Dernière mise à jour le : 20 janvier 2012

Responses of Pacific oyster Crassostrea gigas populations to abiotic stress in environmentally contrasted estuaries along the Atlantic coast of France

DESCRIPTION

Genetic and ecophysiological responses of oyster, Crassostrea gigas, populations to environmental stress were investigated in three highly contaminated French estuaries (the Gironde, Loire and Vilaine) and compared to a control, the Belon estuary. A strong response in both metallothionein CgMT4 mRNA expression, as determined by semi-quantitative RT-PCR, and amount of protein, as determined by ELISA tests, was demonstrated in estuarine populations subjected to differential contamination, with an inhibition in the area most highly contaminated with metals. In these same estuarine populations, we found polymorphisms of the metallothionein CgMT4 gene and three other genes (glutamine synthetase - GS, delta-9 desaturase - D9 and phosphoglucomutase - PGM) involved in stress response of C. gigas. We showed that genetic differentiation was observed for MT4 and PGM genes in the Gironde estuary which is highly contaminated with metals. A strong seasonal effect was observed. Phenotype-genotype coupling revealed that one particular MT4 allele and one PGM allele seemed to be associated with metal sensitivity expressed as lower detoxification efficiency and higher metal bioaccumulation. The MT4 gene is a good physiological and genetic marker of stress response and susceptibility.

NOTICE BIBLIOGRAPHIQUE DETAILLÉE

keyboard_arrow_right Titre : Responses of Pacific oyster Crassostrea gigas populations to abiotic stress in environmentally contrasted estuaries along the Atlantic coast of France
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : MORAGA, Dario , LAROCHE, Jean , Quiniou, Louis , Riso, Ricardo , TANGUY, Arnaud , David, Elise
keyboard_arrow_right Date de publication : 20 janvier 2012
keyboard_arrow_right Editeur(s) : s. n.
keyboard_arrow_right Tags thématiques : biologie, mollusque
keyboard_arrow_right Mots-clés libres : Huître creuse
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right Collection : Aquatic Toxicology
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