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Abundance of antibiotic resistance genes (ARGs) in the endophytic system of pakchoi under different dosages of antibiotic exposure. (A) tetX gene in TC-treated plants; (B) blaCTX-M gene in CPL-treated plants; (C) sul1 and sul2 genes in SMX-treated plants. Values are mean ± SD (n = 3). Different letters on the top of the error bars indicate statistical difference among the treatments (p < 0.05).
