Ocean acidification influences photosynthesis, respiration, and metabolism in marine diatoms, leading to changes in diatom growth performance and shifts in phytoplankton communities. Previous studies have demonstrated that increases in seawater CO2 concentrations affect the uptake of trace metals such as iron, zinc, copper, and cobalt by marine diatoms. However, the influence of increased CO2 on calcium, which plays a vital role as a secondary messenger in various signaling pathways within organisms, has received limited attention so far. This study examined the effect of increased CO2 on Ca homeostasis and signaling in the marine diatom Phaeodactylum tricornutum. While seawater acidification had little effect on the diatom's growth, it significantly changed cell properties (surface topography, adhesion, and surface potential). Elevated CO2 concentrations reduced calcium accumulation P. tricornutum and lowered the rise of cytosolic Ca2+ transients stimulated by toxic aldehyde, phosphorus supplement, and hypo‐osmotic stress. Our results suggest that a continuous rise in atmospheric CO2 may alter diatoms' response to environmental cues.

中文翻译：

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增加二氧化碳对海洋硅藻钙稳态和信号传导的影响

海洋酸化影响海洋硅藻的光合作用、呼吸和代谢，导致硅藻生长性能的变化和浮游植物群落的变化。先前的研究表明，海水中CO2的增加2浓度影响海洋硅藻对铁、锌、铜和钴等微量金属的吸收。然而，CO增加的影响2钙作为生物体内各种信号通路中的第二信使发挥着至关重要的作用，迄今为止受到的关注还很有限。这项研究检验了增加二氧化碳的影响2海洋硅藻中 Ca 稳态和信号传导三角褐指藻。虽然海水酸化对硅藻的生长影响不大，但它显着改变了细胞特性（表面形貌、粘附力和表面电位）。二氧化碳浓度升高2浓度减少钙积累三角褐藻并降低胞浆 Ca 的升高2+有毒醛、磷补充剂和低渗应激刺激的瞬变。我们的研究结果表明，大气中二氧化碳含量持续上升2可能会改变硅藻对环境信号的反应。