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Titanium Dioxide Nanoparticles Promote Root Growth by Interfering with Auxin Pathways in Arabidopsis thaliana

Jiali Wei*, Ying Zou, Ping Li, Xiaojun Yuan

Shanghai Key Laboratory of Bio-Energy Crops, Research Center for Natural Products, Plant Science Center, School of Life Sciences, Shanghai University, Shanghai 200444, China

* Corresponding Author: Jiali Wei. Email: email

Phyton-International Journal of Experimental Botany 2020, 89(4), 883-891. https://doi.org/10.32604/phyton.2020.010973

Abstract

TiO2 nanoparticles (nano-TiO2) are widely used in the world, and a considerable amount of nano-TiO2 is released into the environment, with toxic effects on organisms. In the various species of higher plants, growth, including seed germination, root elongation, and biomass accumulation, is affected by nano-TiO2. However, the underlying molecular mechanisms remain to be elucidated. In this study, we observed that nano-TiO2 promoted root elongation in a dose-dependent manner. Furthermore, we found that nano-TiO2 elevated auxin accumulation in the root tips of the auxin marker lines DII-VENUS and DR5:: GUS, and, correspondingly, quantitative real-time PCR analysis revealed that nano-TiO2 increased the expression levels of auxin biosynthesis- and transportrelated genes. GFP fluorescence observation using transgenic PIN2-GFP indicated that nano-TiO2 promoted root growth by inducing PIN2 accumulation. Thus, we propose that nano-TiO2 promote root growth in Arabidopsis thaliana by altering the expression levels of auxin biosynthesis- and transport-related genes.

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Wei, J., Zou, Y., Li, P., Yuan, X. (2020). Titanium Dioxide Nanoparticles Promote Root Growth by Interfering with Auxin Pathways in Arabidopsis thaliana. Phyton-International Journal of Experimental Botany, 89(4), 883–891.

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cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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