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Plant and Cell Physiology, 1979, Vol. 20, No. 8 1471-1479
© 1979

Article

Simultaneous production of buds on mother and daughter cells of Saccharomyces cerevisiae in the presence of hydroxyurea

Kyoji Yamada and Michio Ito

Department of Biology, Faculty of Science, Nagoya University Chikusa-ku, Nagoya 464, Japan

Individual budding yeast cells, Saccharomyces cerevisiae, enclosed in small culture chambers were observed through two budding cycles to examine their behavior during growth and division. In the nutrient medium (YHG medium), the duration of the budding cycles was 77 min for mother cells and 90 min for daughter cells; a 13-min time lag between the two durations. Continuous exposure of cells to 16 or 32 mM hydroxyurea extended the duration of the cycles and increased the volume of the cells, resulting in the formation of abnormally large and equal-sized mother-daughter pairs. Each cell of these pairs subsequently produced buds simultaneously. Stained cell nuclei showed simultaneous nuclear division. This synchronous budding on mother-daughter pairs was repeated in the next budding cycle. The coordination of growth with division is discussed in relation to these results.

(Received August 11, 1979; )
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