文献类型： 外文期刊

第一作者： Wang, Wen Jun

作者： Wang, Wen Jun;Li, Xiao Lei;Liang, Zhou Rui;Liu, Fu Li;Sun, Xiu Tao;Wang, Fei Jiu;Wang, Wen Jun;Li, Xiao Lei;Liang, Zhou Rui;Liu, Fu Li;Zhu, Jian Yi;Shen, Zong Gen

作者机构：

关键词： Antioxidase; Catalase; Glutathione reductase; Hypersalinity; Hyposalinity; Peroxidase; Superoxide dismutase; The maximum quantum yield of PSII

期刊名称：AQUATIC BOTANY （ 影响因子：2.473； 五年影响因子：2.417 ）

ISSN： 0304-3770

年卷期： 2019 年 154 卷

页码：

收录情况： SCI

摘要： Bangia is an ancient and genetically diverse red algae genus, containing one freshwater species. It has been reported that freshwater Bangia acclimates seawater and marine Bangia survives freshwater after gradual adaptation or one to several steps transfer. However, little is known about the acclimation mechanism. The present study revealed that marine Bangia tolerated moderate hyposalinity and freshwater Bangles endured seawater as indicated by the maximum quantum yield of PSII (F-v/F-m). Little reduction of F-v/F-m occurred in 100% seawater treated freshwater Bangia and there was no significant difference of F-v/F-m under different hypersalinity on the 5th day. The O-2 center dot(-) levels were lower than control while accumulation of H2O2 was observed in the hypersalinity-treated freshwater Bangia and hyposalinity-treated marine Bangia. There was a correlation between O-2 center dot(-) and superoxide dismutase induction, resulting in effective removal of O-2 center dot(-). Mono- to multi-phasic induction of peroxidase occurred in hyposaline stressed marine Bangia and induction of catalase was present in hypersaline stressed freshwater Bangia. The F-v/F-m reduction was the highest in 100% freshwater-treated marine Bangia, while neither peroxidase nor catalase activity was enhanced. The giutathione reductase activities exhibited triphasic induction in 100% freshwater-treated marine Bangia and 100% seawater-treated freshwater Bangia, indicating that glutathione reductase played important roles under highly saline stress. In sum, the antioxidant enzymes activities were peroxidase > superoxide dismutase > glutathione reductase > catalase. The H2O2 and antioxidases was less induced and F-v/F-m was less reduced in seawater-stressed freshwater Bangia than in freshwater-stressed marine Bangia in most cases. The results suggested a higher capacity of freshwater Bangles endurance to seawater than marine Bangia endurance to freshwater.

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