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Microplastics reduce nitrogen uptake in peanut plants by damaging root cells and impairing soil nitrogen cycling
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Researchers found that microplastics reduce nitrogen uptake in peanut plants by damaging root cells and impairing soil nitrogen cycling, with polypropylene and rubber crumb particles at high concentrations inhibiting plant growth and disrupting the soil-plant nitrogen system.
Microplastic (MP) pollution severely impairs the sustainable development of modern agriculture. However, the mechanisms underlying the effects of MP contaminants on nutrient cycles in agroecosystems are poorly understood. In this study, we examined the impacts of two types of MPs, polypropylene (PP) and rubber crumb (RC), on nitrogen (N) transformation and N cycling in soil-peanut system. High concentrations of PP (1% w/w) and RC (1% w/w) inhibited vegetative growth and N uptake in peanut plants by damaging root cells and disturbing soil N cycling. These MPs damaged the plasma membranes of root cells and caused oxidative stress, as evidenced by the decreased number of xylem vessels, which in turn inhibited N uptake by roots. Integrated metagenomic and metabolomic analyses revealed that the differential soil metabolite levels in response to MP treatment affected the microbial community structure in the rhizosphere and the expression of key N cycling-related genes, resulting in altered N transformation and the decreased availability of N in rhizosphere soil. These findings provide the first evidence of the effects of MPs on N uptake in peanut plants and shed light on the importance of rational management of MPs for crop growth and yield in agroecosystems.
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Inhibition of Peanut(Arachis hypogaea L.) Growth, Development,and Promotion of Root Nodulation IncludingPlant Nitrogen Uptake Triggered by Polyvinyl Chloride Microplastics
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Researchers investigated the impact of polyvinyl chloride (PVC) microplastics at concentrations of 0.5%, 1.5%, 2.5%, and 3.5% on peanut (Arachis hypogaea L.) growth, development, root nodulation, and nitrogen uptake. They found that PVC microplastics inhibited above-ground plant growth while promoting root nodule formation, indicating that soil microplastic contamination can disrupt plant physiology and nitrogen cycling in agricultural systems.
Inhibition of Peanut (Arachis hypogaea L.) Growth, Development, and Promotion of Root Nodulation Including Plant Nitrogen Uptake Triggered by Polyvinyl Chloride Microplastics
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Researchers investigated the impact of polyvinyl chloride (PVC) microplastics at four dosages (0.5%, 1.5%, 2.5%, and 3.5%) on the growth, development, root nodulation, and nitrogen uptake of peanut (Arachis hypogaea L.) plants. They found that PVC microplastics inhibited plant growth and development while paradoxically promoting root nodulation, suggesting complex soil-plant-microbiome interactions that could have implications for nitrogen cycling and food security in contaminated agricultural soils.
Polyvinyl chloride and polybutylene adipate microplastics affect peanut and rhizobium symbiosis by interfering with multiple metabolic pathways
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Researchers found that both PVC and biodegradable PBAT microplastics significantly disrupted the symbiotic relationship between peanut plants and nitrogen-fixing rhizobium bacteria. The microplastics reduced nodule formation by 33 to 100 percent and altered metabolic pathways involved in the symbiosis. The study suggests that microplastic contamination in agricultural soils could impair the natural nitrogen fixation process that legume crops depend on for healthy growth.
Polyethylene Microplastics Inhibit Peanut Nodulation via Metabolic and Transcriptional Pathways
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Scientists found that tiny plastic pieces from agricultural plastic films prevent peanut plants from forming healthy partnerships with beneficial soil bacteria that help them grow. These microplastics disrupt the plant's natural processes and block the formation of root nodules, which are essential for peanuts to get nitrogen from soil bacteria. This matters because it shows how plastic pollution in farmland could reduce crop yields and food production, potentially affecting our food supply.
Sub-micron microplastics affect nitrogen cycling by altering microbial abundance and activities in a soil-legume system
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Researchers found that very small (sub-micron) polyethylene and polypropylene microplastics in soil significantly altered nitrogen cycling by changing the abundance and activity of bacteria around soybean roots. While the microplastics did not affect plant growth directly, they increased nitrogen uptake and shifted the balance of nitrogen-processing bacteria. These hidden changes to soil chemistry could have long-term effects on agricultural productivity and the nutritional quality of crops.
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