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基于线粒体控制区Dloop序列的长臀种群遗传结构分析

2016-02-23谢少林吕子君李正光石忍耐邹记兴

华南农业大学学报 2016年1期

谢少林, 王 超,, 吕子君, 李正光, 石忍耐, 邹记兴

(1 华南农业大学 动物科学学院,广东 广州 510642; 2 清远市兴渔水产科技有限公司,广东 清远 511510)



谢少林1, 王超1,2, 吕子君1, 李正光1, 石忍耐2, 邹记兴1

(1 华南农业大学 动物科学学院,广东 广州 510642; 2 清远市兴渔水产科技有限公司,广东 清远 511510)

摘要:【目的】了解长臀Cranoglanis3个种群的野生资源状况,并对3个种群的物种有效性进行分析。【方法】采用线粒体控制区Dloop基因序列测定技术, 分析了珠江水系、海南水系和越南红河水系长臀种群的群体遗传结构及其变异。【结果】在检测的84个个体中共得到43个单倍型,呈现出较高的单倍型多样性与较为贫乏的核苷酸多样性,其中海南长臀C.multiradiatus群体的单倍型多样性(Hd=0.871)和核苷酸多样性(Pi=0.006 4)最低;Tajima’sD中性检验以及核苷酸不配对分析均表明,3个长臀群体趋于稳定,未经历过大规模的种群扩张。Fst分析发现,海南长臀同珠江长臀C.bouderius、红河长臀C.henrici产生了一定的遗传分化,而珠江和红河群体未发现明显遗传分化,从遗传距离来看,珠江和红河长臀净遗传距离为0.000。【结论】长臀野生资源较为贫乏,且海南群体最为严重;认为应将珠江长臀和红河长臀归为同一亚种长臀C.bouderius,而海南长臀作为长臀的另一个亚种。

关键词:长臀; 线粒体控制区; Dloop基因序列; 物种有效性; 遗传结构; 资源状况

鱼类线粒体基因是遗传信息重要的载体,具有母系遗传、进化速度快等特点,是研究种群遗传结构的理想材料[1-2];线粒体控制区又称D-环区(Dloop),其进化速度最快,是mtDNA其他区段的5~10倍[3],遗传变异大,是种群遗传多样性研究的常用标记之一,很适合做种内、种群或个体间的遗传分化研究[4]。

1材料与方法

1.1材料

1.2方法

2结果与分析

表1 长臀3个种群Dloop序列特征

Tab.2The distribution of 43 haplotypes in Cranoglanis populations

表3 长臀种群的遗传变异参数统计1)

1)*表示达统计显著水平 (P<0.05)。

图1 长臀群体Dloop基因序列的核苷酸不配对分布

Tab.4Pairwise genetic distances within population (diagonal), net genetic distance (above diagonal) and fixation index (Fst) (below diagonal) between Cranoglanis population

种群珠江长臀海南长臀红河长臀珠江长臀0.0150.0010.000海南长臀0.114*0.0060.003红河长臀0.0150.170*0.018

1)*表示达统计显著水平 (P<0.05)。

Z:珠江长臀C.bouderius;H:海南长臀C.multiradiatus;Y:红河长臀C.henrici。

3讨论

参考文献:

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【责任编辑柴焰】

Analysis of population genetic structure ofCranoglanisbased on

mitochondrial Dloop sequences

XIE Shaolin1, WANG Chao1,2, LÜ Zijun1, LI Zhengguang1, SHI Rennai2, ZOU Jixing1

(1 College of Animal Science, South China Agricultural University, Guangzhou 510642, China;

2 Qingyuan Xingyu Fishery Science Co., Ltd., Qingyuan 511510, China)

Abstract:【Objective】 In order to understand the current situation of wild resources for threeCranoglanispopulations and to evaluate the species validities of three species.【Method】The genetic structure and genetic variation of threeCranoglanispopulations (C.multiradiatus,C.bouderiusandC.henrici) were investigated by sequencing the Dloop genes in the mitochondrial control region. 【Result】Among 84 individuals from the three populations, fourty-three hapotypes were detected, indicating a relatively high haplotype diversity and low nucleotide diversity. The lowest hapotype diversity (Hd) and nucleotide diversity (Pi) were both found inC.multiradiatusgroup(Hd=0.871, Pi=0.006 4). Tajima’sDneutral test and nucleotide mismatch distribution analysis showed that the three populations were getting stable without experincing any large-scale expansion. Fst analysis suggested thatC.multiradiatushad certain genetic differentiation compared toC.bouderiusandC.henrici, while the latter two did not have any obvious differentiation from each other. The genetic distance betweenC.bouderiusandC.henriciwas 0.000. 【Conclusion】The wild resources forCranoglanisare relatively poor and the case inC.multiradiatusis the most serious.C.bouderiusandC.henriciare considered to be one subspecies, as well asC.multiradiatusbeing another subspecies ofCranoglanis.

Key words:Cranoglanisbouderius; mitochondrial control region; Dloop gene sequence;species validity; genetic structure; resource status

中图分类号:Q953

文献标志码:A

文章编号:1001-411X(2016)01-0008-06

基金项目:广东省海洋渔业科技推广专项科技攻关与研发项目(A201301F03);广东省海洋渔业科技与产业发展专项(A201501A02);科技型中小企业技术创新基金(14C26214402655)

作者简介:谢少林(1988—),男,博士研究生,E-mail:xieshaolinscau@163.com;通信作者:邹记兴(1966—),男,教授,博士, E-mail:zoujixing@scau.edu.cn

收稿日期:2015-01-28优先出版时间:2015-12-07

优先出版网址:http://www.cnki.net/kcms/detail/44.1110.s.20151207.1115.004.html