Fig. 1

Effect of silicon (Si) amendments on soybean plants 21 days after inoculation with Phytophthora sojae. a Plants in the Si⁺ treatment were clearly healthier than non-treated plants with more developed roots, stems and leaves. Comparative X-ray superimposed scanning electron micrographs of soybean root tips in plants treated (b) or not (c) with Si. At least, five plants per treatments were observed. A color scale of Si deposition was used, with blue indicating low Si and red high Si deposition. Black areas indicated no Si deposition