@Article{phyton.2020.010973,
AUTHOR = {Jiali Wei, Ying Zou, Ping Li, Xiaojun Yuan},
TITLE = {Titanium Dioxide Nanoparticles Promote Root Growth by Interfering with Auxin Pathways in <i>Arabidopsis thaliana</i>},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {89},
YEAR = {2020},
NUMBER = {4},
PAGES = {883--891},
URL = {http://www.techscience.com/phyton/v89n4/40533},
ISSN = {1851-5657},
ABSTRACT = {TiO<sub>2</sub> nanoparticles (nano-TiO<sub>2</sub>) are widely used in the world, and a
considerable amount of nano-TiO<sub>2</sub> 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<sub>2</sub>. However, the underlying molecular mechanisms remain to be elucidated. In this study, we observed that nano-TiO<sub>2</sub> promoted root elongation in a
dose-dependent manner. Furthermore, we found that nano-TiO<sub>2</sub> elevated auxin
accumulation in the root tips of the auxin marker lines <i>DII-VENUS</i> and <i>DR5::
GUS</i>, and, correspondingly, quantitative real-time PCR analysis revealed that
nano-TiO<sub>2</sub> increased the expression levels of auxin biosynthesis- and transportrelated genes. GFP fluorescence observation using transgenic <i>PIN2-GFP</i>
indicated that nano-TiO<sub>2</sub> promoted root growth by inducing PIN2 accumulation.
Thus, we propose that nano-TiO<sub>2</sub> promote root growth in <i>Arabidopsis thaliana</i> by
altering the expression levels of auxin biosynthesis- and transport-related genes.},
DOI = {10.32604/phyton.2020.010973}
}