Data/hora: 11/06/2024 06:50:42

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Fitness landscapes support the dominance theory of post-zygotic isolation in the mussels Mytilus edulis and M. galloprovincialis
Autores: | Bierne, Nicolas; Bonhomme, Francois; Boudry, Pierre; Szulkin, M; David, Pierre.
Data: | 2006-05
Ano: | 2006
Palavras-chave: | Mytilus; Dobzhansky Muller incopatibilities; Post zygotic isolation; Negative epistasis; Hybrid breakdown; Hybrid zone.
Resumo: | We studied the genetic basis of post-zygotic isolation in the marine mussels Mytilus edulis and Mytilus galloprovincialis. Evidence was obtained for a high number of recessive Dobzhansky-Muller substitutions in the genome of these two mussel taxa. We analysed the segregation of unlinked diagnostic markers in the progeny of two backcrosses and an F-2 cross, 36 h and 200 days after fertilization. Directional selection favouring M. galloprovincialis genotypes was observed in both kinds of cross. In the F-2, epistatic interactions between each pair of chromosome fragments mapped by the markers were identified in addition. Our results imply that homozygous-homozygous interactions are required for breakdown of coadaptation, in accordance with the dominance theory of post-zygotic isolation. Endogenous post-zygotic selection distributed over many loci throughout the genome provides the missing factor explaining the astonishing persistence and strength of barriers to neutral introgression in such a dispersive taxon as Mytilus.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/2006/publication-1350.pdf

DOI:10.1098/rspb.2005.3440

Editor: | Royal Society of London
Relação: | http://archimer.ifremer.fr/doc/00000/1350/
Formato: | application/pdf
Fonte: | Proceedings of the Royal society of London (B) (Biological sciences) (0962-8452) (Royal Society of London), 2006-05 , Vol. 273 , N. 1591 , P. 1253-1260
Fonte: | 2006 The Royal Society