm in G. turuturu was less sensitive than that in P. palmata to MV, H_2O_2, DCMU, heavy metal, salinity and heat stress, indicating that G. turuturu could be better acclimatized to changing environments and thus had a higher threshold for oxidative stress than P. palmata. C. turuturu was shown to be more sensitive to freezing treatment (-20 ℃), which explained why the appearance of G. turuturu was rarely reported in colder water environments.
机译：这项研究旨在比较两个相似的潮间红海藻Grateloupia turuturu Yamada和Palmaria palmata Kuntze在幼thalli中的不同压力耐受性，并确定侵入性藻类G. turuturu是否比P. palmata更耐压力，以应对不良反应。环境条件。为此，我们通过评估二氯氢荧光素（DCFH）向二氯荧光素（DCF）的氧化，活性氧清除酶的活性以及最佳荧光量子产率的变化，来测量由甲基紫精（MV）引起的活性氧的产生（ Fv / Fm）时，两个物种的拟南芥暴露于因添加MV，H_2O_2、3（3，4-二氯苯基）-1、1-二甲基脲（DCMU），重金属，盐度变化而引起的氧化胁迫下，热和冻结。结果表明，G。turuturu中的超氧化物歧化酶（SOD）和过氧化物酶（POD）的活性远高于P. palmata。 G. turuturu的Fv / Fm对MV，H_2O_2，DCMU，重金属，盐度和热应力的敏感性不如P. palmata，这表明G. turuturu可以更好地适应变化的环境，因此具有较高的阈值。氧化应激比掌形果。结果表明，C。turuturu对冷冻处理（-20℃）更敏感，这解释了为什么在较冷的水环境中很少报道G. turuturu的现象。

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