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Journal of Bacteriology logoLink to Journal of Bacteriology
. 1993 May;175(10):3174–3181. doi: 10.1128/jb.175.10.3174-3181.1993

Volume growth of daughter and parent cells during the cell cycle of Saccharomyces cerevisiae a/alpha as determined by image cytometry.

C L Woldringh 1, P G Huls 1, N O Vischer 1
PMCID: PMC204640  PMID: 8491731

Abstract

The pattern of volume growth of Saccharomyces cerevisiae a/alpha was determined by image cytometry for daughter cells and consecutive cycles of parent cells. An image analysis program was specially developed to measure separately the volume of bud and mother cell parts and to quantify the number of bud scars on each parent cell. All volumetric data and cell attributes (budding state, number of scars) were stored in such a way that separate volume distributions of cells or cell parts with any combination of properties--for instance, buds present on mothers with two scars or cells without scars (i.e., daughter cells) and without buds--could be obtained. By a new method called intersection analysis, the average volumes of daughter and parent cells at birth and at division could be determined for a steady-state population. These volumes compared well with those directly measured from cells synchronized by centrifugal elutriation. During synchronous growth of daughter cells, the pattern of volume increase appeared to be largely exponential. However, after bud emergence, larger volumes than those predicted by a continuous exponential increase were obtained, which confirms the reported decrease in buoyant density. The cycle times calculated from the steady-state population by applying the age distribution equation deviated from those directly obtained from the synchronized culture, probably because of inadequate scoring of bud scars. Therefore, for the construction of a volume-time diagram, we used volume measurements obtained from the steady-state population and cycle times obtained from the synchronized population. The diagram shows that after bud emergence, mother cell parts continue to grow at a smaller rate, increasing about 10% in volume during the budding period. Second-generation daughter cells, ie., cells born from parents left with two scars, were significantly smaller than first-generation daughter cells. Second- and third-generation parent cells showed a decreased volume growth rate and a shorter budding period than that of daughter cells.

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Selected References

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