DNA条形码在鰤属鱼类物种鉴定和系统进化分析中的适用性
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王开杰(1994–),男,硕士研究生,研究方向为鱼类多样性评价与保护技术.E-mail:jasions@qq.com

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S961

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国家重点研发计划项目(2019YFD0900901, 2018YFD0901204); 山东省支持青岛海洋科学与技术试点国家实验室重大科技专项(2018SDKJ0303-1); 中国水产科学研究院基本科研业务费项目(TD47, 2021GH05); 中国水产科学研究院黄海水产研究所基本科研业务费项目(20603022021011); 国家海洋水产种质资源库项目; 财政部和农业农村部国家现代农业产业技术体系项目(CARS-47).


Species identification and phylogenetic relationships in Seriola based on DNA barcoding
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    摘要:

    为了探讨线粒体细胞色素 C 氧化酶亚基 I,II (CO I,CO II)和 1 6.S rRNA 基因在鰤属鱼类物种鉴定和群体划分中的适用性,在黄条鰤(Seriola lalandi),髙体鰤(Seriola dumerili),五条鰤(Seriola quinqueradiata)等鰤属鱼类中克隆了 3.种基因,并进行序列比对与系统进化分析。结果显示,CO I,CO II 和 1 6.S rRNA 的基因序列均表现出明显的 A+T 偏倚性 ; 1 6.S rRNA 序列最为保守,变异率仅为 5.06% ; CO I 序列的平均核苷酸差异数(k)和核酸多样性指数(Pi)高于 CO II 和 1 6.S rRNA,CO II 的单倍型多样性指数最高,CO I 序列分化程度更高。比较了鰤属鱼类 3.种基因的扩增序列,发现 CO I,CO II 和 1 6.S rRNA 均能对我国分布的 3.种鰤属鱼类进行有效鉴别。另外,CO I,CO II 还可作为不同地理群体黄条鰤的鉴别 DNA 条形码,而 1 6.S rRNA 对于不同地理群体的黄条鰤辨识能力不足。在鰤属鱼类中,基于 CO I,CO II1 6.S rRNA 基因计算的种间遗传距离都大于种内遗传距离的 1 0.倍以上,系统进化分析显示每个物种都形成单系,表明 CO I,CO II1 6.S rRNA 基因不仅可作为鰤属鱼类物种鉴定和多样性保护的有效 DNA条形码,CO I,CO II 还可作为黄条鰤不同地理种群划分和国际资源判别的依据。

    Abstract:

    Seriola has three species that are highly similar morphologically and are difficult to distinguish. Therefore, it is necessary to distinguish them by molecular biology methods. In this study, we explored the applicability of cytochrome oxidase subunit I (CO I), cytochrome oxidase subunit II (CO II), and 16S rRNA in identification and evolutionary analysis of the three species of Seriola, namely, S. lalandi (Chinese, Australian and Japanese populations), S. dumerili, and S. quinqueradiata. Three pairs of primers were designed for PCR amplification and sequencing of CO I, CO II, and 16S rRNA sequences of the three Seriola species. Dnasp5.10 and Mega7.0 software were used for DNA sequencing, genetic difference analysis, and phylogenetic tree analysis. The results showed that the CO I, CO II, and 16S rRNA sequences had a significant A+T bias. The mitochondrial 16S rRNA sequence was the most conservative, with a variation rate of 5.06%. The average number of nucleotide differences (k) and nucleotide diversity (Pi) according to the CO I sequence were higher than those of CO II and 16S rRNA. CO II had the highest haplotype diversity index among the three genes, indicating its high genetic diversity. The CO I sequence had higher differentiation and more abundant genetic resources than the 16S rRNA and CO II sequences. Thus, CO I and CO II sequences could be used to identify the three Seriola species in China and effectively identify the populations of S. lalandi from the three different waters (Northeast, Northwest and South Pacific waters). In the Seriola species, the interspecific genetic distances of CO I and CO II were more than 10 times the intraspecific genetic distances. The phylogenetic tree analysis showed that each species had independent branches. S. lalandi and S. quinqueradiata had a closer relationship than the others in the tree. The phylogenetic tree constructed using the three gene sequences could reflect the evolutionary relationship among the species. These results indicated that CO I and CO II gene sequences could be used as effective DNA barcodes for species identification and population division of Seriola species and provide efficient molecular tools for classification identification, resource screening, and diversity protection.

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王开杰,徐永江,柳学周,崔爱君,姜燕,王滨,方璐. DNA条形码在鰤属鱼类物种鉴定和系统进化分析中的适用性[J].中国水产科学,2022,29(2):171-183
WANG Kaijie, XU Yongjiang, LIU Xuezhou, CUI Aijun, JIANG Yan, WANG Bin, FANG Lu. Species identification and phylogenetic relationships in Seriola based on DNA barcoding[J]. Journal of Fishery Sciences of China,2022,29(2):171-183

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  • 在线发布日期: 2022-02-27
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