- The ultrastructural localization of peroxidase in soybean (Glycine max L.) suspension culture cells and protoplasts is reported. In cells peroxidase is found primarily in the cell wall and at the tonoplast. Protoplasts and cells contain a vacuolar system which is differentiated with respect to peroxidase content since some vacuoles are found which do not contain peroxidase reaction product. The Golgi dictyosomes, coated and smooth vesicles contain peroxidase. Some of the multivesicular bodies have the reaction product as well. The results are discussed in terms of the pathways of sorting of peroxidase between the cell wall and vacuoles of cultured cells. 1985 Springer-Verlag.