Figure 1.

Comparison between root and stem delivery. Streptomycin content in various tissues in citrus plants treated with 200 µg·mL⁻¹ streptomycin solution for 24 h via root or stem delivery methods (A). Oxytetracycline content in various tissues in citrus plants treated with 200 µg·mL⁻¹ oxytetracycline solution for 72 h via root or stem delivery methods (B). For these analyses, the stem bark was dissected into the outer bark tissue (representing the phloem) and the inner bark (representing the xylem). Data are the means ± SD of five biological replicates. Columns with a p-value less than 0.05 indicate statistically significant differences between root and stem delivery method by Student’s t-test.