ABSTRACT
: Mitochondrial DNA restriction fragment length polymorphism (mtDNA-RFLP) was utilized for determination of genetic variation and population structure in Penaeus monodon collected from Satun (the Andaman Sea) and Surat and Trat (the Gulf of Thailand). Twenty-eight composite haplotypes were generated from 52 restriction profiles of P. monodon mtDNA digested with 11 restriction endonucleases. The size of the entire P. monodon mitochondrial genome was estimated to be 15.913 +/- 0.177 kb. The average haplotype diversity in P. monodon was 0.864, whereas the mean nucleotide diversity within populations was 2.51%, 2.22%, and 1.91% for Satun, Trat, and Surat, respectively. Geographic heterogeneity analysis indicated population differentiation between P. monodon from the Andaman Sea and P. monodon from the Gulf of Thailand (p <.0001). On the basis of the high genetic diversity level of P. monodon in Thailand, the Satun and Trat P. monodon populations from the west and east of the pennisula were selected to be founder stocks in our selective breeding program.
ABSTRACT
The preliminary study of rDNA polymorphisms in P. monodon showed that inter- and intraindividual polymorphisms of rDNA were clearly observed in this species. Individual-specific rDNA restriction patterns were observed when digested with BamHI and SacI. The intergenic spacers (IGS) region of P. monodon rDNA plays an important role in length heteroplasmy at both between- and within-individual levels in this species.
