Effects of zinc oxide nanoparticles on nutrient uptake and photosynthesis of lettuce
To evaluate phytotoxicity of zinc oxide nanoparticles (ZnO NPs) on plants, the effects of 0, 5, 50, 250 mg/L ZnO NPs on nutrient uptake and photosynthesis of lettuce were studied using hydroponic culture with Zn<sup>2+</sup> and bulk ZnO as comparisons. The results showed that ZnO NPs in...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2023-04-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2022.03.161 |
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| Summary: | To evaluate phytotoxicity of zinc oxide nanoparticles (ZnO NPs) on plants, the effects of 0, 5, 50, 250 mg/L ZnO NPs on nutrient uptake and photosynthesis of lettuce were studied using hydroponic culture with Zn<sup>2+</sup> and bulk ZnO as comparisons. The results showed that ZnO NPs inhibited the growth of lettuce, and biomass of lettuce decreased obviously with the increase of ZnO NPs concentration. Under the 5-250 mg/L ZnO NPs treatments, the contents of magnesium (Mg), iron (Fe), manganese (Mn) and copper (Cu) in the shoots of lettuce were reduced by 18.0%-33.3%, 19.0%-28.6%, 17.2%-28.3% and 17.4%-33.8%, respectively. Further-more, 50 and 250 mg/L ZnO NPs treatments significantly decreased the chlorophyll content and chloroplast activity of lettuce. Under the 5-250 mg/L ZnO NPs treatments, net photosynthetic rate (P<sub>n</sub>), stomatal conductance (G<sub>s</sub>), intercellular carbon dioxide concentration (C<sub>i</sub>) and transpiration rate (T<sub>r</sub>) of lettuce decreased by 33.7%-75.0%, 21.3%-36.7%, 11.2%-29.0% and 30.7%-83.4%, respectively; the maximum photochemical efficiency (F<sub>v</sub> /F<sub>m</sub>), photochemical quenching coefficient (qP), actual photochemical quantum yield (Φ<sub>PSⅡ</sub>), and electron transport rate decreased by 6.3%-18.8%, 7.0%-14.0%, 5.0%-20.0% and 5.8%-20.7%, respectively. The inhibition of 250 mg/L ZnO NPs on the photosynthesis of lettuce was much greater than that of the corresponding Zn<sup>2+</sup> release amount and bulk ZnO with the same concentration. These results indicate that ZnO NPs can inhibit the photosynthesis of lettuce by affecting the mineral nutrient absorption, hindering the chlorophyll synthesis, and reducing the photosystem Ⅱ activity. |
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| ISSN: | 1008-9209 2097-5155 |