Effects of Hydrogen Peroxide on Cyanobacterium Microcystis aeruginosa in the Presence of Nanoplastics
Effects of Hydrogen Peroxide on Cyanobacterium Microcystis aeruginosa in the Presence of Nanoplastics
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DOI：
10.1021/acsestwater.1c00090
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发表时间：
2021-06-17
期刊：
影响因子：
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通讯作者：
Sinton, David
中科院分区：
文献类型：
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作者：
Guo, Yawen;O'Brien, Anna M.;Sinton, David
过氧化氢（H2O2）是一种常见的蓝藻有害藻华（cyanoHABs）的控制措施，但当地的污染物可能会改变其效果。在这里，我们的目标是了解控制cyanoHABs的过氧化氢在光的纳米塑料污染使用的多应激框架。我们利用高通量全因子实验来捕获H2O2，纳米塑料，温度和光照对淡水蓝藻铜绿微囊藻的产藻菌株的多应激因子影响。除了揭示H2O2和纳米塑料对细胞丰度和微囊藻毒素产生的独立抑制作用外，我们的高通量系统还确定了非加性的交互作用。具体来说，我们发现纳米塑料减弱了H2O2对细胞丰度和微囊藻毒素产生的抑制作用。此外，我们发现纳米塑料限制了H2O2的降解，部分解释了这种非加性效应。由于H2O2和纳米塑料的结合仍然抑制了增长，我们预计即使在背景纳米塑料污染的情况下，H2O2也将仍然是一种有效的控制措施。我们的研究结果说明了在H2O2用于控制氰型HABs之前，考虑当地压力源（包括纳米塑料等人为污染物）的重要性。
Hydrogen peroxide (H2O2) is a common control measure for cyanobacterial harmful algal blooms (cyanoHABs), but local contaminants may alter its effects. Here, we aim to understand the control of cyanoHABs by H2O2 in light of nanoplastic contamination using a multistressor framework. We utilized a high-throughput full-factorial experiment to capture the multistressor impacts of H2O2, nanoplastics, temperature, and light on a toxigenic strain of the freshwater cyanobacterium Microcystis aeruginosa. In addition to revealing independent inhibitory effects of H2O2 and nanoplastics on cell abundance and microcystin production, our high-throughput system also identified non-additive, interactive effects. Specifically, we found that nanoplastics weakened the inhibitory effects of H2O2 on cell abundance and microcystin production. In addition, we discovered that nanoplastics restricted the degradation of H2O2, partially explaining this non-additive effect. Because combined H2O2 and nanoplastic still curbed growth, we expect H2O2 will remain an effective control measure even with background nanoplastic pollution. Our findings illustrate the importance of taking local stressors, including anthropogenic contaminants such as nanoplastics, into account before H2O2 is applied to control cyanoHABs.