团头鲂雌核发育后代的微卫星标记分析
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现代农业产业技术体系建设专项(CARS-46-05)、中央高校基本科研业务费专项资金(2011PY023和2011PY043)和海大集团团头鲂育种专项


Microsatellite marker analysis of artificial gynogenetic Megalobrama amblycephala
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    摘要:

    采用松浦镜鲤(Cyprinus carpio Songpu carp)的紫外线遗传灭活精子刺激团头鲂(Megalobrama amblycephala)卵子后冷休克抑制卵子第二极体释放方法,获得团头鲂雌核发育个体。流式细胞仪检测雌核发育个体的DNA含量与正常团头鲂二倍体的DNA含量并没有显著性差异,表明雌核发育个体为二倍体。通过引物优化,筛选父母本具有特异性的8对微卫星引物,对雌核发育后代进行检测,结果表明雌核发育个体的遗传物质均来自母本,没有父本的遗传物质渗入。筛选出母本为杂合的10对微卫星引物对子代的纯合性进行评价,结果显示雌核发育后代在TTF-EST46、TTF-EST61、TTF-EST851位点全部为纯合,而TTF-EST12座位上的重组率为86.4%,其他6个位点的重组率为100%,这10个位点的平均重组率为68.64%。试验结果表明,通过抑制第二极体并不能获得纯合性较高的团头鲂雌核发育个体,但具有与母本较高的遗传同质性,可以作为良好的育种材料使用。

    Abstract:

    Artificial gynogenesis has been proved to be a valuable genetic tool for the rapid production of inbred lines,development of all female populations and construction of linkage map.In the present study,meiogynogenesis of blunt snout bream (Megalobrama amblycephala) was induced by cold-shock with the eggs being activated by UV genetic inactivated sperms of Cyprinus carpio Songpu carp.DNA contents of gynogenetic individuals were measured by flow cytometry and there were no significant differences between gynogenetic individuals and M.amblycephala normal diploids (P>0.05),indicating that the gynogenetic individuals were diploids.Eight pairs of microsatellite primers could amplify clear parental bands were selected to test the gynogenetic progenies.The results of primers MFW1,MFW5 and HLJ393 revealed that no male parent gene exist in gynogenetic individuals.Then ten microsatellites locus where female parent was heterozygous were used to analyze the homozygous ratio of the induced gynogenetic diploids.The results of genetic analysis showed that a high percentage of heterozygosity was found in gynogenetic diploids except for loci TTF-EST46,TTF-EST61 and TTF-EST851.The rate of heterozygosity in meiogynogenetic progenies at the locus TTF-EST12 was 0.864 and the other six loci were 1.000.The average recombination rate of these 10 loci was 0.686 4.This study confirmed that it was difficult to get high rate homozygotic M.amblycephala gynogenesis through suppression of the meiosis-II,because there was high heterozygosity in the first meiogynogenetic generation owing to crossover between the homologous chromosome during the meiosis-I stage.These gynogenetic diploids could be used as breeding material for its high genetic homogeneity with the female parent.

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张新辉,夏新民,罗伟,高泽霞,钱雪桥,王卫民.团头鲂雌核发育后代的微卫星标记分析[J].华中农业大学学报,2012,31(6):737-743

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