An Explanation Based on Energy-Related Changes for Blue Mussel Mytilus edulis Coping With Seawater Acidification.
An Explanation Based on Energy-Related Changes for Blue Mussel Mytilus edulis Coping With Seawater Acidification.
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基于蓝贻贝应对海水酸化的能量相关变化的解释
DOI：
10.3389/fphys.2021.761117
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发表时间：
2021
影响因子：
4
通讯作者：
Wang Y
中科院分区：
文献类型：
--
作者：
Guo Y;Zhou B;Sun T;Zhang Y;Jiang Y;Wang Y
随着海洋酸化（OA）逐渐加剧，人们越来越关注其对海洋生物的生态影响。我们的前期研究表明海水酸化对紫贻贝的生理过程产生不利影响，本研究的目的是获得能量相关证据来验证和解释我们的前期研究结果。因此，建立了相同的酸化系统（pH：7.7或7.1;酸化方法：HCl添加或CO2富集;实验周期：21 d），并评估了与能量相关的变化。结果表明，酸化处理后，能荷（EC）和反映ATP合成速率的细胞色素C氧化酶（考克斯）基因表达量显著增加。更重要的是，暴露在酸化环境中的贻贝将更多的能量分配给鳃和血细胞。而M. pH7.1时，CO2处理组较对照组显著降低（P <0.01）。在相同pH条件下，CO2处理组TAP、ATP和COXs基因表达量均显著低于HCl处理组，说明CO2诱导的酸化对M. edulis和CO2溶解产生的H+以外的离子是可能的原因。总之，M. edulis对海水酸化反应活跃，且随酸化程度的不同而变化，但在较高的酸化程度下，它们所受的限制表明M. edulis对未来OA增加的耐受性有限。
As ocean acidification (OA) is gradually increasing, concerns regarding its ecological impacts on marine organisms are growing. Our previous studies have shown that seawater acidification exerted adverse effects on physiological processes of the blue mussel Mytilus edulis, and the aim of the present study was to obtain energy-related evidence to verify and explain our previous findings. Thus, the same acidification system (pH: 7.7 or 7.1; acidification method: HCl addition or CO2 enrichment; experimental period: 21d) was set up, and the energy-related changes were assessed. The results showed that the energy charge (EC) and the gene expressions of cytochrome C oxidase (COX) reflecting the ATP synthesis rate increased significantly after acidification treatments. What’s more, the mussels exposed to acidification allocated more energy to gills and hemocytes. However, the total adenylate pool (TAP) and the final adenosine triphosphate (ATP) in M. edulis decreased significantly, especially in CO2 treatment group at pH 7.1. It was interesting to note that, TAP, ATP, and COXs gene expressions in CO2 treatment groups were all significantly lower than that in HCl treatment groups at the same pH, verifying that CO2-induced acidification exhibited more deleterious impacts on M. edulis, and ions besides H+ produced by CO2 dissolution were possible causes. In conclusion, energy-related changes in M. edulis responded actively to seawater acidification and varied with different acidification conditions, while the constraints they had at higher acidification levels suggest that M. edulis will have a limited tolerance to increasing OA in the future.
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