微塑料削弱了蓝藻聚球藻的适应性。海洋变暖,Environmental Science & Technology

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微塑料削弱了蓝藻聚球藻的适应性。海洋变暖
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-06-08 , DOI: 10.1021/acs.est.3c01133
Hui Zeng ₁ , Xiangang Hu ₁ , Shaohu Ouyang ₁ , Qixing Zhou ₁

Affiliation

人类活动引起的海洋变暖（OW）威胁着海洋生态系统。此外，全球海洋中的微塑料（MP）污染也在增加。然而，OW 和 MPs 对海洋浮游植物的综合影响尚不清楚。聚球藻是最普遍存在的自养蓝藻，用于评估两种变暖情景（28 和 32 °C 与 24 °C）下对 OW + MP 的反应。MP 暴露削弱了 OW 下细胞生长速率和碳固定的增强作用。具体而言，OW + MPs 在 28 °C 和 32 °C 下分别使碳固定减少了 10.9% 和 15.4%。此外，聚球藻的光合作用色素含量减少sp。OW 下的经济增长在 OW + MPs 下得到加强，支持 OW + MPs 下较低的增长率和碳固定。转录组可塑性（基因表达响应环境变化的进化和适应性潜力）使聚球藻成为可能。开发 OW 下的变暖适应性转录谱（光合作用和 CO ₂固定的下调）。_{然而，在OW + MPs下，光合作用和CO 2}固定的下调得到缓解，从而提高了对不利影响的反应能力。由于聚球藻丰度高sp。及其对初级生产的贡献，这些发现对于理解全球变暖下 MP 对碳固定和海洋碳通量的影响非常重要。

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Microplastics Weaken the Adaptability of Cyanobacterium Synechococcus sp. to Ocean Warming

Ocean warming (OW) caused by anthropogenic activities threatens ocean ecosystems. Moreover, microplastic (MP) pollution in the global ocean is also increasing. However, the combined effects of OW and MPs on marine phytoplankton are unclear. Synechococcus sp., the most ubiquitous autotrophic cyanobacterium, was used to evaluate the response to OW + MPs under two warming scenarios (28 and 32 °C compared to 24 °C). The enhancement of the cell growth rate and carbon fixation under OW were weakened by MP exposure. Specifically, OW + MPs reduced carbon fixation by 10.9 and 15.4% at 28 and 32 °C, respectively. In addition, reduction in photosynthesis pigment contents of Synechococcus sp. under OW was intensified under OW + MPs, supporting the lower growth rate and carbon fixation under OW + MPs. Transcriptome plasticity (the evolutionary and adaptive potential of gene expression in response to changing environments) enabled Synechococcus sp. to develop a warming-adaptive transcriptional profile (downregulation of photosynthesis and CO₂ fixation) under OW. Nevertheless, the downregulation of photosynthesis and CO₂ fixation were alleviated under OW + MPs to increase responsiveness to the adverse effect. Due to the high abundances of Synechococcus sp. and its contributions to primary production, these findings are important for understanding the effects of MPs on carbon fixation and ocean carbon fluxes under global warming.

更新日期：2023-06-08

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