Influence of Temperature and Pearl Rotation on Biomineralization in the Pearl Oyster Pinctada margaritifera

Type Article
Date 2018-09
Language English
Author(s) Le Moullac GillesORCID1, Schuck Lucie1, Chabrier Sebastien2, Belliard Corinne1, Lyonnard Pierre1, Broustal Floriane1, Soyez Claude1, Saulnier Denis1, Brahmi Chloe3, Ky Chin-Long1, Beliaeff Benoit1
Affiliation(s) 1 : Ifremer, UMR EIO 241, Labex Corail, Ctr Pacifique, BP 49, F-98719 Tahiti, French Polynesi, France.
2 : Univ Polynesie Francaise, Lab GEPASUD, BP 6570, F-98702 Faaa, French Polynesi, Fr Polynesia.
3 : Univ Polynesie Francaise, UMR EIO 241, Labex Corail, BP 6570, F-98702 Faaa, French Polynesi, Fr Polynesia.
Source Journal Of Experimental Biology (0022-0949) (Company Biologists Ltd), 2018-09 , Vol. 221 , N. 18 , P. jeb186858 (7p.)
DOI 10.1242/jeb.186858
WOS© Times Cited 1
Keyword(s) Magnetometer, Rotation speed, Nacre growth, Nacre thickness, Gene expression, Pmarg-Pif177
Abstract

The objective of this study was to observe the impact of temperature on pearl formation using  an integrative approach describing the rotation of the pearls, the rate of nacre deposition, the  thickness of the aragonite tablets and the biomineralizing potential of the pearl sac tissue  though the expression level of some key genes. Fifty pearl oysters were grafted with  magnetized nuclei to allow the rotation of the pearls to be described. Four months later, 32 of  these pearl oysters were exposed to four temperatures (22, 26, 30 and 34°C) for 2 weeks.  Results showed that the rotation speed differed according to the movement direction: pearls  with axial movement (AM) had a significantly higher rotation speed than those with random  movement (RM). Pearl growth rate was influenced by temperature, with a maximum between  26 and 30°C but almost no growth at 34°C. Lastly, among the nine genes implicated in the  biomineralization process, the Pmarg-Pif177 expression was significantly modified by  temperature. These results showed that the rotation speed of the pearls was not linked to  pearl growth or to the expression profiles of biomineralizing genes targeted in this study. On  the basis of our results, we consider that pearl rotation is a more complex process than  formerly thought. Mechanisms involved could include a strong environmental forcing in  immediate proximity to the pearl. Another implication of our findings is that, in the context of  ocean warming, pearl growth and quality can be expected to decrease in pearl oysters  exposed to temperatures above 30°C.

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Le Moullac Gilles, Schuck Lucie, Chabrier Sebastien, Belliard Corinne, Lyonnard Pierre, Broustal Floriane, Soyez Claude, Saulnier Denis, Brahmi Chloe, Ky Chin-Long, Beliaeff Benoit (2018). Influence of Temperature and Pearl Rotation on Biomineralization in the Pearl Oyster Pinctada margaritifera. Journal Of Experimental Biology, 221(18), jeb186858 (7p.). Publisher's official version : https://doi.org/10.1242/jeb.186858 , Open Access version : https://archimer.ifremer.fr/doc/00450/56196/