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Soil fungal diversity and plant resilience under the dual stress of microplastics and heavy metals: A comparative study of lettuce and green onion
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Tiny plastic particles (microplastics) combined with heavy metals in soil can harm the beneficial fungi that help plants grow, while also boosting harmful plant pathogens — and the smaller the plastic pieces, the worse the damage. This mattered most for lettuce grown directly from seed, which absorbed more contamination and showed more stress than green onions grown from seedlings, suggesting the vegetables you buy could carry these pollutants depending on how they were farmed. While this study looked at soil and plant health rather than direct human effects, it raises concerns since these contaminants could potentially make their way into the produce we e
Microplastics are major environmental contaminants due to their persistence and durability. However, research on the combined effects of heavy metals (HMs) and MPs on soil fungi and plant health remains limited. This study investigates the HMs contaminated soils in Tongling, along with polystyrene microplastics (PS-MP) of different sizes (T1 = 106 μm, T2 = 50 μm, and T3 = 13 μm), on soil properties, fungal diversity (including AMF and pathogens), and the growth/ antioxidant activity of Allium fistulosum and Lactuca sativa under two planting methods. Results showed that MP size significantly influenced fungal composition and plant growth, with planting procedure and exposure time playing key roles. PS-MPs increased soil pH, TC, EC, SOM, Cd, and TP while reducing nitrogen, ammonia, and nitrate levels. Alpha diversity declined in rhizosphere soil and Lactuca sativa with the Chao1 index, for example, decreasing by approximately 22% under the smallest MPs treatment in lettuce rhizosphere (T3R) compared to its bulk soil control (LCB). The phylum Blastocladiomycota was absent in T3-treated lettuce. Rhizosphere soils with smaller PS-MPs had a higher concentration of plant pathogens, particularly in lettuce. AMF were more abundant in bulk soil; smaller MPs reduced their abundance, especially in lettuce. Claroideoglomeraceae family was absent in lettuce but present in onion, while the Glomeraceae was highly sensitive to smaller MPs in rhizosphere soil. Growth parameters, membrane leakage, relative water content, and antioxidant activity were significantly affected, especially under T3 conditions. The combination of PS-MPs and HMs had a more severe impact on Lactuca sativa (seeds) than on Allium fistulosum (seedlings). Planting method critically influenced plant resilience and fungal community. Our results highlight the heightened ecological risks associated with small PS-MPs containing HMs, particularly for direct-seeded plants.
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Micro plastic driving changes in the soil microbes and lettuce growth under the influence of heavy metals contaminated soil
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Researchers studied how microplastics interact with heavy metals in contaminated soil and their combined effects on lettuce growth and soil bacteria. Different types of microplastics altered soil chemistry and changed which microbes thrived, sometimes making heavy metals more available to plants. The study suggests that microplastic-contaminated agricultural soil could affect both the safety and nutritional quality of leafy vegetables that people eat.
Microplastic-Mediated Heavy Metal Uptake in Lettuce (Lactuca sativa L.): Implications for Food Safety and Agricultural Sustainability
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Researchers grew lettuce in contaminated soil mixed with different types of microplastics, including fibers, glitter, and fragments from bags and bottles. They found that microplastics altered how heavy metals like lead, cadmium, and copper moved through the soil and into the plants, sometimes increasing uptake of toxic metals in roots while decreasing others in leaves. The results raise concerns about food safety in agricultural areas where both microplastic and heavy metal contamination overlap.
Effects of naturally aged microplastics on arsenic and cadmium accumulation in lettuce: Insights into rhizosphere microecology
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Researchers studied how naturally aged microplastics in soil affect the uptake of arsenic and cadmium by lettuce. At low concentrations, microplastics actually reduced heavy metal absorption and helped plant growth, but at higher concentrations they increased the amount of toxic metals taken up by the lettuce. This means microplastic-contaminated farmland could lead to higher levels of heavy metals in salad greens and other vegetables that people eat.
Assessment of physiological stress on plants grown in soil contaminated with microplastics
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Researchers tested how three types of microplastics (PET, HDPE, and polyester) affect the growth and health of spring onion and okra plants. They found that all microplastic types reduced chlorophyll levels, increased oxidative stress, and stunted plant growth, with HDPE and polyester causing the most damage. The study highlights the potential ecological risks microplastics pose to vegetable crops grown in contaminated soil.
Synergistic fungal consortia enhance maize growth and soil biological functions under microplastic stress
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Tiny plastic particles from packaging waste (microplastics) are building up in farm soil, and this study found they stunt corn plant growth, damage roots, and throw off the soil's natural balance—raising concerns about crop yields and food supply. The good news: researchers found that adding a combo of two beneficial fungi to the soil helped plants fight off this plastic-related stress, offering a natural, low-tech way to protect crops as microplastic pollution spreads through farmland. While this study focused on corn plants rather than direct human health effects, it points to a promising tool for keeping our food supply resilient in an increasingly plast
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