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Surface coating changes the physiological and biochemical impacts of nano-TiO2 in basil (Ocimum basilicum) plants
- Source :
- Environmental Pollution. 222:64-72
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Little is known about the effects of surface coating on the interaction of engineered nanoparticles (ENPs) with plants. In this study, basil (Ocimum basilicum) was cultivated for 65 days in soil amended with unmodified, hydrophobic (coated with aluminum oxide and dimethicone), and hydrophilic (coated with aluminum oxide and glycerol) titanium dioxide nanoparticles (nano-TiO2) at 125, 250, 500, and 750 mg nano-TiO2 kg−1 soil. ICP-OES/MS, SPAD meter, and UV/Vis spectrometry were used to determine Ti and essential elements in tissues, relative chlorophyll content, carbohydrates, and antioxidant response, respectively. Compared with control, hydrophobic and hydrophilic nano-TiO2 significantly reduced seed germination by 41% and 59%, respectively, while unmodified and hydrophobic nano-TiO2 significantly decreased shoot biomass by 31% and 37%, respectively (p ≤ 0.05). Roots exposed to hydrophobic particles at 750 mg kg−1 had 87% and 40% more Ti than the pristine and hydrophilic nano-TiO2; however, no differences were found in shoots. The three types of particles affected the homeostasis of essential elements: at 500 mg kg−1, unmodified particles increased Cu (104%) and Fe (90%); hydrophilic increased Fe (90%); while hydrophobic increased Mn (339%) but reduced Ca (71%), Cu (58%), and P (40%). However, only hydrophobic particles significantly reduced root elongation by 53%. Unmodified, hydrophobic, and hydrophilic particles significantly reduced total sugar by 39%, 38%, and 66%, respectively, compared with control. Moreover, unmodified particles significantly decreased reducing sugar (34%), while hydrophobic particles significantly reduced starch (35%). Although the three particles affected basil plants, coated particles impacted the most its nutritional quality, since they altered more essential elements, starch, and reducing sugars.
- Subjects :
- food.ingredient
Starch
Health, Toxicology and Mutagenesis
02 engineering and technology
010501 environmental sciences
Toxicology
01 natural sciences
chemistry.chemical_compound
food
Glycerol
Food science
Sugar
0105 earth and related environmental sciences
chemistry.chemical_classification
Chromatography
biology
Basilicum
General Medicine
021001 nanoscience & nanotechnology
Ocimum
biology.organism_classification
Pollution
Reducing sugar
Surface coating
chemistry
Shoot
0210 nano-technology
Subjects
Details
- ISSN :
- 02697491
- Volume :
- 222
- Database :
- OpenAIRE
- Journal :
- Environmental Pollution
- Accession number :
- edsair.doi...........63aa82caa9403fd166c983fa778e64dd