Mono- and polychromatic inner shell phenotype diversity in Pinctada margaritifera donor pearl oysters and its relation with cultured pearl colour

Abstract : The pearl oyster Pinctada margaritifera has the specific ability to produce pearls with the widest range of colours among all pearl oyster species. This pearl colour diversity originates from the mantle biomineralising tissue (graft) of the donor oyster, which is originally responsible for the variety of colours of the inner shell surface. This study aimed to: 1) assess the geographic distribution and establish a first stocklist of the colourful oyster phenotypes used as donors in French Polynesia, and 2) investigate the phenotypic relation between inner shell colouration and the corresponding colour of harvested pearls. With the support of a pearl farmers' network, we investigated the different donor phenotype frequencies among five collection sites (Ahe, Apataki, Takaroa, TakumeandMangareva).Thisdonorevaluationwasmadeduringgraftingofpearloysters(N=49,938)obtained from collector stations. Results showed that pearl production is mainly based on six common colourful donor phenotypes classified as monochromatic and polychromatic profiles, which shown different frequencies amongthecollectionsites.Experimentalgrafts(N=4640)werethenrealisedandsubsequentcultureconducted at a single site in order to avoidpearl colour variation due to environmental influences. Traceability between do- nors (N = 232) and pearls (N = 2776), revealed that: 1) yellow (gold) and aubergine (reddish) pearls could be mostlyobtainedbyusingthemonochromaticyellowandreddonor phenotypes,respectively,and2)onethirdto onequarterofgreypearlswasinevitablyharvested,whateverthepolychromaticphenotypechosenasthedonor, which leaves at least half the harvest composed of the attractive green and peacock colours. This preliminary stocklist of colour range together with analysis of the colour phenotype transmission between inner shell and pearl provide the basis for producing multiple pearl oyster “colour lines” through hatchery propagation and would be helpful for future selective breeding programs. Statement of relevance: Donor shell colour selection predict colours of pearls
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Article dans une revue
Aquaculture, Elsevier, 2016, 468, pp.199-205. 〈10.1016/j.aquaculture.2016.10.017〉
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Soumis le : mardi 14 mars 2017 - 12:20:09
Dernière modification le : jeudi 11 janvier 2018 - 06:23:12

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Chin-Long Ky, Cédrik Lo, Serge Planes. Mono- and polychromatic inner shell phenotype diversity in Pinctada margaritifera donor pearl oysters and its relation with cultured pearl colour. Aquaculture, Elsevier, 2016, 468, pp.199-205. 〈10.1016/j.aquaculture.2016.10.017〉. 〈hal-01489247〉

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