Titanium Dioxide Nanoparticles Promote Root Growth by Interfering with Auxin Pathways in <i>Arabidopsis thaliana</i> |
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Authors: | Jiali Wei Ying Zou Ping Li Xiaojun Yuan |
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Institution: | Shanghai Key Laboratory of Bio-Energy Crops, Research Center for Natural Products, Plant Science Center, School of Life Sciences, Shanghai University, Shanghai 200444, China |
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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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Keywords: | Nanoparticles nano-TiO2" target="_blank">2" target="_blank">nano-TiO2 root length auxin PIN2 auxin-related genes |
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