Figure 5. Microscopic observation of FA-treated cucumber leaves that were stained with red ink.

The roots of the cucumber were immersed in red ink solution after being exposed to 0 ppm (a) and 100 ppm FA (b) for 9 h. The red ink was distributed throughout the whole leaves of the plants that were treated with 100 ppm FA (b), while less red colour was observed in the leaves of the control plants (a). The roots of the plant were immersed in red ink for 10 h. For analysis, the leaf directly above the fully expanded leaf was used. Scale bar = 5 mm.