Compared with untreated control plants, the concentration of soluble sugars in plants treated with different concentrations of TiO2-NPs increased significantly, and when the concentration of TiO2-NPs was 500 mg/L, the highest soluble sugar content increased by 70%. . Figure 5 shows that different concentrations of TiO2-NPs have a positive effect on the soluble sugar content of broad bean seedlings, but there is no certain rule. It is only found that the maximum value will be reached under 500mg/L treatment.
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