ORIGINAL RESEARCH
Combined Phytotoxicity of Microplastics and
Lead on the Growth and Physio-Biochemical
Characteristics of Tobacco (Nicotiana tabacum)
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1
Institute of Tobacco Research, Chinese Academy of Agricultural Sciences (CAAS), Qing’dao, Shandong, China
2
Honghe Branch Office, Yunnan Prefecture Tobacco Company, Mi’le, Yunnan, China
3
College of Life Sciences, Dezhou University, De’zhou, Shandong, China
4
China Tobacco Jiangxi Industrial Co., Ltd, Nan’Chang, Jiangxi, China
Submission date: 2024-11-25
Final revision date: 2025-04-17
Acceptance date: 2025-06-02
Online publication date: 2025-09-25
Corresponding author
Jian Huang
China Tobacco Jiangxi Industrial Co., Ltd, Nan’Chang, Jiangxi, China
Lin Meng
Institute of Tobacco Research, Chinese Academy of Agricultural Sciences (CAAS), Qing’dao, Shandong, China
KEYWORDS
TOPICS
ABSTRACT
Microplastic and heavy metal contaminants have attracted global concern due to their ubiquitous
presence and long-lasting persistence, yet little is known about their interactions on plant growth
performance. Here, different concentrations of polyethylene (PE)-microplastics (MPs) and lead (Pb)
were applied to soils to investigate their impacts on tobacco plants. Our results showed that tobacco
plants grown in PE-MP- and Pb-contaminated soils displayed a significant reduction in leaf pigment
content, photosynthetic efficiency, and plant biomass, as well as a remarkable increase in the contents
of hydrogen peroxide, superoxide ions, and malondialdehyde. The Pb contents in plant roots decreased
from 886 mg kg-1 t o 7 65 mg kg-1 with increasing concentrations of PE-MPs, while the leaf Pb
concentrations remained unaffected. The impaired photosynthetic performance in tobacco leaves was
attributed to Pb stress, causing stomatal closure and PE-MP-induced nonstomatal limitation. Moreover,
the coexistence of PE-MPs and Pb damaged the PSII reaction center, disturbed the electron transport
process, and reduced photosynthetic efficiency. To alleviate oxidative damage, the contents of proline
and soluble sugar, along with the antioxidant enzyme activities, underwent a significant increase in
tobacco plants. This work offers valuable insights for addressing the challenges posed by the emergence
of contaminants in agricultural production.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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