Orientation of Wall Microfibrils in A vena Coleoptiles and Mesocotyls and in Pisum Epicotyls

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Microfibrils (MFs) on the inner surface of the walls of Avena coleoptile and mesocotyl cells and of Pisum epicotyl cells were examined by a replica method. In the elongating epidermis of these three organs, cells having MFs that were transverse, oblique or longitudinal to the elongation axis were intermingled. In the elongating parenchymal tissues, all cells deposited MFs transversely. In non-elongating cells of Avena coleoptiles and Pisum epicotyls, the orientation of MFs On the inner wall surface of both epidermal and parenchymal cells was more longitudinal than in elongating cells. These observations on the orientations of MFs are compatible with those our previously reported observations on the orientations of microtubules (MT) (Iwata and Hogetsu 1988). Disruption of MTs Of Avena coleoptiles by treatment with amiprophosmethyl caused changes in the orientation of deposition of MFs. These results support the idea that MFs are usually co-aligned with MTs in organ cells and that the orientation of MFs is controlled by MTs. The averaged direction of MFs, visualized under polarized light, showed a clear difference between the epidermal and inner-tissue cell walls in the elongating regions of the three organs. In almost all elongating and non-elongating epidermal cells, the averaged direction of MFs was longitudinal, while it was transverse in all inner-tissue cells.
日本植物生理学会の論文