温度、盐度对海湾扇贝(Argopecten irradians)南北亚种回交幼虫生长和存活的影响

The effects of temperature, salinity on larval growth and survival of Argopecten irradians backcrosses

开展了海湾扇贝南北亚种杂交子代同海湾扇贝北方亚种间回交、杂交子二代及北方亚种对照组等群体的基因型和温度、盐度等环境因素之间的互作研究。研究结果表明,杂种F2和回交组别相对纯种组别存在生长优势。温度和盐度均对不同基因型群体的生产和存活产生显著的影响,其中在逆境温度下杂种F2和回交组能够更加适应并表现出更高的生长优势,而在盐度中结果却并非如此,这表明基因型和环境之间的互作机制比较复杂。研究结果为继续在不同海区环境下开展海湾扇贝回交育种提供了积极的理论依据和实践参考。

The independent and interactive effects of genotype and environmental factors on survival and growth at larvae stage were studied by rearing four distinctly genotypic larvae including two backcross groups,one F2 hybrid group and one purebred group from inter-and intra-crosses of A.i.irradians and F1 hybrid(A.i.irradians and A.i.concentricus)under the different temperatures and salinities.Backcross groups or F2 hybrid group were found have a significant advantage over the purebred group in larval growth(P<0.05).Larval survival and growth was significantly affected not only by genotype and temperature or salinity,but also by their interaction.More growth advantage for survival and growth was examined under higher or lower temperature environmental condition,which indicated that hybrid is more fit to inverse temperature than purebred.But the reverse results were found in the salinity test,which may implicate the unknown complicated mechanism of the interaction between genotype and environmental factors.The study might give constructive feedback for the bay scallop backcross breeding and the development of scallop industry.