First evaluation of resistance to both a California OsHV-1 variant and a French OsHV-1 microvariant in Pacific oysters ...

• Main Authors: Divilov, Konstantin, Schoolfield, Blaine, Morga, Benjamin, Dégremont, Lionel, Burge, Colleen A., Cortez, Daniel Mancilla, Friedman, Carolyn S., Fleener, Gary B., Dumbauld, Brett R., Langdon, Chris
• Format: Article in Journal/Newspaper
• Language: English
• Published: BioMed Central 2019
• Subjects: Pacific; Pacific oyster
• Online Access: https://dx.doi.org/10.13016/m2vjkq-wudw; http://mdsoar.org/handle/11603/17231

Background: Variants of the Ostreid herpesvirus 1 (OsHV-1) cause high losses of Pacific oysters globally, including in Tomales Bay, California, USA. A suite of new variants, the OsHV-1 microvariants (μvars), cause very high mortalities of Pacific oysters in major oyster-growing regions outside of the United States. There are currently no known Pacific oysters in the United States that are resistant to OsHV-1 as resistance has yet to be evaluated in these oysters. As part of an effort to begin genetic selection for resistance to OsHV-1, 71 families from the Molluscan Broodstock Program, a US West Coast Pacific oyster breeding program, were screened for survival after exposure to OsHV-1 in Tomales Bay. They were also tested in a quarantine laboratory in France where they were exposed to a French OsHV-1 microvariant using a plate assay, with survival recorded from three to seven days post-infection. Results: Significant heritability for survival were found for all time points in the plate assay and in the ...