Apoplastic Pathways of Tree Species Roots Identified by Fluorescent Dye

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The object of this study was to visually determine the pathway of apoplastic sodium ion uptake in roots of seven tree species. The area of the apoplastic pathway was likely to restrict sodium ion absorption and was identified by Tinopal CBS, a fluorescent dye staining cellulose. The stained area did not correspond to the absorption coefficient of the sodium ion. It was suggested there was another apoplastic pathway for sodium ion that was not detectable by the fluorescent dye.