Summary
The distribution of particles on the surface of the plasmalemma in the collenchyma of Apium graveolens was studied by the freeze-etching technique. The aim was to determine whether the distribution of particles was related to the known longitudinal or transverse orientation of cellulose microfibrils in different layers of the walls of these cells. Preliminary statistical studies have shown no obvious correlation between particle distribution and microfibril orientation although the distribution appeared uniform rather than random. Qualitatively, the particle distribution on the plasmalemma of differentiating xylem fibres of Eucalyptus maculata and of the cortical parenchyma of Avena sativa coleoptiles appeared to be similar to that observed on the plasmalemma of Apium. No correlation between the particle distribution and the microfibril orientation known to exist in the walls of these cells could be discerned.
The orientation of microtubules in the cytoplasm of collenchyma cells of Apium graveolens was parallel to the microfibril orientation in many instances, but exceptions were noted. A possible interpretation for this variation is discussed. It is concluded that the microtubules are the structures which are most likely to be involved in determining microfibril orientation in the cell wall.
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Chafe, S.C., Wardrop, A.B. Microfibril orientation in plant cell walls. Planta 92, 13–24 (1970). https://doi.org/10.1007/BF00385558
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DOI: https://doi.org/10.1007/BF00385558