Intracellular distribution of subcellular organelles revealed by antibody against xyloglucan during cell cycle in tobacco BY-2 cells

Summary Immunofluorescence microscopy using an antibody against xyloglucan (XG) revealed its dynamics during the cell cycle. In interphase tobacco BY-2 cells, punctate and scattered fluorescence was observed throughout the cytoplasm. Colocalization of such signals with cortical microtubules (MTs) was clearly observed on the membrane ghosts. They were also associated and accumulated on MT bundles of the preprophase band. Treatment of protoplasts with cytochalasin B prior to the preparation of the ghosts had no effect on the pattern of anti-XG staining, while treatment with propyzamide caused the disappearance of the staining. These results suggest an association of Golgi apparatus and/or Golgi-derived vesicles with MTs. In metaphase cells, the staining was dispersed in the cytoplasm, except in the area occupied by the metaphase spindle. During anaphase, a broad fluorescence band appeared between daughter chromosomes and gradually concentrated at the equatorial plane before formation of the phragmoplast. At telophase, a bright line of fluorescence appeared at the equatorial plane corresponding to the position of the cell plate. The length of the line increased as cytokinesis proceeded. Thus, we showed that immunofluorescence microscopy using anti-XG antibody can be considered as a powerful tool for the analysis of Golgi apparatus and Golgi-derived vesicles containing XG.