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

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 trou...

Full description

Saved in:
Bibliographic Details
Published in:The Journal of heredity 2005-03, Vol.96 (2), p.97-107
Main Authors: Perry, G. M. L, Ferguson, M. M, Sakamoto, T, Danzmann, R. G
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0022-1503
1465-7333
DOI:10.1093/jhered/esi019