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[Effect of Organic Fertilizers on the Accumulation and Distribution of Polystyrene Nanoplastics in Cotton Plants].
Summary
This pot experiment found that cotton plants absorb polystyrene nanoplastics through their roots and transport them into stems, but adding organic fertilizer reduced the amount transferred upward, with most nanoplastics retained in roots. While nanoplastics alone reduced plant growth indicators, organic fertilizer partially offset these negative effects. The results suggest that organic soil amendments could help reduce the uptake and spread of nanoplastics in food crops, which has implications for agricultural food safety.
In order to investigate whether the addition of organic fertilizers could reduce the uptake and accumulation of polystyrene nanoplastics （PS-NPs） in the roots and stalks of cotton plants， a pot experiment was conducted using different amounts of organic fertilizers （0 g·kg-1 and 10 g·kg-1） combined with a fixed amount of PS-NPs （100 mg·kg-1）. Fluorescently labeled PS-NPs with a particle size of 200 nm were used as tracers. The results demonstrated that cotton roots absorbed PS-NPs and transferred them to the stalks. Quantitative analysis revealed that most of the particles were retained in the roots under the treatment of nanoplastics + organic fertilizer （MOF1）， with the fluorescence intensity of PS-NPs transferred to the stalks accounting for only 60.08% of that in the roots. Compared to those in the blank control （CK）， the SPAD value， stem dry matter mass， and leaf dry matter mass of cotton plants in the nanoplastic-only （MOF0） treatment were significantly reduced by 6.94%， 37.29%， and 22.36%， respectively. In contrast， the leaf area in the MOF1 treatment increased significantly by 10.12%. Additionally， plant height， stem thickness， leaf area， SPAD value， root dry matter mass， and leaf dry matter mass in the MOF1 treatment were all significantly higher than those in the MOF0 treatment， increasing by 9.28%， 13.99%， 10.12%， 7.82%， 21.05%， and 21.47%， respectively. Furthermore， compared to those in the CK treatment， the activities of superoxide dismutase （SOD）， peroxidase （POD）， and catalase （CAT） in the roots of MOF0-treated plants were significantly elevated by 30.91%， 11.61%， and 40.00%， respectively， while malondialdehyde （MDA） mass molar concentration decreased by 12.24%. For MOF1-treated plants， the activities of SOD and CAT in the roots were significantly increased by 44.51% and 100%， respectively， and MDA mass molar concentration was reduced by 26.43%. In conclusion， organic fertilizer effectively reduced the accumulation of PS-NPs in cotton plant stalks by 43.78%. It also significantly mitigated the transfer of PS-NPs from roots to stalks， thereby reducing the overall accumulation of PS-NPs in cotton plants.