Apoplastic Pathway in the Root System of Euonymus japonicus

Abstract

The purpose of this study is to identify the apoplastic pathway in the root systems of Euonymus japonicus in relation to their development. Tinopal CBS, a fluorescence dye staining the cell wall, was used as a tracer of the apoplastic pathway. The inflow of the dyeing agent to the vascular tissues from a branch separation point was not observed. Although the dyeing agent did not enter into the progressing young primary root system, which did not contain a dead root, it entered into the mature root system containing a dead root. It was inferred that the dead roots were more important than the branching points of the lateral roots as an entrance of an apoplastic flow.