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The toxicological effect on pak choi of co-exposure to degradable and non-degradable microplastics with oxytetracycline in the soil
Summary
This study tested how microplastics and the antibiotic oxytetracycline, both common contaminants in farmland soil, affect pak choi (a leafy vegetable). Both types of microplastics harmed root growth, photosynthesis, and plant metabolism, and surprisingly, biodegradable PLA microplastics caused more damage than conventional polyethylene ones. The findings suggest that microplastic contamination in agricultural soil could reduce crop quality and nutritional value, with so-called eco-friendly plastics potentially being worse for plants.
Microplastics and antibiotics are emerging as ubiquitous contaminants in farmland soil, harming crop quality and yield, and thus threatening global food security and human health. However, few studies have examined the individual and joint effects of degradable and/or non-degradable microplastics and antibiotics on crop plants. This study examined the individual and joint effects of polyethylene (PE) and polylactic acid (PLA) microplastics and the antibiotic oxytetracycline (OTC) on pak choi by measuring its growth, photosynthesis, antioxidant enzyme activity, and metabolite levels. Microplastics and/or oxytetracycline adversely affected root weight, photosynthesis, and antioxidant enzyme (superoxide dismutase, catalase, and ascorbate peroxidase) activities. The levels of leaf metabolites were significantly altered, causing physiological changes. Biosynthesis of plant secondary metabolites and amino acids was altered, and plant hormones pathways were disrupted. Separately and together, OTC, PE, and PLA exerted phytotoxic and antagonistic effects on pak choi. Separately and together with OTC, degradable microplastics altered the soil properties, thus causing more severe impacts on plant performance than non-degradable microplastics. This study elucidates the effects on crop plants of toxicity caused by co-exposure to degradable or non-degradable microplastic and antibiotics contamination and suggests mechanisms.