镜鲤体长性状的QTL定位分析

摘要

A group of F2 hybrids of mirror carp including 68 individuals was used to construct a linkage map using JoinMap4.0 software. Of 560 markers genotyped, 507 markers (143 SSR markers, 33 EST-SSR markers, and 321 SNP markers) were assigned to the map, which comprised of 62 linkage groups. Quantitative traits loci (QTLs) associated with body length were identified by interval mapping of the software MapQTL 5.0. A linkage group wide permutation test (1 000 replicates) determined the significance of the maximum LOD value over the various intervals analyzed for each linkage group. Twelve QTLs were identified for body length on the linkage groups of BL-1-1 (SNP0137-SNP1481), BL-4-1 (SNP0092-HLJ797), BL-5-1 (SNP1268-HLJ423), BL-7-1 (HLJ870-SNP0702), BL-12-1 (SNP0922-HLJ639), BL-16-1 (HLJE351-SNP0674), BL-25-1 (SNP0394-SNP0862), BL-35-1 (HLJ668-SNP0832), BL-43-1 (SNP0389-SNP1425), BL-47-1 (HLJ057-HLJ1113), BL-47-2 (HLJ1439-HLJ14180), which explained 13.8% to 64.9% of the total variation of body length. Eight major QTLs explained over 20% of the phenotypic variation, which were major QTLs associated with the body length of mirror carp.%以镜鲤良种后代为祖父母本所培育的杂交F2群体的68个个体为材料,利用553个分子标记(217个SSR和336个SNP标记)对其进行基因型检测,运用JoinMap4.0软件包对遗传连锁图谱进行构建.利用MapQTL5.0区间作图法(Interval mapping)进行QTL检测,通过置换实验(1000次重复)确定连锁群显著性水平阈值.在对体长的区间定位中共检测到12个与体长性状相关的QTLs区间,分布在BL- 1-1 (SNP0137-SNP1481)、BL-4-1(SNP0092- HLJ797)、BL-5-1 (SNP 1268-HLJ423)、BL-7-1 (HLJ870-SNP0702)、BL-12-1(SNP0922-HLJ639)、BL-16-1(HLJE351- SNP0674)、BL-25-1(SNP0394-SNP0862)、BL-35-1(HLJ668-SNP0832)、BL-43-1(SNP0389-SNP1425)、BL-47-1 (HLJ057-HLJ1113)、BL-47-2(HLJ1439-HLJ1418)等11个连锁群上,解释表型变异范围是13.8％～64.9％,其中贡献率大于20％的主效QTLs有8个,是体长性状的主效QTLs区间.