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Effect of microplastics on the allelopathic effects of native and invasive plants on co-occurring invaders
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Researchers found that polyethylene microplastics in soil enhanced the growth of both native and invasive plant species under competitive and non-competitive conditions. The microplastics also induced negative allelopathic effects from the native plant Achyranthes on neighboring plants, mediated through changes in leaf chemistry. The study suggests that microplastic pollution could alter competitive dynamics between native and invasive species by modifying plant chemical interactions.
The presence of PE microplastics enhanced the biomass of both Achyranthes and Amaranthus under competitive and non-competitive growth conditions. Furthermore, PE microplastics were found to induce a negative allelopathic effect for the native plant Achyranthes on co-occurring plants, which appeared to be mediated through changes in leaf chemistry. Bisdemethoxycurcumin, ethylparaben, salicin 6'-sulfate and 5-hydroxy-3',4',7-trimethoxyflavone glucoside were proven important compounds for allelopathic enhancement. Overall, these results suggest that microplastic pollution has the capability to influence the co-existence of invasive and native plants by altering their allelopathic potential. This insight into the interactions between microplastics and plant allelopathy provides a novel perspective on how microplastic pollution could modify plant species interactions and ecosystem dynamics. Future studies could aim to answer how microplastics might affect plant root exudates and whether this process would mediate biological invasion.
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This study examined how microplastics interact with invasive and native plant species in mixed plant communities, finding that microplastics altered competitive dynamics and affected the dominance of the invasive species Amaranthus palmeri. The results suggest that microplastic pollution could modulate the outcomes of plant invasions.
The more synthetic polymer types pollute the soil, the stronger the growth suppression of invasive alien and native plants
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This soil experiment found that the more types of synthetic microplastics polluting soil, the greater the suppression of plant growth — and this effect was especially pronounced for invasive plant species. The finding suggests that microplastic pollution could alter the competitive balance between invasive and native plants in contaminated soils.
Antagonistic Interaction Between Microplastics and Herbivory on the Growth of Native and Invasive Plants
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This study tested the individual and combined effects of polyethylene microplastics and herbivory on native and invasive plants, finding an antagonistic interaction where herbivore damage and MP stress partially offset each other's growth effects, with implications for invasive plant management.
Microplastics promote the invasiveness of invasive alien species under fluctuating water regime
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Researchers found that microplastic pollution in soil can enhance the invasiveness of alien plant species, particularly under fluctuating water conditions that simulate extreme rainfall events. The microplastics altered soil properties in ways that gave invasive plants a competitive advantage over native species. The study highlights a previously overlooked interaction between two major environmental threats: microplastic contamination and biological invasions.
The promoting effects of soil microplastics on alien plant invasion depend on microplastic shape and concentration
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A greenhouse experiment showed that soil microplastic pollution can help invasive plant species outcompete native plants. The invasive goldenrod grew better in soil contaminated with certain shapes and concentrations of polyethylene microplastics, while the native species was less affected. This suggests that microplastic pollution in soil could worsen the spread of invasive plants, with knock-on effects for ecosystems and agriculture.
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