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Dose-Dependent Effects of a Corn Starch-Based Bioplastic on Basil (Ocimum basilicum L.): Implications for Growth, Biochemical Parameters, and Nutrient Content
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Researchers tested how a corn starch-based bioplastic affects basil plants when mixed into soil at various concentrations. Higher bioplastic levels reduced plant growth and caused oxidative stress, while also changing the plants' antioxidant activity and altering nutrient uptake patterns. While bioplastics are promoted as eco-friendly alternatives to conventional plastics, this study suggests they can still stress plants and affect food crop quality when they accumulate in agricultural soil.
Plastic pollution is a pressing global issue, prompting the exploration of sustainable alternatives such as bioplastics (BPs). In agriculture, BPs have gained relevance as mulching films. This study investigated the effect of the presence in the soil of different concentrations (0-3%, w/w) of a corn starch-based bioplastic on basil (Ocimum basilicum L.). The results showed that increasing bioplastic concentration reduced shoot fresh biomass production. Biochemical analyses revealed changes in the shoot in soluble protein content, biomarkers of oxidative and osmotic stress (malondialdehyde and proline, respectively), anti-radical activity, and antioxidant compounds (phenols, flavonoids, and ascorbic acid), which are indicative of plant adaptive mechanisms in response to stress caused by the presence of the different concentrations of bioplastic in the soil. Macro- and micronutrient analysis showed imbalances in nutrient uptake, with a decreased content of potassium, phosphorus, and manganese, and an increased content of magnesium, iron, and copper in the shoot at high BP concentrations.
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"Eco-friendly" bioplastics used in farming (like biodegradable mulch films) may not be as harmless as marketed: this study found that basil plants grown in soil containing bioplastic residue grew smaller, had less chlorophyll and vitamin C, and showed signs of cell stress compared to plants grown in normal soil. While this research looked at plant health rather than direct human effects, it raises questions about whether bioplastics breaking down in farm soil could affect crop quality and nutrition, suggesting that switching from conventional plastics to bioplastics isn't automatically a health or environmental win without more testing.
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Researchers tested whether wood distillate — a natural byproduct of wood processing — could counteract the growth-stunting effects of starch-based bioplastic on basil plants, finding that it partially restored plant health markers like vitamin C levels. The study highlights that even bioplastics can harm crops, and that natural plant treatments may help offset these effects in sustainable agriculture.
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