QTL associated with WSSV-resistance and growth-related traits in the Chinese shrimp Fenneropenaeus chinensis

A virgin female Chinese shrimp Fenneropenaeus chinensis was selected from the fourth generation of a successively WSSV(White Spot Syndrome Virus) resistance population and mated with a wild male through artificial insemination to produce the F1 and F2 generation. These shrimp were challenged with WSSV and the F2 generation were collected and scored for WSSV resistance, standard length, total body length and body weight. AFLP (Amplified Fragment Length Polymorphism) markers were used to construct a linkage map of F.chinensis based on this F2 family. The MAPMAKER/QTL1.1 software was applied in QTL (Quantitative Traits Loci) mapping of standard length, total body length, weight and WSSV-resistant of F.chinensis based on interval mapping method (IM). At the criterion of LOD (Limit of Detection) >2.0, one QTL associated with standard length, two with total body length, two with body weight and two with WSSV-resistance were detected. These QTL were distributed on three linkage groups. The variance-explained value of QTLs were between 26.6% and 66.9%. Three QTL for body weight, total body length and WSSV-resistance were detected on LG11, two QTLs for standard length and total body length shared a same LG (Linkage Group), and two QTL of WSSV-resistance and body weight were distributed on another LG. These results suggested that the WSSV-resistance and the body shape traits of F.chinensis are correlated[Acta Zoologica Sinica 54(6): 1075 – 1081, 2008].