Warming and microplastic pollution shape the carbon and nitrogen cycles of algae

Hou, Xuan; Hu, Xiangang; Guo, Shuqing

doi:10.1016/j.jhazmat.2023.130775

Cited by 20 publications

(3 citation statements)

References 71 publications

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“…The downregulation of HSP gene expression induced by MPs under heat stress was also found in the diatom Chaetoceros gracilis (C. gracilis) . These results indicated that the thermal protection of phytoplankton could be weakened by MPs under heat stress.…”

Section: Resultsmentioning

confidence: 68%

“…MPs induce light shading or heteroaggregation formation on phytoplankton, which prevent phytoplankton from absorbing light energy and thereby directly affect the photosynthetic rate and nutrient assimilation, ultimately eventuating in inhibited growth and primary productivity of phytoplankton. − In addition, leachate (organic pollutants or heavy metals) leaching from plastic in aqueous media can also affect growth and photosynthesis of phytoplankton − and even pose a higher impact on phytoplankton than MPs . Phytoplankton can respond to changing environments through phenotypic plasticity or genetic changes to produce different phenotypes in response to environmental stressors and mitigate adverse effects. − Although factorial assessments of phytoplankton sensitivities to heat stress and MPs have increased rapidly, studies on the combined effects of OW + MPs on phytoplankton are rare, − especially in terms of long-term acclimation . It is important to examine the impacts on phytoplankton when MP pollution occurs in combination with the environmental stressor OW.…”

Section: Introductionmentioning

confidence: 99%

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

Zeng

Ouyang

et al. 2023

Environ. Sci. Technol.

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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.

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Section: Resultsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

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

Zeng

Ouyang

et al. 2023

Environ. Sci. Technol.

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“…Moreover, two genes encoding the heat shock proteins 70 (hsp70, hsp70-5) were upregulated 2 2.75 -and 2 3.81 -folds, respectively. Heat shock proteins also act as antioxidants that could be stimulated in microalgal cells in response to high temperature, heavy metals and peroxide stress [30][31][32]. The proteasome pathway was significantly enriched in the KEGG analysis, and the related DEGs mainly included psmd (2,3,12), rpt4a encoding regulatory elements, psma (6,7) and psmb (1,3,5,6) encoding core elements, which were all significantly up-regulated under the NPs exposure (Figure 5 and Table S3).…”

Section: Antioxidant Defense System and Proteasome Pathway Of A Tamar...mentioning

confidence: 97%

The Effecting Mechanisms of 100 nm Sized Polystyrene Nanoplastics on the Typical Coastal Alexandrium tamarense

Li,

Liu,

et al. 2024

IJMS

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Due to the increase in nanoplastics (NPs) abundance in aquatic environments, their effects on phytoplankton have aroused large research attention. In this study, 100 nm sized polystyrene NPs were chosen to investigate their effecting performance and mechanisms on a typical dinoflagellates Alexandrium tamarense. The results indicated the population growth and photosynthetic efficiencies of A. tamarense were significantly inhibited by NPs exposure, as well as the increase in cellular total carotenoids and paralytic shellfish toxins (PSTs). Meanwhile, the cellar ROS levels increased, corresponding to the increased activities or contents of multiple antioxidant components, including SOD, CAT, GPX, GR, GSH and GSSG. The transcriptional results support the physiological–biochemical results and further revealed the down-regulation of genes encoding the light reaction centers (PSI and PSII) and up-regulation of genes encoding the antioxidant components. Up-regulation of genes encoding key enzymes of the Calvin cycle and glycolytic pathway together with the TCA cycle could accelerate organic carbon and ATP production for A. tamarense cells resistant to NPs stress. Finally, more Glu and acetyl-CoA produced by the enhanced GSH cycle and the glycolytic pathway, respectively, accompanied by the up-regulation of Glu and Arg biosynthesis genes supported the increase in the PST contents under NPs exposure. This study established a data set involving physiological–biochemical changes and gene information about marine dinoflagellates responding to NPs, providing a data basis for further evaluating the ecological risk of NPs in marine environments.

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Role of Microplastics in Global Warming and Climate Change: A Review

Parvez,

Ullah,

Faruk

et al. 2024

Water Air Soil Pollut

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Microplastics (MPs) have become an important concern among scientists and policymakers all around the globe. Despite this, the contribution of MPs to global warming and climate change, a significant aspect of the issue, has been overlooked. Continuous greenhouse gas (GHG) emissions resulting in climate change have long been a major issue with apparent consequences. Climate change and plastic crises are threatening our planet, and the co-occurrence of both would be catastrophic. This article addressed the links between microplastic pollution and climate change; how MPs contribute to climate change by interacting with water, air, and soil; and recommendations to address the issues together. Throughout their lives, plastics emit GHG. MPs in water impede the climate change mitigation potential of the ocean in different ways; they hamper photosynthesis and carbon sequestration by phytoplankton and the Blue Carbon Ecosystem. MPs induce GHG emissions from the soil. Airborne MPs have the potential to aid in cloud formation and interfere with atmospheric cooling. Climate change–induced extreme events redistribute MPs in the environment, causing the pollution to increase vertically and horizontally, which then aggravates the situation in a feedback loop. The evidence acquired in the study implies that MPs and climate change are inextricably linked and that MPs play a vital role in fueling climate change. This bridges the gap between MPs and climate change issues that were previously regarded separately. Due to the linkages between these intertwined challenges, integrated and holistic research and policy measures are required to address both crises concurrently.

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Warming and microplastic pollution shape the carbon and nitrogen cycles of algae

Cited by 20 publications

References 71 publications

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

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

The Effecting Mechanisms of 100 nm Sized Polystyrene Nanoplastics on the Typical Coastal Alexandrium tamarense

Role of Microplastics in Global Warming and Climate Change: A Review

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