Data/hora: 02/06/2024 13:45:34

Provedor de dados: 	Institutional Archive of Ifreme (ArchiMer)	
País: 	France	
Título: 	Influence of parentage upon growth in Ostrea edulis: evidence for inbreeding depression	
Autores: 	Naciri-graven, Y; Launey, Sophie; Lebayon, N; Gerard, Andre; Baud, Jean-pierre.	
Data: 	2000-10	
Ano: 	2000	
Resumo: 	Genetic variability for growth was analysed in three populations of Ostrea edulis, selected for resistance to the protozoan parasite Bonamia ostreae. This study was undertaken first to determine the potential for selection for growth in populations that have never been selected for this character, and second to estimate heterosis versus inbreeding depression. Growth was monitored in culture for 10 months. The selected populations (namely S85-G3, S89I-G2 and S89W-G2), their crossbred population and a control population were composed of full-sib families whose parents were already genotyped using five microsatellite markers. This genotyping allowed the estimation of genetic relatedness among pairs of parents. The parents' relatedness was then correlated with the growth performance of their offspring within each of the three populations, and inbreeding depression was estimated. The population effect for growth was highly significant, with the crossbred population having the highest growth rate, followed by S89I-G2 and S89W-G2, S85-G3 and the control population. The within-populations family effect was also highly significant, indicating, as well as the high value for heritability at the family level (between 0-57 and 0-92), that a potential for a further selection for growth still exists within the three populations. Estimates of inbreeding depression (relative to the mean, for complete inbreeding) were high (1 for S891-G2, 0.44 for S89W-G2 and between 0-02 and 0-43 for S85-G3), which correlates with the apparent heterosis for growth observed in the crossbred population. These results are discussed in the context of the future management of the selected populations	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2000/publication-2719.pdf	
Editor: 	Cambridge Univ Press	
Relação: 	http://archimer.ifremer.fr/doc/00000/2719/	
Formato: 	application/pdf	
Fonte: 	Genetical Research (0016-6723) (Cambridge Univ Press), 2000-10 , Vol. 76 , N. 2 , P. 159-168	
Fonte: 	Cambridge University Press