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Open AccessArticle

Biochemical Response of Oakleaf Lettuce Seedlings to Different Concentrations of Some Metal(oid) Oxide Nanoparticles

1
Department of Horticulture, University of Agriculture in Krakow, 31-425 Kraków, Poland
2
Department of Vegetable Sciences and Floriculture, Mendel University in Brno, 691 44 Lednice, Czech Republic
3
Department of Plant Biology and Biotechnology, University of Agriculture in Krakow, 31-425 Kraków, Poland
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(7), 997; https://doi.org/10.3390/agronomy10070997
Received: 5 June 2020 / Revised: 8 July 2020 / Accepted: 9 July 2020 / Published: 11 July 2020
(This article belongs to the Special Issue From Biofortification to Tailored Crops and Food Products)
Nanoparticles (NPs) significantly modify the physiological functions and metabolome of plants. The purpose of the study was to investigate the effect of CeO2, Fe2O3, SnO2, TiO2, and SiO2 nanoparticles, applied in foliar spraying of oakleaf lettuce at concentrations 0.75% to 6%, on the antioxidant enzyme activity and content of non-enzymatic antioxidants, chlorophyll pigments, fresh weight (FW) and dry weight (DW). It was found that 3% Fe2O3-NPs caused a 27% decrease in fresh weight compared to control plants. Fe2O3-NPs caused an increase in dry weight (g 100 g−1 FW) when compared to the control for all concentrations, but total DW (g per plant) was similar for all NPs treatments. Significant increases in chlorophyll a + b content after treatment with 1.5% and 6% SiO2-NPs, 3% Fe2O3-NPs, and 3% TiO2-NPs were noted. Fe2O3-NPs caused a significant increase in the activity of ascorbate peroxidase, guaiacol peroxidase, and catalase (only for 3% Fe2O3-NPs). SnO2-NPs decreased ascorbate peroxidase (APX) and guaiacol peroxidase (GPOX) activity (for all tested concentrations) but increased catalase (CAT) activity when a 3% suspension of these NPs was applied. The level of glutathione (GSH) increased due to application of all metal/metalloid oxides, with the exception of SnO2-NPs. When all concentrations of TiO2-NPs were applied, L-ascorbic acid increased significantly, as well as increasing at higher concentrations of SiO2-NPs (3% and 6%) and at 0.75% and 3% Fe2O3-NPs. SiO2-NPs and TiO2-NPs significantly elevated the carotenoid and total phenolic content in treated plants compared to the control. The total antioxidant capacity of plants treated with 3% CeO2-NPs was almost twice as high as that of the control. View Full-Text
Keywords: abiotic stress; antioxidants; Lactuca sativa L. var. foliosa; foliar exposure; nanomaterials abiotic stress; antioxidants; Lactuca sativa L. var. foliosa; foliar exposure; nanomaterials
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Jurkow, R.; Sękara, A.; Pokluda, R.; Smoleń, S.; Kalisz, A. Biochemical Response of Oakleaf Lettuce Seedlings to Different Concentrations of Some Metal(oid) Oxide Nanoparticles. Agronomy 2020, 10, 997.

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