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Effects of Microplastics on Growth and Physiological Characteristics of Tobacco (Nicotiana tabacum L.)
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Researchers found that low-density polyethylene microplastics inhibited tobacco plant growth in hydroponics, with high concentrations (1,000 mg/L) reducing chlorophyll content, disrupting antioxidant defenses, and lowering overall biomass.
The environmental effects caused by the proliferation of microplastics have received extensive attention. However, at this stage, there is a lack of research on the toxicology of microplastics and their impacts on plants. This study explored the effects of microplastics on the growth and physiological characteristics of tobacco. Using tobacco (Nicotiana tabacum L.) variety Yunyan87 and low-density polyethylene (LDPE, 13 μm particle size), different concentrations, which were 0 mg/L (CK), 10 mg/L (T1), 100 mg/L (T2), and 1000 mg/L (T3), were subjected to hydroponic experiments to study the effects of microplastics on the growth and physiological characteristics of tobacco. The results showed that microplastics had a certain inhibitory effect on the growth of tobacco. Among them, high concentrations of microplastics significantly inhibited the root architecture and growth characteristics. According to the performance observed with different treatments, the content of malondialdehyde (MDA) and the activity of superoxide dismutase (SOD) increased in the medium and high concentrations. In addition, the changes in catalase (CAT) and peroxidase (POD) activity were not obvious. Experiments showed that microplastics could significantly inhibit the growth and development of tobacco and reduce the accumulation of aerial parts and root biomass.
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A pot experiment found that soil microplastic pollution at realistic environmental concentrations inhibited tobacco plant growth, reducing biomass and altering leaf physiology, with effects varying by microplastic type and concentration.
Unraveling the impact of nano-microscale polyethylene and polypropylene plastics on Nicotiana tabacum: Physiological responses and molecular mechanisms
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Researchers exposed tobacco plants to polyethylene and polypropylene microplastics of different sizes and found that both types suppressed plant growth in a dose-dependent manner, with polypropylene being more toxic. The microplastics disrupted photosynthesis, triggered oxidative stress, and altered hormone signaling and defense pathways in the plants. These findings demonstrate that microplastic contamination in soil can impair crop growth at the molecular level, potentially affecting agricultural productivity.
Analysis of Agronomic Traits and Physiological and Biochemical Responses of Tobacco under Polyethylene Microplastics in Situ Stress
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Researchers conducted in-situ field experiments across four tobacco-growing regions in China and found that polyethylene microplastics of varying particle sizes altered tobacco agronomic traits and physiological and biochemical characteristics, providing evidence for ecological risk in farmland microplastic pollution.
The phytotoxicity of microplastics to the photosynthetic performance and transcriptome profiling of Nicotiana tabacum seedlings
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Researchers grew tobacco seedlings in soil contaminated with polyethylene microplastics and found significant damage to their photosynthetic systems, including reduced chlorophyll content and impaired light-use efficiency. Gene analysis revealed that thousands of genes were affected, with 79 key genes related to photosynthesis being suppressed. The study provides new molecular-level evidence that soil microplastic pollution can directly harm how plants convert sunlight into energy.
[Effects of Low-density Polyethylene Microplastics on the Growth and Physiology Characteristics of Ipomoea aquatica Forsk].
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