机构地区: 中国水产科学研究院黑龙江水产研究所
出 处: 《遗传》 2010年第3期248-253,共6页
摘 要: 鱼类的耐低温性状是一种重要的经济性状。为了初步分析大黄鱼的耐低温性状,文章采用15对荧光微卫星标记,以SSR-PCR方法对大黄鱼低温耐受组和正常对照组F1代共40个个体进行了耐低温性状遗传差异分析。结果显示,标记LYC0002在两组样品中共扩增出5个等位基因(片段大小分别为112bp、110bp、108bp、106bp和104bp),其中LYC0002112bp等位基因在低温耐受组的出现频率达60%,而在正常对照组中的频率为零,表明该等位基因对大黄鱼的温度敏感特性有较明显的偏好性,可能与某种耐低温基因存在一定的连锁关系。此外,对LYC0002106bp、LYC0002108bp、LYC0002110bp和LYC0002112bp4个等位基因分别进行了回收、克隆及测序。序列比对结果显示,LYC0002112bp等位基因含有10个(CA)重复单元,而其他3个等位基因依次缺失1个(CA)重复单元,说明LYC0002在本研究样本中的突变方式为微卫星逐步突变模型(Stepwise mutation model,SMM)。 Cold tolerance is one of the major economic characters in fish.In order to discuss the cold tolerance of large yellow croaker (Pseudosciaena crocea R.),fifteen fluorescent dye-labeled microsatellite markers were applied to detect genetic differences between F1 offsprings of cold tolerance group and normal group of large yellow croaker by SSR-PCR.Each group contained 20 randomly and separately sampled individuals.As a result,marker LYC0002 five alleles (LYC0002104 bp,LYC0002106 bp,LYC0002108 bp,LYC0002110 bp,and LYC0002112 bp) were amplified with marker LYC0002 in both groups and 60% (12/20) of individuals had allele LYC0002112 bp in cold tolerance group exclusively,which indicated that this allele is probably sensitive to temperature and associated with gene for cold tolerance.In addition,four alleles (LYC0002106 bp,LYC0002108 bp,LYC0002110 bp,and LYC0002112 bp) were sequenced individually.Sequence alignments showed that LYC0002112 bp allele contains 10 (CA) repeats,the remaining three alleles lacked one (CA) one by one,corresponding to the stepwise mutation model (SMM) of microsatellite.
领 域: [农业科学]