Fig. 1

Intensity of protoplast fluorescence after staining with different concentrations of: (I) scopoletin, blue fluorescence (A-J), scale bars: 10 µm (B, D, F, H, J), 50 µm (A, C, E, G, I); (II) fluorescein diacetate, green fluorescence (A-D) and rhodamine B isothiocyanate, red fluorescence (E–H), scale bars: 10 µm (B, D, F, H), 20 µm (A, C, E, G)