Abstract：
Due to the potential impacts of microplastics (MPs) and nanoplastics (NPs) on algal growth and thereby affect the climate-relevant substances, dimethylsulfoniopropionate (DMSP) and dimethyl sulfide (DMS), we studied the polystyrene (PS) MPs and NPs of 1 μm and 80 nm impacts on the growth, chlorophyll content, reactive oxygen species (ROS), antioxidant enzyme activity, and DMS/DMSP production in Emiliania huxleyi. E. huxleyi is a prominent oceanic alga that plays a key role in DMS and DMSP production. The results revealed that high concentrations of MPs and NPs inhibited the growth, carotenoid (Car), and Chl a concentrations of E. huxleyi. However, short-time exposure to low concentrations of PS MPs and NPs stimulated the growth of E. huxleyi. Furthermore, high concentrations of MPs and NPs resulted in an increase in the superoxide anion radical (O2.-) production rate and a decrease in the malondialdehyde (MDA) content compared with the low concentrations. Exposure to MPs and NPs at 5 mg L-1 induced superoxide dismutase (SOD) activity as a response to scavenging ROS. High concentrations of MPs and NPs significantly inhibited the production of DMSP and DMS. The findings of this study support the potential ecotoxicological impacts of MPs and NPs on algal growth, antioxidant system, and dimethylated sulfur compounds production, which maybe potentially impact the global climate.
摘要：
由于微塑料（MPs）和纳米塑料（NPs）对藻类生长的潜在影响，从而影响与气候相关的物质，二甲基磺丙酸酯（DMSP）和二甲基硫醚（DMS），我们研究了1μm和80nm的聚苯乙烯(PS)MPs和NPs对生长的影响，叶绿素含量，活性氧（ROS），抗氧化酶活性，和埃米利亚·赫克斯莱伊的DMS/DMSP生产。E.huxleyi是一种著名的海洋藻类，在DMS和DMSP生产中起着关键作用。结果表明，高浓度的MPs和NPs抑制了生长，类胡萝卜素（汽车），和Chl的浓度E.huxleyi。然而,短时间暴露于低浓度的PSMPs和NP刺激了胡氏大肠杆菌的生长。此外，高浓度的MP和NP导致超氧阴离子自由基（O2。-）与低浓度相比，生产率和丙二醛（MDA）含量降低。暴露于5mgL-1的MPs和NPs会诱导超氧化物歧化酶（SOD）活性，作为对清除ROS的反应。高浓度的MPs和NPs显著抑制DMSP和DMS的产生。这项研究的结果支持MPs和NPs对藻类生长的潜在生态毒理学影响，抗氧化系统，和二甲基含硫化合物的生产，这可能会影响全球气候。
