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Journal of Heredity Advance Access published online on January 13, 2005
Journal of Heredity, doi:10.1093/jhered/esi019
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© 2005 The American Genetic Association
Received April 2, 2003
Accepted August 15, 2004

Article

Sex-linked Quantitative Trait Loci for Thermotolerance and Length in the Rainbow Trout

G. M. L. Perry 1*, M. M. Ferguson 2, T. Sakamoto 3, and R. G. Danzmann 2

1 From the Groupe interuniversitaire de recherches océanographiques du Québec (GIROQ), Département de biologie, Université Laval, Ste-Foy, Québec G1K 7P4, Canada
2 From the Groupe interuniversitaire de recherches océanographiques du Québec (GIROQ), Department of Zoology, University of Guelph, Guelph, Ontario N1G 2W1, Canada
3 From the Groupe interuniversitaire de recherches océanographiques du Québec (GIROQ), Tokyo University of Marine Science and Technology, Faculty of Marine Science, Department of Marine Biosciences, 4-5-7, Konan, Minato, Tokyo 108-0075, Japan

* To whom correspondence should be addressed.
G. M. L. Perry, E-mail: guy.perry{at}giroq.ulaval.ca


  Abstract

We hypothesized that correlation between growth traits and upper thermal tolerance (UTT) in rainbow trout (Oncorhynchus mykiss) might be explained by quantitative trait loci (QTL) localized to the same linkage groups. Microsatellites on three autosomal linkage groups carrying UTT QTL in rainbow trout were tested for associations with fork length (FL) and condition factor (K) in half-sib families of outbred rainbow trout and in backcrosses of trout lines selected on UTT. Additionally, we used a sex-linked microsatellite (OmyFGT19TUF) to test for marker-trait associations at the sex chromosomes. The sex-linked marker OmyFGT19TUF was significantly associated with FL and UTT, accounting for up to 9.6% and 9.7% of variance in these traits, respectively. Male advantages in FL (and, to a lesser extent, UTT) relative to their female sibs were dependent on the origin of the Y chromosome and thus varied among grandsire lines. However, males had higher K in a manner unrelated to Y chromosomal origin, suggesting a partially sex-limited expression of this trait. Omy325UoG was significantly associated with K in one of the outbred half-sib families, but no other significant autosomal marker-trait associations were detected. Our findings illustrate minor evidence that correlation between UTT and FL is partially determined by one or more sex-chromosomal QTL.


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