Abstract
The arrangement of cortical microtubules (MTs) in differentiating tracheids of Abies sachalinensis Masters was examined by confocal laser scanning microscopy after immunofluorescent staining. The arrays of MTs in the tracheids during formation of the primary wall were not well ordered and the predominant orientation changed from longitudinal to transverse. During formation of the secondary wall, the arrays of MTs were well ordered and their orientation changed progressively from a flat S-helix to a steep Z-helix and then to a flat S-helix as the differentiation of tracheids proceeded. The orientation of cellulose microfibrils (MFs) on the innermost surface of cell walls changed in a similar manner to that of the MTs. These results provide strong evidence for the co-alignment of MTs and MFs during the formation of the semi-helicoidal texture of the cell wall in conifer tracheids.
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Abbreviations
- MT:
-
cortical microtubule
- MF:
-
cellulose microfibril
- S1, S2 and S3:
-
the outer, middle and inner layers of the secondary wall
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The authors thank Mr. T. Itoh of the Electron Microscope Laboratory, Faculty of Agriculture, Hokkaido University, for his technical assistance. This work was supported in part by a Grant-in-Aid from the Ministry of Education, Science and Culture, Japan (no. 06404013).
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Abe, H., Funada, R., Imaizumi, H. et al. Dynamic changes in the arrangement of cortical microtubules in conifer tracheids during differentiation.. Planta 197, 418–421 (1995). https://doi.org/10.1007/BF00202666
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DOI: https://doi.org/10.1007/BF00202666