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OALib Journal期刊
ISSN: 2333-9721
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基于线粒体dna细胞色素b序列分析3个条纹斑竹鲨群体的遗传结构和遗传分化
Keywords: 条纹斑竹鲨chiloscylliumplagiosum,线粒体,细胞色素b,群体遗传
Abstract:
？测定和分析了广东、福建、海南3个不同地理群体共71尾条纹斑竹鲨chiloscylliumplagiosum的线粒体细胞色素b(mtdnacytb)全序列。结果表明,条纹斑竹鲨cytb基因全长1146bp,具15个单倍型。较低的核苷酸多样性(π=0.00254)及单倍型多样性(h=0.7195)提示条纹斑竹鲨线粒体dna的进化速率较慢。各群体内的tajima’sd检验的结果均不显著(p>0.10),表明各群体进化过程中未出现扩张和持续增长,群体大小维持稳定。nj树和单倍型网络图结果表明较早出现的是广东群体,福建群体较晚出现。通过计算其遗传距离值、估算其基因流(nm)及进行amova分析,均显示福建群体与海南和广东群体的分化最远,而海南及广东群体间分化不明显。研究表明距离隔离是条纹斑竹鲨福建、广东和海南群体遗传分化的重要因素。
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