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Boudry, Pierre; Haffray, Pierrick. |
The most significant genetic improvement for the production of Pacific oyster (Crassostrea gigas) in France to date has been through the breeding of triploids, especially since the development of tetraploids. Triploid oysters commonly resist summer mortality better than diploids. This is most probably because reproductive allocation is so important in this phenomenon. Quantitative genetics studies strongly suggest that a significant gain in resistance to summer mortality, or other traits of interest, could be obtained by selective breeding. Practical difficulties however, and the high cost of breeding large numbers of families under common conditions over many generations remain major constraints to family-based selective breeding in oysters. In the last... |
Tipo: Text |
Palavras-chave: Polyploidization; Selective breeding; Genetic; Crassostrea gigas; Pacific oysters. |
Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/acte-3438.pdf |
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Chen, C.-W.; Ngan, L.T.; Hidayat, A.; Evangelista, L.; Nooteboom, H.P.; Chiou, W.-L.. |
Davallia repens and its close relatives have been identified as a species complex in this study because of the existence of continuously morphological variation. To decipher its evolutionary history, integrated methodologies were applied in this study including morphology, cytology, reproductive biology and molecular phylogeny. Analysis of morphological characters reveals several important discriminating characteristics, such as the shape of stipe scales, frond and indusium. Both diploid and polyploid forms are present in the complex and reproduce sexually and by apogamy, respectively. The incongruence between cpDNA and nDNA phylogeny indicates a hybrid origin for most polyploid individuals. Based on the present results, we hypothesize that there were at... |
Tipo: Article / Letter to the editor |
Palavras-chave: Apogamy; Davallia repens; Hybridization; Polyploidization. |
Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/525117 |
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