DOI: 10.3724/SP.J.1231.2010.06624

Journal of Fisheries of China (水产学报) 2010/34:4 PP.500-507

Genetic structure and genetic diversity analysis of four consecutive breeding generations of large yellow croaker (Pseudosciaena crocea) using microsatellite markers

Thirteen microsatellite markers were used to analyze the genetic structure and genetic diversity of the breeding populations “Guanjingyang Youkuai 01” from F1 to F4. The results showed that the genetic diversity of the breeding population was decreasing, the average polymorphism information content (PIC) of the 13 microsatellite markers decreased from 0.638 to 0.524, the average allele number from 5.462 to 4.308, the average heterozygosity from 0.779 to 0.532, and the average Shannon’s gene diversity index from 1.356 to 1.092, respectively. The genetic identity between F1 and its descendant generations (F2, F3, F4) decreased (from 0.719 4 to 0.581 3) while the genetic distance increased. The genetic identity between the adjacent generations increased and the FST values decreased (0.061 9 in F1-F2; 0.051 1 in F2-F3; 0.047 5 in F3-F4). The allele frequency of the loci LYC0002 and LYC0054 changed regularly in the four breeding generations and they might correlate with the selected traits, which should be proved by further research. Our study suggested that the selective breeding work was efficient, some adverse genes were phased out, the hereditary basis of the population was getting pure and the genetic structure would be stable with the continuation of the breeding work.

Key words:Pseudosciaena crocea,microsatellite,genetic diversity,genetic structure,selective breeding population

ReleaseDate:2014-07-21 15:27:38

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