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于非非, 钟智明, 牛素芳, 杜晓东, 许开航, 林子腾, 张颖懿, 王家晋, 刘漫玲. 基于线粒体CO序列的南海北部栉江珧遗传多样性分析[J]. 水生生物学报, 2019, 43(3): 494-503. DOI: 10.7541/2019.061
引用本文: 于非非, 钟智明, 牛素芳, 杜晓东, 许开航, 林子腾, 张颖懿, 王家晋, 刘漫玲. 基于线粒体CO序列的南海北部栉江珧遗传多样性分析[J]. 水生生物学报, 2019, 43(3): 494-503. DOI: 10.7541/2019.061
YU Fei-Fei, ZHONG Zhi-Ming, NIU Su-Fang, DU Xiao-Dong, XU Kai-Hang, LIN Zi-Teng, ZHANG Ying-Yi, WANG Jia-Jin, LIU Man-Ling. GENETIC DIVERSITY OF ATRINA PECTINATA FROM THE NORTHERN SOUTH CHINA SEA BASED ON MITOCHONDRIAL DNA CO SEQUENCE[J]. ACTA HYDROBIOLOGICA SINICA, 2019, 43(3): 494-503. DOI: 10.7541/2019.061
Citation: YU Fei-Fei, ZHONG Zhi-Ming, NIU Su-Fang, DU Xiao-Dong, XU Kai-Hang, LIN Zi-Teng, ZHANG Ying-Yi, WANG Jia-Jin, LIU Man-Ling. GENETIC DIVERSITY OF ATRINA PECTINATA FROM THE NORTHERN SOUTH CHINA SEA BASED ON MITOCHONDRIAL DNA CO SEQUENCE[J]. ACTA HYDROBIOLOGICA SINICA, 2019, 43(3): 494-503. DOI: 10.7541/2019.061

基于线粒体CO序列的南海北部栉江珧遗传多样性分析

GENETIC DIVERSITY OF ATRINA PECTINATA FROM THE NORTHERN SOUTH CHINA SEA BASED ON MITOCHONDRIAL DNA CO SEQUENCE

  • 摘要: 为了解南海栉江珧(Atrina pectinata)的群体遗传变异特征, 研究利用线粒体DNA COⅠ(细胞色素氧化酶亚单位Ⅰ)基因部分序列对7个群体共191个栉江珧个体进行群体遗传多样性和遗传结构分析。结果显示: 在600 bp长的序列中, 共检测到113个核苷酸变异位点, 定义了73个单倍型。南海北部栉江珧总体呈现较高的单倍型多样性(0.8996)和较高的核苷酸多样性(0.0257), 但L1组内6个群体(汕头、阳江、湛江、海口、琼海、北海)呈现较高的单倍型多样性(0.8133—0.9286)和较低的核苷酸多样性(0.0033—0.0045)。单倍型系统发育树和网络支系图将7个群体划分为L1和L2(防城港群体)两大类群, 但L1组单倍型并未表现出与地理位置相对应的谱系结构。Fst分析显示, L1组内6个群体间不存在明显的遗传分化(Fst= –0.0200— –0.0055, P>0.05), 但L1组与L2组间存在极显著的遗传分化(Fst=0.8729—0.8821, P<0.01)。L1组的Tajima’s D检验(D= –2.3190, P=0)和Fu’s Fs检验(Fs=–26.8316, P=0)均为显著负值, 核苷酸不配对分布呈明显的单峰分布; L2组的Tajima’s D检验(D=–1.4320, P=0.0565)为不显著负值, Fu’s Fs检验(Fs=4.9540, P=0.9620)为不显著正值。以上数据说明, L1组和L2组栉江珧可能已经分化为两个群体, L1组内6个群体具有频繁的基因交流, 导致了较高的遗传同质性。

     

    Abstract: Atrina pectinata is a commercially important species in the Northern South China Sea. This study analzyed genetic diversity and genetic structure of A. pectinata in Northern South China Sea based on 191 individuals of 7 populations using Cytochrome Oxidase Ⅰ(COⅠ) sequence. A 600bp segment of COⅠ genes were sequenced, from which 113 polymorphic sites were tested and 73 haplotypes were defined. The total population in Northern South China Sea had high haplotype diversity (0.8996) and high nucleotide diversity (0.0257). However, 6 populations in L1 group (ST, YJ, ZJ, HK, QH, BH) had high haplotype diversity (0.8133—0.9286) and low nucleotide diversity (0.0033—0.0045). Based on neighbor-joining tree and haplotype network, 7 populations were classified into two groups, named L1 group and L2 group (FCG), and no clustering corresponding to sampling localities was found in L1 group haplotypes. Fst analysis showed no obvious genetic differentiation among 6 populations in L1 group (Fst= –0.0200— –0.0055, P>0.05) and significant genetic differentiation between L1 group and L2 group (Fst=0.8729—0.8821, P<0.01). Both Tajima’s D (D= –2.3190, P=0) and Fu’s Fs (Fs= –26.7990, P=0) of L1 group yielded significant negative values. Unimodal distribution was observed in L1 group. However, in L2 group, Tajima’s D (D= –1.4320, P=0.0565) was insignificant negative value, and Fu’s Fs (Fs=4.9540, P=0.9620) was insignificant positive value. These data implied L1 group and L2 group might have differentiated into two populations. The frequent gene exchange resulted in high genetic homogeneity among 6 populations in L1 group.

     

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