Open Access
ARTICLE
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:
Phyton-International Journal of Experimental Botany 2020, 89(4), 883-891. https://doi.org/10.32604/phyton.2020.010973
Received 13 April 2020; Accepted 29 April 2020; Issue published 09 November 2020
Abstract
TiO
2 nanoparticles (nano-TiO
2) are widely used in the world, and a
considerable amount of nano-TiO
2 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-TiO
2. However, the underlying molecular mechanisms remain to be elucidated. In this study, we observed that nano-TiO
2 promoted root elongation in a
dose-dependent manner. Furthermore, we found that nano-TiO
2 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-TiO
2 increased the expression levels of auxin biosynthesis- and transportrelated genes. GFP fluorescence observation using transgenic
PIN2-GFP
indicated that nano-TiO
2 promoted root growth by inducing PIN2 accumulation.
Thus, we propose that nano-TiO
2 promote root growth in
Arabidopsis thaliana by
altering the expression levels of auxin biosynthesis- and transport-related genes.
Keywords
Cite This Article
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.
Citations