Exposure of Iron Nanoparticles to Arabidopsis thaliana Enhances Root Elongation by Triggering Cell Wall Loosening
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SCOPUS
- Title
- Exposure of Iron Nanoparticles to Arabidopsis thaliana Enhances Root Elongation by Triggering Cell Wall Loosening
- Authors
- Kim, JH; Lee, Y; Kim, EJ; Gu, S; Sohn, EJ; Seo, YS; An, HJ; Chang, YS
- Date Issued
- 2014-03-18
- Publisher
- AMER CHEMICAL SOC
- Abstract
- In this study, we investigated the effect of nZVI on plant root elongation in Arabidopsis thaliana and showed, for the first time, that nZVI enhanced root elongation by inducing OH radical-induced cell wall loosening.. Exposure of plants to 0.5 g/L nZVI enhanced root elongation by 150-200% over that in the control, and further mechanistic studies showed that this occurred via nZVI-mediated OH radical-induced cell wall loosening. The oxidation capacity of nZVI, leading to release of H2O2, allowed it to cause OH radical-induced cell wall loosening in roots. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometers (MALDI-TOFMS)-based analysis clearly revealed that pectin-polysaccharides in roots were degraded; they are one of the main matrix-polysaccharide-connecting and load-bearing polymers in cell walls. Rapid elongation led to structural changes in root cell walls: reduction of cell wall thickness and a bias on the orientation of cellulose microfibrils. Additionally, the asymmetrical distribution of tensional strength resulted from the OH radical-induced cell wall loosening enhanced endocytosis. These findings emphasize that OH radical-induced cell wall loosening is important for mechanical regulation of the cell wall and provide new insights into the cellular responses of plants exposed to reactive metal nanoparticles.
- Keywords
- OXIDE NANOPARTICLES; CORTICAL MICROTUBULES; HYDROXYL RADICALS; ESCHERICHIA-COLI; CARBON NANOTUBES; PLANT-GROWTH; IN-VITRO; PHYTOTOXICITY; DECHLORINATION; TRANSLOCATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13991
- DOI
- 10.1021/ES4043462
- ISSN
- 0013-936X
- Article Type
- Article
- Citation
- ENVIRONMENTAL SCIENCE & TECHNOLOGY, vol. 48, no. 6, page. 3477 - 3485, 2014-03-18
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