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采用来自韩国野生的栉孔扇贝和中国养殖的栉孔扇贝以及发病区存活个体作为亲本 ,构建韩国野生×韩国野生、韩国野生×中国养殖、韩国野生×中国养殖发病区存活个体以及中国养殖×中国养殖共 4个交配组合 ,通过对F1 代个体壳宽、壳高和体重的测量 ,比较不同群体的生长情况。同时采用RAPD技术对F1 代不同群体的遗传结构进行比较 ,研究群体内的遗传变异与杂种优势的关系。结果表明 ,杂交后代具有明显的生长优势 ,说明栉孔扇贝种内不同种群之间存在杂种优势。韩国野生种群和中国养殖群体以及发病区存活群体的遗传距离分别为 0 0 3 6 6和 0 0 0 5 7,以上 4个F1 代群体的平均杂合度的理论值分别为 0 2 83、0 2 6 7、0 2 6 8和 0 2 6 6 ;多态位点比例分别为 0 76 5、0 76 0、0 76 0、0 73 5。表明栉孔扇贝不同地理种群之间存在遗传分化 ,其杂种优势与群体的遗传多样性相关
South China wild × Korean wild × South Korean wild × Chinese breed × Korean wild × × Chinese breed × Scirpus × Chinese Breeding a total of 4 mating combinations, F1 generation by individual shell width, shell height and weight measurements, compared to different groups of growth. At the same time, the genetic structure of different F1 populations was compared by RAPD to study the relationship between genetic variation and heterosis in the population. The results showed that the hybrid progeny had obvious growth advantages, indicating that there is heterosis among different populations in Scallop. The genetic distances between wild populations in South China and those in China and those in the endemic areas were 0 0 3 6 6 and 0 0 0 5 7, respectively. The theoretical average heterozygosity for these 4 F1 populations was 0 2 83,0 2 6 7,0 2 6 8 and 0 2 6 6 respectively. The percentage of polymorphic loci was 0 76 5,0 76 0,0 76 0,0 73 5 respectively. Indicating that there is genetic differentiation among different geographic populations of Chlamys farreri, and its heterosis is related to the genetic diversity of the population