Quick Search:

uzh logo
Browse by:
bullet
bullet
bullet
bullet

Zurich Open Repository and Archive 

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-390

Ragghianti, M; Bucci, S; Marracci, S; Casola, C; Mancino, G; Hotz, H; Guex, G D; Plötner, J; Uzzell, T (2007). Gametogenesis of intergroup hybrids of hemiclonal frogs. Genetical Research, 89(1):39-45.

[img]
Preview
Published Version
PDF
190kB

Abstract

European water frog hybrids Rana esculenta (R. ridibundaxR. 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.

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Zoology (former)
DDC:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:2007
Deposited On:11 Feb 2008 12:14
Last Modified:27 Nov 2013 18:45
Publisher:Cambridge University Press
ISSN:0016-6723
Publisher DOI:10.1017/S0016672307008610
PubMed ID:17517158
Citations:Web of Science®. Times Cited: 14
Google Scholar™
Scopus®. Citation Count: 16

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page