It depends what you want to see. The root meristem is full of dividing cells. So you can use DAPI to stain nuclei and/or propidium iodide to stain the cell wall. Then, you can use normal fluorescence or confocal microscopy to identify the dividing cells.
Yeah, maybe. In our field, Haematoxylin was used to detect early cell divisions previously. I have search for that staining method, but unfortunately, they all refered to "Dudley et al., 1987" and i could not get the paper.