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J Bacteriol. 1973 July; 115(1): 358-366
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Cell Division in Yeasts: Movement of Organelles Associated with Cell Plate Growth of Schizosaccharomyces pombe1

Byron F. Johnson, Bong Y. Yoo and G. B. Calleja2

a Division of Biological Sciences, National Research Council of Canada, Ottawa, Ontario K1A OR6, and Department of Biology, University of New Brunswick, Fredericton, New Brunswick

ABSTRACT

Electron microscopy of dividing fission yeast cells shows establishment of an annular rudiment (AR) of electron-transparent material under the old cell wall as the first sign of elaboration of the cell plate. The AR grows centripetally, finally closing at the mid-point of the cell. During the inward growth of the AR it is thickened by addition of denser material which becomes the scar plug after fission; the electron-transparent material is lost at fission. Lying always between the cytoplasmic membrane and the cell wall is a dark layer of variable thickness. This layer becomes markedly thickened into a fillet at the base of the centripetally growing cell plate. The fission process begins after the cell plate is completely elaborated. One striking feature of fission is the migration of dense material from the fillet at the base of the cell plate outwardly through the matrix of the cell wall to its final resting place as a dark ring, a "fuscannel," adjacent to the fission scar. The inclusion of Golgi bodies in many sections suggests their involvement in cell plate elaboration, presumably through production of the dense bodies which are seen to fuse with the dark layer proximal to the growing cell plate.

FOOTNOTES

2 Present address: University of The Philippines, Natural Science Research Center, Diliman, Quezon City, The Philippines.

1 Issued as National Research Council of Canada publication no. 13332.

J Bacteriol. 1973 July; 115(1): 358-366
Copyright © 1973 American Society for Microbiology. All Rights Reserved.



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