Abstract
Thallium (Tl) is a highly toxic element with two species, Tl(I) and Tl(III). We discovered the Tl uptake in rice exposed to Tl(III) hydroponic treatment was significantly lower than that to Tl(I) treatment, but the content of oxalic acid secreted from roots in Tl(III) treatment was higher than that in Tl(I). The physiological and molecular mechanisms underlying the difference between the two Tl species were studied using a hydroponic system. The results showed the reduction of oxalic acid content had no effect on the amount of Tl on the root surface, indicating oxalic acid might not immobilize Tl to affect the Tl uptake. Therefore, the secretion of oxalic acid from roots may not be a strategy for detoxifying Tl in rice. Notably, Tl(III) increased the expression of Oryza sativa H+-ATPase genes OsAs and the activity of H+-ATPase, and decreased potassium transport gene expression of OsKAT1.1 and OsHKT2;4, which indicated that the difference in Tl uptake of rice between the two Tl species mainly cause by the potassium transport system rather than oxalic acid.
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Acknowledgements
This work was supported by Guangdong Provincial Key Research Program of Universities (2019KZDXM054), Rural Revitalization Strategy Project of Guangdong Province (620096-3), Guangdong Basic and Applied Basic Research Foundation (2020A1515011440), Guangzhou Science and Technology Project (202102010452; 202102010385) and Guangdong Water Conservancy Science and Technology Innovation Project (2020-33). Dr. Hui Liu (The University of Western Australia, Australia) is thanked for providing language help.
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Yao, Y., Yang, R., Liao, W. et al. Is Oxalic Acid Secretion A Detoxification Strategy for Rice Exposed to Tl(I) or Tl(III)?. Bull Environ Contam Toxicol 109, 920–926 (2022). https://doi.org/10.1007/s00128-022-03613-4
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DOI: https://doi.org/10.1007/s00128-022-03613-4