Journal
AQUACULTURE
Volume 277, Issue 3-4, Pages 156-163Publisher
ELSEVIER
DOI: 10.1016/j.aquaculture.2008.03.001
Keywords
IHNV resistance; rainbow trout; Oncorhynchus mykiss; cutthroat trout; Oncorhynchus clarki bouvieri; QTL
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Infectious hematopoietic necrosis virus (IHNV) is a major constraint to rainbow trout culture. Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri) have greater resistance to this virus than do rainbow trout (O. mykiss), but the genetic mechanism of this resistance is not understood. We conducted a genome scan using a backcross of cutthroat trout into a rainbow trout background to estimate the number and locations of quantitative trait loci (QTL) associated with IHNV resistance and growth in trout. IHNV resistance was considered in terms of both survival (binary trait) and days to death (quantitative trait). The genetic map was scanned using interval mapping via two different approaches: one model considered survival alone and a second two-part model combined both survival and days to death. Three QTL were significantly (P <= 0.05) associated with virus resistance genome-wide, explaining 32.5% of the phenotypic variation. Cutthroat alleles at two of these QTL resulted in increased resistance to the pathogen, as expected. No growth QTL were detected in this cross. We suggest that these traits are genetically independent. (C) 2008 Elsevier B.V. All rights reserved.
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