tailieunhanh - Báo cáo sinh học: " Mapping of quantitative trait loci for flesh colour and growth traits in Atlantic salmon (Salmo salar)"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài: Mapping of quantitative trait loci for flesh colour and growth traits in Atlantic salmon (Salmo salar) | Baranski et al. Genetics Selection Evolution 2010 42 17 http content 42 1 17 Ge n et i cs Selection Evolution RESEARCH Open Access Mapping of quantitative trait loci for flesh colour and growth traits in Atlantic salmon Salmo salar Matthew Baranski 1 3 Thomas Moen1 3 4 and Dag IngeVâge2 3 Abstract Background Flesh colour and growth related traits in salmonids are both commercially important and of great interest from a physiological and evolutionary perspective. The aim of this study was to identify quantitative trait loci QTL affecting flesh colour and growth related traits in an F2 population derived from an isolated landlocked wild population in Norway Byglands Bleke and a commercial production population. Methods One hundred and twenty-eight informative microsatellite loci distributed across all 29 linkage groups in Atlantic salmon were genotyped in individuals from four F2 families that were selected from the ends of the flesh colour distribution. Genotyping of 23 additional loci and two additional families was performed on a number of linkage groups harbouring putative QTL. QTL analysis was performed using a line-cross model assuming fixation of alternate QTL alleles and a half-sib model with no assumptions about the number and frequency of QTL alleles in the founder populations. Results A moderate to strong phenotypic correlation was found between colour length and weight traits. In total 13 genome-wide significant QTL were detected for all traits using the line-cross model including three genome-wide significant QTL for flesh colour Chr 6 Chr 26 and Chr 4 . In addition 32 suggestive QTL were detected chromosomewide P . Using the half-sib model six genome-wide significant QTL were detected for all traits including two for flesh colour Chr 26 and Chr 4 and 41 suggestive QTL were detected chromosome-wide P . Based on the half-sib analysis these two genome-wide significant QTL for flesh colour explained 24 of the phenotypic variance

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