FIGURE 6.

Effects of CdCl₂ on steady H₂O₂ flux in roots of ectomycorrhizal (MAJ and NAU) and non-mycorrhizal (NM) Populus × canescens plants. Ectomycorrhizal (MAJ and NAU) and NM P. × canescens plants were subjected to 50 μM CdCl₂ for 30 min. Control roots were well fertilized but treated without CdCl₂. H₂O₂ flux was measured along root axis, 100–2,300 μm from the apex, at intervals of 200–300 μm. Each point is the mean of 4–5 individual plants, and bars represent the standard error of the mean. Asterisks denote significant difference at P < 0.05 between treatments.