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Biodegradable microplastics induce profound changes in lettuce (Lactuca sativa) defense mechanisms and to some extent deteriorate growth traits
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Researchers tested the effects of biodegradable plastic microplastics on lettuce growth and found that while the plants still grew, the microplastics caused significant stress at the cellular level. The plastic particles reduced chlorophyll content, triggered oxidative stress, and forced plants to activate their defense mechanisms, which affected their weight and nutrient content. This challenges the assumption that biodegradable plastics are harmless to crops and raises questions about food quality from microplastic-contaminated soil.
The development of agricultural technologies has intensified the use of plastic in this sector. Products of plastic degradation, such as microplastics (MPs), potentially threaten living organisms, biodiversity and agricultural ecosystem functioning. Thus, biodegradable plastic materials have been introduced to agriculture. However, the effects of biodegradable plastic substitutes on soil ecosystems are even less known than those of traditional ones. Here, we studied the effects of environmentally relevant concentrations of MPs prepared from a biodegradable plastic (a starch-polybutylene adipate terephthalate blend, PBAT-BD-MPs) on the growth and defense mechanisms of lettuce (Lactuca sativa) in CLIMECS system (CLImatic Manipulation of ECosystem Samples). PBAT-BD-MPs in the highest concentrations negatively affected some traits of growth, i.e., dry weight percentage, specific leaf area, and both C and N contents. We observed more profound changes in plant physiology and biochemistry, as PBAT-BD-MPs decreased chlorophyll content and triggered a concerted response of plant defense mechanisms against oxidative stress. In conclusion, exposure to PBAT-BD-MPs induced plant oxidative stress and activated plant defense mechanisms, leading to oxidative homeostasis that sustained plant growth and functioning. Our study highlights the need for in-depth understanding of the effect of bioplastics on plants.
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Effects of Biodegradable Microplastics on Soil and Lettuce Health: Rhizosphere Microbiome and Metabolome Responses
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Researchers tested how two common biodegradable microplastics affect lettuce growth and the microbial communities around its roots. At higher concentrations, both types of biodegradable plastics inhibited lettuce growth and significantly disrupted the balance of beneficial soil microbes and plant metabolic processes. The findings suggest that even plastics marketed as biodegradable can negatively impact soil health and crop development when present in sufficient quantities.
Responses of lettuce (Lactuca sativa L.) growth and soil properties to conventional non-biodegradable and new biodegradable microplastics
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Scientists compared the effects of biodegradable and conventional polyethylene microplastics on lettuce growth and soil health. Both types of microplastics reduced plant growth, damaged photosynthesis, and altered soil nutrient levels, but biodegradable PBAT microplastics actually caused more disruption to soil microbial communities. The findings challenge the assumption that biodegradable plastics are necessarily safer for agricultural ecosystems.
Studies on the impact of aged microplastics on agricultural soil enzyme activity, lettuce growth, and oxidative stress
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This study examined how aged microplastics from three common plastics (polystyrene, polyethylene, and polylactic acid) affect soil health and lettuce growth. Researchers found that high concentrations of biodegradable PLA plastic actually reduced lettuce weight by over 58%, while all three plastic types triggered oxidative stress in the plants. The results show that even so-called eco-friendly biodegradable plastics can harm crops and soil when they accumulate at higher levels.
Transcriptomic and metabolomic changes in lettuce triggered by microplastics-stress
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Researchers grew lettuce in water containing polystyrene microplastics and found that the particles accumulated in root tips and leaf veins, causing water loss stress and changes in gene expression. The plants responded by activating stress defense systems and altering their metabolism, including increased production of protective compounds in root secretions. This study provides molecular-level evidence that microplastics can stress food crops and change their biology, raising questions about the safety and nutritional quality of vegetables grown in contaminated environments.
Differential physiological and biochemical responses of lettuce cultivars to polyethylene microplastic stress
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Scientists exposed two types of lettuce to microplastic-contaminated soil and found that different lettuce varieties react differently, activating their own internal antioxidant defenses to cope with the stress. This matters because microplastics are already widespread in farm soils, and understanding how crops respond could help researchers breed more resilient produce, though this study looked at plant stress responses, not yet whether eating the lettuce itself poses risks to people.
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