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J Bacteriol. 1968 August; 96(2): 457-461
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Respiratory-deficient Mutants in Saccharomyces lactis1

Alberta I. Herman2 and Patricia S. Griffin

a Northern Regional Research Laboratory, U.S. Department of Agriculture, Peoria, Illinois 61604

ABSTRACT

Six independent ultraviolet-induced respiratory-deficient mutants (petites) of Saccharomyces lactis were isolated and characterized. Two possessed a normal cytochrome spectrum, another displayed an increased level of all the cytochromes, and three suffered from a partial or complete loss of one or more of the cytochromes a, b, c, and c1. All of the mutants were segregational petites; none was vegetative. Determination of linkage relationships between mutants was restricted because matings between mutants, homozygous or heterozygous, for loci affecting cytochrome content were blocked at various stages in the mating-sporulating sequence. At least three of the petites were genetically nonidentical. Three of the mutations appeared to occupy loci within the same linkage group; two of the three mutations that mapped within this region were cytochrome-deficient. Growth at high or low temperatures, under increased osmotic pressure or in media supplemented with various fatty acids or sterols, did not relieve the physiological defects in these mutants. Reasons for the differences in survival of segregational and vegetative petites within this species are examined.

FOOTNOTES

2 Recipient of Public Health Service postdoctoral fellowship 5-F2-gm-13,112-02.

1 A portion of this work was presented at the 65th Annual Meeting of the American Society for Microbiology, Atlantic City, N.J., 1965.

J Bacteriol. 1968 August; 96(2): 457-461
Copyright © 1968 American Society for Microbiology. All Rights Reserved.





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