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Titolo:
Influence of parentage upon growth in Ostrea edulis: evidence for inbreeding depression
Autore:
Naciri-Graven, Y; Launey, S; Lebayon, N; Gerard, A; Baud, JP;
Indirizzi:
IFREMER, LGP, F-17390 La Tremblade, France IFREMER La Tremblade France F-17390 R, LGP, F-17390 La Tremblade, France IFREMER, LCPL, F-85230 Bouin, France IFREMER Bouin France F-85230IFREMER, LCPL, F-85230 Bouin, France
Titolo Testata:
GENETICAL RESEARCH
fascicolo: 2, volume: 76, anno: 2000,
pagine: 159 - 168
SICI:
0016-6723(200010)76:2<159:IOPUGI>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
BIVALVE SPISULA-OVALIS; BONAMIA-OSTREAE; FLAT OYSTERS; INTENSIVE SYSTEM; MYTILUS-EDULIS; HETEROZYGOSITY; HERITABILITY; LARVAE; JUVENILES; MORTALITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Naciri-Graven, Y Conservatoire & Jardin Bot, 1 Chemin Imperatrice,Case Postale 60, CH-1292 Geneva, Switzerland Conservatoire & Jardin Bot 1 Chemin Imperatrice,Case Postale 60 Geneva Switzerland CH-1292
Citazione:
Y. Naciri-Graven et al., "Influence of parentage upon growth in Ostrea edulis: evidence for inbreeding depression", GENET RES, 76(2), 2000, pp. 159-168

Abstract

Genetic variability for growth was analysed in three populations of Ostreaedulis, 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 populationhaving 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.

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Documento generato il 03/12/20 alle ore 15:18:29