摘要
2002年春季,利用国内现有的海湾扇贝两个不同遗传背景的养殖群体A和B的种贝为材料,采用自体受精和异体受精两种交配策略,建立了海湾扇贝的自交系和杂交系。实验由AA(A♀×A♂)、BB(B♀×B♂)、AB(A♀×B♂)、BA(B♀×A♂)四个组组成。杂交使两个表型性状———生长和存活都得到了改良。就生长而言,杂交组比自交组快,杂种优势在幼虫期为35.34%、养成阶段为21.17%;杂交组AB的生长速度比自交组AA的提高了35.53%(幼虫期)和43.32%(养成阶段),杂交组BA的生长速度比自交组BB的提高了35.13%(幼虫期)和12.34%(养成阶段)。就存活而言,两个杂交组的存活率都高于相应的自交组,杂种优势的平均值在幼虫期为19.93%,养成阶段为31.46%;杂交组AB的存活率比自交组AA的提高了25.23%(幼虫期)和49.44%(养成阶段),杂交组BA的存活率比自交组BB的提高了12.36%(幼虫期)和21.29%(养成阶段)。A、B两个群体间存在的遗传差异是它们能够获得杂种优势和性状得到改良的基础。
Hybridized families of bay scallop Argopecten irrandians irradians between Stock A and Stock B, which are separated from each other were established by using the pair mating and self-fertilized families were used as control groups at the spring of 2002. The experiments consisted of AA (A♀×A♂), BB(B♀×B♂), AB(A♀×B♂) and BA (B♀×A♂) groups. Heterosis is very clear. Growth and survival of the hybrid progeny are both improved. Considering growth, heterosis is 35.34 % at larvae stage and 21.17 % during grow out, respectively. The growth rate of the cross compared with the self-fertilized was improved 35.53 % for AB and 35.13 % for BA at larvae stage, and which was 43.32 % for AB and 12.34 % for BA during grow out. Considering survival, heterosis is 35.17 % at larvae stage and 12.34 % during grow out, respectively. The survival percentage of the cross compared with the self-fertilized was improved 25.23 % for AB and 12.36 % for BA at larvae stage, and which was improved 49.44 % for AB and 21.29 % for BA during grow out. The genetic difference between Stock A and Stock B may be the success fundament of genetic improvement.
出处
《水产学报》
CAS
CSCD
北大核心
2004年第3期267-272,共6页
Journal of Fisheries of China
基金
中国科学院知识创新工程资助项目(ZKCX2-11)
关键词
海湾扇贝
家系
杂交
自交
杂种优势
Argopecten irradians irradians
family, hybridization, self-fertilization, heterosis
