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GENE INTERACTIONS BETWEEN POTASSIUM-SENSITIVE AND POTASSIUM-RESISTANT MUTATIONS OF PARAMECIUM TETRAURELIA
Donald L. Cronkite 1
1 Biology Department, Hope College, Holland, Michigan 49423
Two unlinked recessive mutations (ks-1 and ks-2 ) have been induced in Paramecium tetraurelia stock 51. Wild-type survives and grows when up to 30 mm KCl is added to the medium, but the mutants cease to grow and die when added KCl reaches 20–25 m m. These K+-sensitives have been crossed to stocks containing the K+-resistant genes, fA (very resistant) and kA (moderately resistant). All four genes are unlinked. Double mutants of ks-1 and either kA or fA are as resistant as the resistant member of the pair. Doubles of ks-2 and kA are like wild type, and doubles of ks-2 and fA are shifted from high resistance toward wild type. Gene ks-2 acts like a suppressor of kA and fA. This suppression can be understood in terms of the known biochemical defects of the mutants.
Submitted on August 3, 1982Accepted on October 1, 1982
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