TY - JOUR

T1 - Physiological studies on the effect of Ca2+ on the duration of the lag phase of Saccharomyces cerevisiae

AU - Friis, J

AU - Christensen, Søren Tvorup

AU - Szablewski, L

AU - Schousboe, P

AU - Rasmussen, L

N1 - Keywords: Calcimycin; Calcium; Culture Media; Saccharomyces cerevisiae

PY - 1994

Y1 - 1994

N2 - Cell multiplication and growth of Saccharomyces cerevisiae were followed in 2-ml test tubes containing Wickerham's synthetic medium or very dilute synthetic media supplemented in various ways. The ability of the cell cultures to leave the lag phase and enter the exponential phase of growth was investigated. Multiplication was assessed by microscopical observation. The results showed great differences in times required for the cultures to leave the lag phases and begin multiplication. In Wickerham's medium, all cultures grew well 6 h after inoculation. In the dilute medium, several days elapsed before all the cultures grew. These cultures went into exponential growth with approximately first order kinetics. In the unsupplemented medium, the 'half-lives' in the lag phase were about 28 h. Addition of either Ca2+ or Ca2+ plus A23187 (calcimycin) reduced the half-lives to 10 and 6 h, respectively. The doubling times in the exponential phases of growth were not shortened by these additions. We suggest that Ca2+ plays a crucial role as a signal to switch on the mode of cell proliferation in S. cerevisiae.

AB - Cell multiplication and growth of Saccharomyces cerevisiae were followed in 2-ml test tubes containing Wickerham's synthetic medium or very dilute synthetic media supplemented in various ways. The ability of the cell cultures to leave the lag phase and enter the exponential phase of growth was investigated. Multiplication was assessed by microscopical observation. The results showed great differences in times required for the cultures to leave the lag phases and begin multiplication. In Wickerham's medium, all cultures grew well 6 h after inoculation. In the dilute medium, several days elapsed before all the cultures grew. These cultures went into exponential growth with approximately first order kinetics. In the unsupplemented medium, the 'half-lives' in the lag phase were about 28 h. Addition of either Ca2+ or Ca2+ plus A23187 (calcimycin) reduced the half-lives to 10 and 6 h, respectively. The doubling times in the exponential phases of growth were not shortened by these additions. We suggest that Ca2+ plays a crucial role as a signal to switch on the mode of cell proliferation in S. cerevisiae.

U2 - 10.1111/j.1574-6968.1994.tb07197.x

DO - 10.1111/j.1574-6968.1994.tb07197.x

M3 - Journal article

C2 - 7988895

VL - 123

SP - 33

EP - 36

JO - F E M S Microbiology Letters

JF - F E M S Microbiology Letters

SN - 0378-1097

IS - 1-2

ER -