Abstract
Plastids in etiolatedAvena leaves were studied by electron microscopy of thin sectioned material fixed in glutaraldehyde and osmium tetroxide and embedded in Epon. Each plastid contains one—three prolamellar bodies. These are highly ordered systems, the membraneous component of which consists of interconnected tubules lying in the three major axes of a cubic lattice. Where three tubules (one in each axis of the lattice) meet and fuse at the corners of each unit cell, their unit membranes are smoothly confluent so that the principal curvatures of the membrane surface are of opposite sign at every point. A face view of a unit cell shows four tubules delimiting a circular opening of diameter 380 Å. The diameter of the tubules is 210 Å at their narrowest point, i. e. half way along the edges of the unit cells. The plastid stroma penetrates the prolamellar body via the 380 Å openings, and contributes ribosome—like particles to the system. These particles are centrally located, one in each unit cell.
The literature on prolamellar bodies is reviewed, it is concluded that this type of organisation is widespread in plants. Structures with similar geometry are described, and it is suggested that the unit membranes of the lattice are laid down on contours of uniform “field” strength centred on the lattice of ribosome-like particles. The surface area of membrane in a prolamellar body is estimated.
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Gunning, B.E.S. The greening process in plastids. Protoplasma 60, 111–130 (1965). https://doi.org/10.1007/BF01248133
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DOI: https://doi.org/10.1007/BF01248133