FIG. 1.

Anoxia-induced suspension of meiosis and sporulation in SK1 cells. SK1 cells allowed to initiate sporulation (A) in the continuous presence of oxygen have completed sporulation by hour 18, forming over 80% asci (B). In contrast, cells allowed to initiate sporulation in the presence of oxygen (C) but made anoxic from hours 6 to 18 did not complete the sporulation process (D). The scale bar represents 10 μm. (E) A plot of the percent asci as a function of time shows that cells made anoxic from hour 6 to hour 18 rapidly resumed sporulation when oxygen is restored at hour 18. Error bars represent standard errors of the means for four independent trials. Three hundred cells from each culture were counted at each time point.