Abstract
Crosses were made between haploid wild-type and suppressive petite strains of bakers' yeast to obtain zygotes for analysis of mitochondrial heterogeneity. Wild-type × petite zygotes contained about 40% noncristate mitochondria when immediate mating mixtures were examined. The frequency of defective mitochondria had decreased to an average of 9.2% in 1-week-old zygote isolate cultures, and to 4.4% in slant cultures 1.5 years after initial zygote isolation. The latter value was not significantly different from values obtained with wild × wild zygotes of either age. The noncristate mitochondria were of two types: one lacking inner membrane invaginations or elaborations and the other containing concentrically arranged loops of inner membrane. The significance of these two types of respiration-deficient mitochondria is unknown. The gradual decrease in frequency of noncristate mitochondria, perhaps due to selection pressures in mixed chondriomes, was discussed as a further indication of the semiautonomous nature of the yeast organelle.
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