Supajit Sraphet. Development of AFLP genetic markers for growth trait of black tiger shrimp (Penaeus monodon) . Master's Degree(Molecular Genetics and Genetic Engineering). Mahidol University. : Mahidol University, 2004.
Development of AFLP genetic markers for growth trait of black tiger shrimp (Penaeus monodon)
Abstract:
Although Penaeus monodon is the most economically important shrimp species in Thailand, broodstock selection is limited: molecular biology and genetics seem to be a promising method to overcome the problem. The objectives of this study were to develop AFLP markers specific to the growth trait of the P. monodon and to convert all identified AFLP markers to SCAR markers. A total of 101 primer combinations of EcoRI-CNN or TNN and MseI-CNN were used to screen 151 day old shrimp which were classified into 4 different groups according to their weight and sex. A total of 25 AFLP markers were identified from 20 primer pairs. Of these, 16 markers were specific to the growth trait, while the other 3 markers were specific to male sex and 6 markers were specific to female sex. All polymorphic AFLP bands were converted to SCAR markers. The SCAR primers were tested against pooled and individual genomic DNAs. The results showed that one SCAR marker designated SF-E51M29 was identified with a polymorphism specific to the fast-growing trait with about 83% accuracy of phenotype prediction. The differences among polymorphic bands of the SF-E51M29 were due to insertion/deletions of nucleotides within the amplified region. Moreover, the SF-E20M24 showed the polymorphism specific to the fast growing trait with about 83% accuracy of phenotype prediction after testing with individual pre-amplified products. The PCR products from the rest of the SCAR primers showed no polymorphism even after further analysis using the Single Strand Conformational Polymorphism (SSCP) technique. However, the AFLP markers that were not converted to SCARs will be used in the construction of a genetic linkage map and the SF-E51M29 and SF-E20M24 markers will be useful for a marker assisted selection program of fast-growing P. monodon