<i>Rana ridibunda</i> varies geographically in inducing clonal gametogenesis in interspecies hybrids

Hotz, Hansjürg; Mancino, Giorgio; Bucci-Innocenti, Stefania; Ragghianti, Matilde; Berger, Leszek; Uzzell, Thomas

doi:10.1002/jez.1402360210

Cited by 97 publications

(87 citation statements)

References 23 publications

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“…Like other non-hybridogenetic hybrids between Rana ridibunda and Rana lessonae (Hotz et al, 1985;Bucci et al, 1990), it evidenced a disturbed gametogenesis caused by the combination of the two heterospecific genomes. The observed approximately triploid spermatogonial metaphases, for example, probably reflect endoreduplication of the L genome without prior elimination of the R genome.…”

Section: Discussionmentioning

confidence: 76%

“…The non-hybridogenetic offspring of cross 02.43 is an example of such hybrids. In contrast, crosses between central European Rana ridibunda and Rana lessonae almost always show hybridogenetic reproduction (Hotz et al, 1985).…”

Section: Discussionmentioning

confidence: 89%

“…Hybrids between Rana ridibunda and Rana lessonae, for example, are sterile when the R genome stems from southern parts of the Rana ridibunda range (Hotz et al, 1985 ;Berger et al, 1994 b;unpublished data). Such non-hybridogenetic hybrids show incomplete pairings between the Rana ridibunda and Rana lessonae genomes in meiosis I, which probably lead to aneuploid gametes and thus render the individuals sterile (Hotz et al, 1985;Bucci et al, 1990). The non-hybridogenetic offspring of cross 02.43 is an example of such hybrids.…”

Section: Discussionmentioning

confidence: 99%

“…It has been hypothesized that the R genome induces the germ line exclusion of the L genome (e.g. Hotz et al, 1985;Guerrini et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Gametogenesis of intergroup hybrids of hemiclonal frogs

et al. 2007

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European water frog hybrids Rana esculenta (R. ridibundarR. lessonae) reproduce hemiclonally, by hybridogenesis : in the germ line they exclude the genome of one parental species and produce haploid gametes with an unrecombined genome of the other parental species. In the widespread L-E population system, both sexes of hybrids (E) coexist with R. lessonae (L). They exclude the lessonae genome and produce ridibunda gametes. In the R-E system, hybrid males coexist with R. ridibunda (R); they exclude either their ridibunda or their lessonae genome and produce sperm with a lessonae or with a ridibunda genome or a mixture of both kinds of sperm. We examined 13 male offspring, 12 of which were from crosses between L-E system and R-E system frogs. All were somatically hybrid. With one exception, they excluded the lessonae genome in the germ line and subsequently endoreduplicated the ridibunda genome. Spermatogonial metaphases contained a haploid or a diploid number of ridibunda chromosomes, identified through in situ hybridization to a satellite DNA marker, and by spermatocyte I metaphases containing a haploid number of ridibunda bivalents. The exception, an F1 hybrid between L-E system R. lessonae and R-E system R. ridibunda, was not hybridogenetic, showed no genome exclusion, and evidenced a disturbed gametogenesis resulting from the combination of two heterospecific genomes. None of the hybridogenetic hybrids showed any cell lines excluding the ridibunda genome, the pattern most frequent in hybrids of the R-E system, unique to that system, and essential for its persistence. A particular combination of R-E system lessonae and R-E system ridibunda genomes seems necessary to induce the R-E system type of hemiclonal gametogenesis. Gametogenesis of intergroup hybrids of hemiclonal frogs SummaryEuropean water frog hybrids Rana esculenta (R. ridibundarR. lessonae) reproduce hemiclonally, by hybridogenesis : in the germ line they exclude the genome of one parental species and produce haploid gametes with an unrecombined genome of the other parental species. In the widespread L-E population system, both sexes of hybrids (E) coexist with R. lessonae (L). They exclude the lessonae genome and produce ridibunda gametes. In the R-E system, hybrid males coexist with R. ridibunda (R) ; they exclude either their ridibunda or their lessonae genome and produce sperm with a lessonae or with a ridibunda genome or a mixture of both kinds of sperm. We examined 13 male offspring, 12 of which were from crosses between L-E system and R-E system frogs. All were somatically hybrid. With one exception, they excluded the lessonae genome in the germ line and subsequently endoreduplicated the ridibunda genome. Spermatogonial metaphases contained a haploid or a diploid number of ridibunda chromosomes, identified through in situ hybridization to a satellite DNA marker, and by spermatocyte I metaphases containing a haploid number of ridibunda bivalents. The exception, an F1 hybrid between L-E system R. lessonae and R-E system R. ridibunda, w...

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

“…It has been hypothesized that the R genome induces the germ line exclusion of the L genome (e.g. Hotz et al, 1985;Guerrini et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Gametogenesis of intergroup hybrids of hemiclonal frogs

et al. 2007

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“…hoek, 1979(Vrijen-. hoek, , 1993, frogs (Hotz et a!., 1985), snails (Lively, 1992), moths (Harshman & Futuyama, 1985) and cladocerans (Innes et a!., 1986;Hebert et a!., 1988). However, surprisingly little attention has been directed towards aphids which are excellent candidates for such studies.…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity and mode of reproduction in French populations of the aphid Rhopalosiphum padi L.

Simon¹,

Carrel²,

Hebert

et al. 1996

Heredity

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Flolocyclic individuals of the aphid Rhopalosiphum padi reproduce by cyclical parthenogenesis, while anholocyclic individuals are obligate parthenogens. Although admixed on the secondary hosts in summer, holocyclic and anholocyclic populations occur separately on the primary and secondary hosts during winter and spring. In this study, we compared the genetic diversity and population structure of holocyclic and anholocyclic populations collected in spring in the northern half of France. We also analysed the genetic composition of summer populations of R. padi on its secondary hosts. In spring, holocyclic populations were in Hardy-Weinberg equilibrium at individual loci and had a relatively high genotypic diversity. Conversely, anholocyclic populations deviated from Hardy-Weinberg equilibrium and often consisted of a single clone. Moreover, these populations showed very low mean heterozygosities compared with holocyclic populations. Analysis of summer populations suggested that in regions with cold winters, summer populations were largely recruited from holocyclic clones, whereas in areas with mild winters, summer populations were mainly derived from anholocyclic clones. These results permit an assessment of the geographical distribution of the two modes of reproduction on a large scale. The reasons for the diminished heterozygosity of anholocyclic populations are also discussed in relation to the mechanisms which may induce transitions to asexuality in aphids.

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