Abstract：Growth traits of pearl oyster(Pinctada martensii) is quantitative traits. Genetic diversity of 90 individuals sampled from the fourth generation selected line of pearl oyster were evaluated by 50 EST-SSR markers, and then a correlation analysis between the markers and total weight, shell length, shell height and shell width of the selected line was performed using a GLM model of SPSS 16.0 software. The results found that total of 204 alleles were detected and the number of alleles(Ne) were between 2~9 at each locus, with 4.080 number of alleles on average. The effective number of alleles(Na) was 2.574. The mean values of observed heterozygosity(Ho), expected heterozygosity(He) and polymorphism information content (PIC) were 0.534, 0.543 and 0.491, respectively. Totally, 15 loci were significantly related with the growth traits (P<0.05). There were 7 loci significantly related with total weight (P<0.05), 6 loci significantly related with shell length (P<0.05), 6 loci significantly related with shell height (P<0.05) and 4 loci significantly related with shell width (P<0.05). Favorable genotypes for each growth traits were obtained by a multiple comparison among the loci. The correlation obtained in this study between growth trait and EST-SSR markers is benefit to further study in the marker assisted breeding of this species.
