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

Jurkow, Rita; Sękara, Agnieszka; Pokluda, Robert; Smoleń, Sylwester; Kalisz, Andrzej

doi:10.3390/agronomy10070997

Cited by 29 publications

(25 citation statements)

References 46 publications

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“…A statistical analysis of the main effect means confirmed the elevated content of L-ascorbic acid in NPs treated plants. In a previous study, where higher concentrations of TiO 2 -NPs were applied (1.5%; 3%; 6%) to the oakleaf lettuce plants, we also observed an elevated level of L-ascorbic acid when compared with the control [ 30 ]. Similarly, Silva et al [ 55 ] found (for wheat) an increase in the levels of this compound for all TiO 2 -NP treatments (5, 50, and 150 mg·L −1 ).…”

Section: Resultsmentioning

confidence: 58%

“…The opposite trend was observed at t5, when the control lettuce had slightly more FW and DW than TiO 2 -NPs treated plants, but this was not confirmed statistically. Summing up, the influence of TiO 2 -NPs on oakleaf lettuce growth turned out to be relatively small, as in an earlier experiment, with higher concentrations of TiO 2 -NPs (1.5–6%), no significant changes occurred in FW and DW, in comparison with the control seedlings [ 30 ].…”

Section: Resultsmentioning

confidence: 89%

“…Lei et al [ 61 ] reported a higher APX activity in spinach when the plants were treated with TiO 2 -NPs. In an earlier experiment on oakleaf lettuce subjected to 1.5% and 3% suspensions of TiO 2 -NPs, we showed a significant decrease in APX activity, by 25.8% and 29.0%, respectively, in comparison with the control [ 30 ]. Such a decrease was also noted in the present experiment at the t2, t3, and t5 sampling points.…”

Section: Resultsmentioning

confidence: 98%

“…This contradicts the data received by Lei et al [ 61 ], who showed an increased activity of guaiacol peroxidase in spinach subjected to TiO 2 -NPs. In a previous report, there was no effect of spraying oakleaf lettuce with 1.5% and 3% TiO 2 -NPs on the alteration of GPOX activity, but the application of TiO 2 -NPs as 6% suspension caused a significant increase in the activity of this enzyme, when compared with the control [ 30 ]. Such a decrease in GPOX activity in TiO 2 -NPs plants at the t5 sampling in the present study is difficult to explain.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, the effects of the foliar application of TiO 2 -NPs on the physiological responses of oakleaf lettuce seedlings, covering antioxidant enzyme activities and non-enzymatic antioxidant contents, as well as on fresh and dry weights of the plants, were investigated. We chose a low dose of TiO 2 -NPs, based on our previous research [ 30 ], but we also focused on a time-dependent response of plants to NPs treatment. This allows us to better track changes in plant metabolism and assess the severity of stress that could be caused by TiO 2 -NPs, the activity of antioxidant mechanisms, and the process of plant acclimatization.…”

Section: Introductionmentioning

confidence: 99%

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Sequential Changes in Antioxidant Potential of Oakleaf Lettuce Seedlings Caused by Nano-TiO2 Treatment

et al. 2021

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Nowadays, there is an increasing interest in nanoparticle (NP) technology used in household and industrial products. It could cause an accumulation and dispersion of NPs in the environment, with possible harmful effects on living organisms. Nanoparticles significantly affect plants and alter their physiology and biochemical pathways, and nanotechnology can be used to improve plant characteristics that are desirable by humans. Therefore, more extensive studies of NP interactions with plants are still needed. The aim of this report is to investigate the effect of TiO2 nanoparticles (TiO2-NPs) on the enzymatic and non-enzymatic antioxidants, fresh and dry weights, and malondialdehyde contents in oakleaf lettuce seedlings. Plants were foliar treated with a 0.75% suspension of TiO2-NPs, while control plants were sprayed with deionized water. Leaves were sampled 4, 7, 9, 11, and 13 days after the treatment. The effects of TiO2-NPs were time-dependent, but the most spectacular changes were observed 4 days after the treatment. Exposure of the plants to TiO2-NPs significantly increased the contents of glutathione at all sampling points, total phenolics at days 4 and 13, and L-ascorbic acid at 4, 7, and 11 days after the treatment. Elevated levels of ascorbate peroxidase and guaiacol peroxidase activities were recorded at days 4 and 13, respectively. Total antioxidant capacity increased initially in treated seedlings, when compared with the control, and then decreased. On day 7, higher fresh and dry weights, as well as malondialdehyde contents in TiO2-NPs treated plants were observed, compared with the control. The study demonstrated that the activation of some antioxidant system components due to TiO2-NPs treatment was connected with the induction of mild oxidative stress, with no external symptoms of NP toxicity in oakleaf lettuce.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 89%