Abstract
This study was conducted to investigate the impact of supplementing blue and red light on the biomass yield, metal uptake, contaminant purification, and the alleviation of leaching risks by Noccaea caerulescens, a well-known hyperaccumulator of Cd and Zn. As previously reported for the closely related Thlaspi arvense, N. caerulescens retarded the leaching of Cd and Zn but aggravated the leaching of Pb and Cu, because the species mobilized all metals in soil but only extracted Cd and Zn. Monochromic red light reduced the leaching of Pb and Cu by 13.8% and 1.3%, respectively, but simultaneously weakened Cd phytoremediation by reducing shoot biomass. Our results demonstrated that a small proportion of blue light (10%) could eliminate the negative effect of monochromatic red light on plant shoot growth. However, root biomass decreased by 14.3%, 26.2%, 21.4%, and 61.9% as the percentage of blue light increased from 10 to 100%. Noccaea caerulescens generated the most biomass and accumulated the highest metal concentrations, except for Pb, when the ratio of red to blue light was 1:1. In addition, leachate volume was significantly reduced under the 10% and 50% blue light treatments compared to other light treatments. Therefore, light supplementation with a suitable proportion of blue light can enhance metal purification by N. caerulescens and alleviate potential leaching risk during phytoremediation.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request. All data generated or analyzed during this study are included in this published article.
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The authors thank the National Natural Science Foundation of China and the Ministry of Natural Resources of China Geological Survey (Project Nos. 21876014 and DD20230480) for financial support to carry out this study.
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HG involved in formal analysis and writing—original draft; XH involved in formal analysis and writing—review and editing; JZ involved in investigation and writing—original draft; LD involved in formal analysis and funding acquisition; CH involved in writing—review and editing; JL involved in conceptualization, methodology, validation, writing—review and editing, supervision, and funding acquisition.
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Gong, H., Hu, X., Zhang, J. et al. Effect of red and blue light supplementation on the efficacy of Noccaea caerulescens in decontaminating metals and alleviating leaching risk. Environ Geochem Health 46, 48 (2024). https://doi.org/10.1007/s10653-023-01837-9
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DOI: https://doi.org/10.1007/s10653-023-01837-9