ANALYSIS OF THE PYRAMIDING EFFECT OF GROWTH-RELATED MOLECULAR MARKERS IN LARGEMOUTH BASS (MICROPTERUS SALMOIDES)

Growth traits are controlled by multiple genes to cause minor phenotypic effect. To understand the pyra-miding effect of advantage genotypes of growth-related molecular markers in largemouth bass (Micropterus salmoides), thirteen molecular markers related to growth traits were selected obtained on previous studies, which were loca-ted in PCK1, HSBP1, FOXO3b, MYH, HSC70-1, CTSB, HBP, POU1F1, PACAP, IGF-I, ghrelin, ApoproteinA and MSTN. The genotype of each marker in forty largemouth bass parents was analyzed and 2 families were constructed basing on pyramiding advantage genotypes. 305 and 266 individuals were sampled randomly from second filial generation of two families at nine month old, respectively. The results showed that the number of advantage genotypes was various in all offspring of family 1 with the number of individuals of each group 8, 26, 75, 74, 76, 35 and 11, respecti-vely. The average weight of advantage genotypes group was 185.03, 196.46, 198.73, 212.59, 222.66, 235.54 and 261.27 g, respectively. In the offspring of family 2, the number of advantage genotype ranged from one to six with the average weight of 184.43, 213.17, 243.77, 249.98, 252.11 and 266.00 g, respectively. Correlation analysis showed that the pyramiding number of advantage genotype was correlated with growth traits. Our results present evidence to improve the growth trait of largemouth bass by utilizing the limited advantage genotypes. This study provided scientific basis for the application of molecular marker assisted breeding in largemouth bass.