The effects of genome ploidy and posttreatment incubation on inactivation by nitrous acid (NA) were studied in normal, radio- and nitrous acid-sensitive strains of yeast. In normal yeast cells the increase of ploidy (haploid to triploid) resulted in "the protective effect", i.e. haploid cells were the most sensitive, triploid -- the most resistant. This "protective effect" is absent in polyploid yeast homozygous for the xrs1-5 (rad 54) mutation; in this case the NA-sensitivity rises with the increase of ploidy, i.e. haploid cells are the most resistant ones. The effect of liquid holding (LH) after the NA treatment depends on the genetic background and ploidy of treated cells. Posttreatment incubation in buffer has practically no effect on the survival of wild-type Berkeley's yeast strains (1n, 2n, 3n). The highly homozygous haploid strains from Zakharov' collection, both wild type and xrs1-5 mutant, exhibit no LH-recovery too. However the death of wild-type cells drastically rises in LH-condition as the ploidy increases. 24 hours incubation in buffer results in at least a ten-fold decrease in survival of wild type 2n, 3n, 4n cells. The loss of viability is proportional to the time of incubation, but the cell titer being constant. The strains (2n, 3n, 4n) homozygous for the xrs1-5 mutation (rad 54) show considerable LH-recovery. It is supposed that the xrs1-5 mutation results in the derepression of the prereplicative pathway of LH-recovery which eliminates the NA-INDUCED DAMAGE OF DNA.
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