Rana ridibunda varies geographically in inducing clonal gametogenesis in interspecies hybrids

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Abstract
Diploid F1 hybrids between Rana ridibunda from Adriatic SW Yugoslavia and Polish R. lessonae, and between Polish R. ridibunda and an unnamed species from SW Yugoslavia are shown by electrophoresis and examination of lampbrush chromosomes to contain both parental genomes in their diploid oocytes I. In contrast, central European R. ridibunda genomes in diploid hybrids, whether F1s or from natural hemiclonal lineages, induce exclusion of the lessonae genome in the germ line, only ridibunda translation products and endoreduplicated ridibunda chromosomes being detected in their diploid oocytes I. The data demonstrate geographic variation of R. ridibunda in the ability of its genomes to induce clonal gametogenesis in interspecies hybrids. They also suggest that genomes of the unnamed Yugoslavian species may be resistant to such exclusion.

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