Genotype-by-environment interaction for resistance to Edwardsiella tarda under different temperatures in turbot
Edwardsiellosis caused by Edwardsiella tarda is recognized as one of the most serious bacterial diseases affecting farmed turbot. The occurrence of this disease in actual farming was often accompanied by high water temperatures. To determine whether the genotype-environment interaction (G×E) under d...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Aquaculture Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352513425003837 |
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| Summary: | Edwardsiellosis caused by Edwardsiella tarda is recognized as one of the most serious bacterial diseases affecting farmed turbot. The occurrence of this disease in actual farming was often accompanied by high water temperatures. To determine whether the genotype-environment interaction (G×E) under different temperatures will limit the realization of genetic gains from selection breeding in practical aquaculture processes, we tested turbot's resistance to E. tarda at both high (21℃) and low (16℃) temperatures, and investigated the G×E for this trait under different temperatures. The mortality under high temperature occurred from 6 to 14 days post infection, while that under low temperature occurred from 11 to 23 days post infection. Using survival days post-infection as the phenotype for resistance to E. tarda, the estimated heritability under high and low water temperatures were 0.16 ± 0.06 and 0.54 ± 0.11, respectively. The phenotypic and genetic correlations between them were 0.11 ± 0.07 and 0.37 ± 0.22, respectively. These results suggested that there were an obvious scaling effect and a severe re-ranking effect for resistance to E. tarda in turbot between low and high temperatures. Based on this, we believe that G×E under different temperatures is likely to result in a low genetic correlation between resistance to E. tarda in the case of artificial infection and commercial farming. Therefore, it is necessary to utilize the disease outbreak temperatures in commercial aquaculture environments (19–23°C) as the primary selection environment for E. tarda resistance breeding. |
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| ISSN: | 2352-5134 |