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Biochemical Impact of Microplastic Exposure on Seed Enzyme Activation During Early Germination
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This study examined how microplastic exposure affects antioxidant enzyme activity in seeds during early germination, finding that microplastics disrupted key biochemical processes required for seed activation. The results suggest soil microplastic contamination could impair crop establishment.
Microplastics (MPs) constitute a pervasive environmental contaminant with demonstrable phytotoxic effects. This review synthesizes cutting-edge research (up to 2025) elucidating the specific biochemical mechanisms by which MPs disrupt critical enzymatic pathways during the highly vulnerable early germination phase (imbibition to radicle emergence). We detail how MPs, through physical interference, chemical leachates, and induction of oxidative stress, directly modulate the activity, structure, and expression of key enzymes governing metabolic reactivation (α-amylase, proteases, lipases), energy production (glycolytic enzymes, G6PDH), ROS homeostasis (SOD, CAT, APX, POD), and cell wall remodeling (expansins, XTHs). Advanced methodologies (proteomics, real-time activity monitoring, spatiotemporal mapping) reveal significant alterations in enzyme kinetics (Km, Vmax), post-translational modifications, and subcellular localization. These disruptions impair reserve mobilization, energy metabolism, antioxidant capacity, and radicle emergence, directly linking MP exposure to reduced germination percentage, rate, and seedling vigor. This work establishes MPs as potent biochemical disruptors at the seed level, with profound implications for plant establishment, agricultural productivity, and ecosystem resilience.
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Researchers tested how different concentrations of polystyrene microplastics affect rice seed germination, root growth, and antioxidant enzyme activity. They found that at higher concentrations, the microplastics inhibited root growth and triggered oxidative stress responses in the seedlings. The study indicates that microplastic contamination in agricultural soils could interfere with early crop development, potentially affecting food production.
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This study examined the effects of microplastic contamination on lettuce seed germination, finding that microplastics in soil altered physiological processes such as water retention and chlorophyll production, with implications for food safety and agricultural ecosystems.
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This review summarizes how various soil pollutants including microplastics, heavy metals, and petroleum chemicals inhibit crop seed germination and early growth. Microplastics can physically block water absorption by seeds and release toxic additives that impair root development. The findings are relevant to food security because microplastic contamination of agricultural soil could reduce crop yields and affect the food supply.
Response of soil biochemical properties and ecosystem function to microplastics pollution
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This study found that polyethylene microplastics significantly disrupted soil health by reducing enzyme activity, lowering nutrient availability, and impairing overall ecosystem function. Smaller microplastics caused more damage than larger ones, and the effects were dose-dependent, suggesting that as microplastic pollution accumulates in agricultural soil, it could increasingly threaten the soil health that food production depends on.
Assessing Microplastic Contamination Effects on Soil Microbial Communities in Agricultural Land
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This study sampled agricultural soils with varying degrees of microplastic contamination to assess effects on microbial diversity, abundance, and enzymatic activity, finding that higher microplastic concentrations reduced microbial diversity and suppressed nutrient-cycling enzyme activity.
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