Influence of ocean acidification on thermal reaction norms of carbon metabolism in the marine diatom Phaeodactylum tricornutum

文献类型： 外文期刊

第一作者： Tong, Shanying

作者： Tong, Shanying;Wu, Hongyan;Xu, Dong;Wang, Yitao;Zhang, Xiansheng;Li, Yan;Ye, Naihao;Xu, Dong;Ye, Naihao

作者机构：

关键词： Carbon fixation; Ocean acidification; Phaeodactylum tricornutum; Phytoplankton; Respiration; Temperature; Warming

期刊名称：MARINE ENVIRONMENTAL RESEARCH （ 影响因子：3.13； 五年影响因子：4.368 ）

ISSN： 0141-1136

年卷期： 2021 年 164 卷

页码：

收录情况： SCI

摘要： Under the present CO2 condition, the efficiency of biological pump mediating carbon sequestration is predicted to decline in the future because respiration tends to be more sensitive to rising temperature than is photosynthesis. However, it remains unknown whether the impacts of global warming on metabolic rates of phytoplankton can be modulated by elevated CO2 induced ocean acidification. Here we show that in the model diatom species Phaeodactylum tricornutum, E-a (activation energy) of photosynthesis (similar to 0.5 eV) was significantly lower than that of respiration (1.8 eV), while CO2 concentration had no effect on the E-a value. E-h (deactivation energy) of respiration was increased to 2.5 eV, that was equivalent to E-h of photosynthesis in high CO2-grown cells and 28.4% higher than that in low CO2-grown ones. The respiration to photosynthesis ratio (R/P) was consistently higher in high CO2 condition, which increased with temperature at the beginning and subsequently decreased in both CO2 conditions. The ratio of R/P in high CO2 to R/P in low CO2 gradually increased with temperature above the optimal temperature. Our results imply that ocean acidification will aggravate the negative impacts or offset the alleviating effects of warming on the R/P ratio depending on the temperature range in Phaeodactylum tricornutum.

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