Abstract
Paddy rice is a typical wetland plant species, and mercury (Hg) accumulation in this rice has received much attention over the last two decades. The role of root iron plaque on rice Hg accumulation is not well understood. The effects of iron plaque on Hg0 uptake, translocation, and volatilization in rice seedlings were investigated under hydroponic conditions using different rice genotypes. After induction of iron plaque on rice roots with pretreatment solutions containing 0, 15 and 30 mg Fe2+L−1, rice seedlings were transplanted into specially designed airtight culture chambers, where roots were separated from the aerial parts and exposed to saturated Hg0 vapor. The results showed the following: (1) There were significant differences in the amount of iron plaque formed on the rice roots among the three genotypes. (2) A significant correlation was observed between the concentrations of Hg and Fe in the iron plaque of the root surface for the three genotypes (R2 = 0.933, p < 0.01). (3) Iron plaque may act as a barrier for Hg0 behavior, i.e., inhibiting the process of Hg0 uptake and translocation from the rhizosphere.
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Acknowledgements
This research was supported by Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration (SHUES2021C02) and the Fundamental Research Funds for the Central Universities and was funded by Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area, Ministry of Natural Resources. We would also like to thank the National Natural Science Foundation of China (31400445) for supporting this study.
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All authors contributed to the study. Experimental design and chemical analysis were performed by SS, and data processing was performed by XL, SC, and RL. The first draft of the manuscript was written by YW. WJ was responsible for data processing, content editing and language polishing of the revised manuscript. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Wang, Y., Shang, S., Li, X. et al. Effect of Iron Plaque on Gaseous Elemental Mercury Uptake, Translocation, and Volatilization by Paddy Rice. Bull Environ Contam Toxicol 109, 1155–1161 (2022). https://doi.org/10.1007/s00128-022-03617-0
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DOI: https://doi.org/10.1007/s00128-022-03617-0