Summary
Examination of sectioned cells fixed in KMnO4 has shown that the wall of the first bud of a cell of Saccharomycodes ludwigii arises as an extension of the main wall of the parent, while in subsequent buds it develops by extension of the half-septum remaining at a previous detachment scar. Septa are formed by the deposition of wall material on each side of an electron transparent plate which develops centripetally. Structural changes occur in the marginal region of the septum prior to rupture of the main wall and the separation of cells at the surface of the septum-plate. The broken walls remain as annular rings around the scars following the successive development of buds at both apices of the cell.
In Saccharomyces cerevisiae the bud wall arises as a direct extension of the parent wall or as an extension of an additional inner layer developed locally.
The two types of bud origin are compared in the two yeasts and a comparison is also made with the development of buds, fission cells, conidia and germ tubes in other organisms.
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Gay, J.L., Martin, M. An electron microscopic study of bud development in Saccharomycodes ludwigii and Saccharomyces cerevisiae . Archiv. Mikrobiol. 78, 145–157 (1971). https://doi.org/10.1007/BF00424871
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DOI: https://doi.org/10.1007/BF00424871