Apogamic induction of haploid plasmodia in a myxomycete,Didymium iridis |
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Authors: | CD Therrien OR Collins |
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Institution: | 2. Pennsylvania State University, University Park, Pennsylvania 16801, USA;3. Department of Botany, University of California, Berkeley, California 94720 USA |
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Abstract: | Interisolate crosses between haploid (mean DNA = 0.32) CR 5-5 (A2) myxamoebae and polyploid (mean DNA = 1.80) CR 2–25 (A5) myxamoebae of the myxomycete Didymium iridis result in plasmodia that have the haploid (mean DNA = 0.32) DNA content rather than the predicted polyploid value. F1 clones possess the mating type allele of the CR 5-5 clone only, and they also have the same mean DNA content as CR 5-5 myxamoebae. Crosses between these F1 clones and CR 2–25 myxamoebae again resulted in the production of haploid plasmodia. Hence, the polyploid CR 2–25 clone appears to induce the CR 5-5 clone to produce plasmodia without involving itself in nuclear fusion. |
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