1887

Abstract

Hybridization experiments were carried out between strains of the myxomycete which differed in their sensitivities to the cations Na, K, Mg and Ca as determined by the threshold for changes in membrane potential on application of these ions. The sensitivities were explicable on the basis of control by three genes ( and ) for monovalent cations, magnesium and calcium, respectively, with low sensitivity dominant. Departures from the expected ratios for three unlinked loci are explicable by high sensitivity for divalent cations reducing viability, but the additional possibility that high divalent cation sensitivity cannot be expressed in the presence of low monovalent cation sensitivity has not been excluded. Chemotactic thresholds corresponded with membrane potential thresholds.

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1983-08-01
2021-05-16
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