Do Oxytetracycline and Ciprofloxacin Affect Growth Phenotype, Leaf Photosynthetic Enzyme Activity, Nitrogen Metabolism, and Endogenous Hormone Homeostasis in Maize Seedlings?

As illustrated in Figure 5 , the impact of antibiotics on maize root activity exhibited an overall trend of initial enhancement followed by suppression, with variations observed based on antibiotic type and concentration.

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Relative Water Content of Maize Seedling Leaves As shown in Figure 3 , compared with CK, under OTC treatment, the relative water content of maize leaves showed a trend of increasing first and then decreasing.

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When the OTC concentration was 3 mg·L −1 , the relative water content of leaves showed an increasing trend, with a promotion rate of 5.24%; at 5 mg·L −1 , it did not reach a significant difference level; at 30–120 mg·L −1 , it began to show an inhibitory effect, with inhibition rates of 8.42%, 9.43%, and 18.89%, respectively.

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