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Pages: 1146-1152
Year: Issue:  5
Journal: Oceanologia et Limnologia Sinica

Keyword:  razor clam Sinonovacula constrictaEST-SSR markergrowth traitcorrelation analysis;
Abstract: We analyzed the genetic diversity and screened the markers associated with growth traits using 16 polymorphic microsatellite markers in an F1 family of razor clam Sinonovacula constricta. Thirty-nine alleles were detected, and the average number of alleles and effective number of alleles were 2.44 and 2.09, respectively. The mean polymorphism information content(PIC) was 0.40. The average observed heterozygosity(Ho) and expected heterozygosity(He) were 0.58 and 0.63, respectively. The genotype distribution of partly loci deviated severely from Mendel’s Laws, suggesting that these loci might link with the adaptive gene, and locus YC-8 may link with heterozygous lethal genes. Loci YC-96 and YC-123 showed significant impact on shell weight(P<0.05). Genotypes BC at YC-96 and BB at YC-123 were favorable for shell weight, featuring highest phenotype value in shell weight, length, width, and height, respectively; and therefore can be used as molecular markers in selection breeding. Locus YC-1 showed a significant impact on shell width(P<0.05), in which BB was a dominant genotype of shell width. Locus YC-93 showed an extremely significant effect on shell width and shell height(P<0.01), in which AB was the dominant genotype of shell height, and BB and BC were the dominant genotypes of shell width. The best genotype combinations(BB/BB(BC)/BC/BB) for YC-1, YC-93, YC-96 and YC-123 were selected for body weight, which conforms to the additive model.
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