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Effects of nanoplastics on the growth, transcription, and metabolism of rice (Oryza sativa L.) and synergistic effects in the presence of iron plaque and humic acid

Environmental Pollution 2024 9 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Yongtao Li Xiaoxue Ouyang, Xiaoxue Ouyang, Xiaoxue Ouyang, Xiaoxue Ouyang, Xiaoxue Ouyang, Xiaoxue Ouyang, Jie Ma, Jie Ma, Jie Ma, Jie Ma, Jie Ma, Xiaoxue Ouyang, Bingcong Feng, Bingcong Feng, Bingcong Feng, Bingcong Feng, Bingcong Feng, Bingcong Feng, Xiaoxue Ouyang, Bingcong Feng, Bingcong Feng, Bingcong Feng, Bingcong Feng, Xiaoxue Ouyang, Xiaoxue Ouyang, Xiaoxue Ouyang, Xiaoxue Ouyang, Yong Liu, Liping Weng, Yong Liu, Liping Weng, Yong Liu, Yongtao Li Ping Yin, Jie Ma, Ping Yin, Xiaoxue Ouyang, Xiaoyu Zhang, Bingcong Feng, Xiaoxue Ouyang, Bingcong Feng, Li Pan, Xiaoyu Zhang, Liping Weng, Liping Weng, Liping Weng, Xiaoyu Zhang, Jie Ma, Liping Weng, Qiusheng Chen, Li Pan, Li Pan, Qiusheng Chen, Yongtao Li Yongtao Li Yongtao Li Yongtao Li Liping Weng, Yongtao Li Yong Liu, Yongtao Li Qiusheng Chen, Qiusheng Chen, Qiusheng Chen, Qiusheng Chen, Yujie Zhao, Liping Weng, Yongtao Li Yongtao Li Liping Weng, Yongtao Li Yongtao Li Yongtao Li Yujie Zhao, Yujie Zhao, Yongtao Li Yongtao Li Liping Weng, Liping Weng, Yongtao Li Yongtao Li Liping Weng, Liping Weng, Yongtao Li Yongtao Li Yongtao Li Yongtao Li Yongtao Li Yongtao Li

Summary

This study examined how nanoplastics affect rice plant growth, finding that the tiny particles were absorbed by roots and entered plant cells. Nanoplastic exposure reduced important enzyme activity and protein levels in roots, disrupting normal plant metabolism. The presence of iron plaque and humic acid in the soil changed how much nanoplastic the plants took up, suggesting that real-world soil conditions play a key role in how crops are affected.

Polymers

Nanoplastics (NPs) can adversely affect living organisms. However, the uptake of NPs by plants and the physiological and molecular mechanisms underlying NP-mediated plant growth remain unclear, particularly in the presence of iron minerals and humic acid (HA). In this study, we investigated NP accumulation in rice (Oryza sativa L.) and the physiological effects of exposure to polystyrene NPs (0, 20, and 100 mg L) in the presence of iron plaque (IP) and HA. NPs were absorbed on the root surface and entered cells, and confocal laser scanning microscopy confirmed NP uptake by the roots. NP treatments decreased root superoxide dismutase (SOD) activity (28.9-44.0%) and protein contents (31.2-38.6%). IP and HA (5 and 20 mg L) decreased the root protein content (20.44-58.3% and 44.2-45.2%, respectively) and increased the root lignin content (22.3-27.5% and 19.2-29.6%, respectively) under NP stress. IP inhibited the NP-induced decreasing trend of SOD activity (19.2-29.5%), while HA promoted this trend (48.7-50.3%). Transcriptomic and metabolomic analysis (Control, 100NPs, and IP-100NPs-20HA) showed that NPs inhibited arginine biosynthesis, and alanine, aspartate, and glutamate metabolism and activated phenylpropanoid biosynthesis related to lignin. The coexistence of IP and HA had positive effects on the amino acid metabolism and phenylpropanoid biosynthesis induced by NPs. Regulation of genes and metabolites involved in nitrogen metabolism and secondary metabolism significantly altered the levels of protein and lignin in rice roots. These findings provide a scientific basis for understanding the environmental risk of NPs under real environmental conditions.

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