Genetic analysis of axonemal mutants inParamecium tetraureliadefective in their response to calcium

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Abstract
Six axonemal mutants of Paramecium tetraurelia have been isolated that are unable to respond properly to calcium. The mutants, designated atalantas, cannot swim backward when stimulated by ions or heat. Genetic analyses reveal that all six mutants are recessive and fall into four complementation groups. Three of the mutants in one complementation group are phenotypically non-leaky, one is leaky and two are extremely leaky, only displaying their phenotypes at elevated temperatures. The complete mutants, ataA, are also abnormal in their forward swimming. This abnormality co-segregates with the inability to swim backward. ataA1 is not allelic to several membrane mutants of P. tetraurelia.