Figure 6.

ROS accumulation in leaves of P1 inoculated sunflower seedlings exposed to different levels of hexavalent chromium (A) control (0 µg mL⁻¹), (B) 25 µg mL⁻¹, (C) 50 µg mL⁻¹, (D) 100 µg mL⁻¹, and (E) P1 strain + 0 µg mL⁻¹, (F) P1 + 25 µg mL⁻¹, (G) P1 + 50 µg mL⁻¹, and (H) P1 + 100 µg mL⁻¹. The seedlings were grown hydroponically (in half-strength Hoagland’s solution) for 16 days in a plant growth chamber. Fully expanded leaves were detached and stained with DAB to visualize ROS.