基于线粒体DNA D-loop序列的黄斑篮子鱼群体遗传多样性分析
作者简介:黄小林(1987—), 男, 助理研究员, 从事水产种质资源与遗传育种研究。E-mail: 499324782@qq.com
收稿日期: 2017-10-12
要求修回日期: 2018-03-31
网络出版日期: 2018-07-16
基金资助
广东省渔港建设与渔业发展专项海洋渔业科技推广方向-科技攻关与研发项目(A201601B10);广东省渔业生态环境重点实验室开放基金资助(FEEL-2017-13);深圳市科技计划知识创新基础研究项目(JCYJ20170817103922921、JCYJ20170817103856495);中国水产科学研究院南海水产研究所中央级公益性科研院所基本科研业务费专项资金资助(2016TS01)
Genetic variations among Siganus oramin populations in coastal waters of southeast China based on mtDNA control region sequences
Received date: 2017-10-12
Request revised date: 2018-03-31
Online published: 2018-07-16
Supported by
Marine Fishery Science and Technology Industry Projects from Guangdong Province (A201601B10);Guangdong Provincial Key Laboratory of Fishery Ecology and Environment (FEEL-2017-13);Knowledge Innovation Basic Research Project of Shenzhen Science and Technology Program (JCYJ20170817103922921、JCYJ20170817103856495);South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Scientific Research Funds for Central Non-profit Institutes (2016TS01)
Copyright
对中国华南沿海不同地理群体的黄斑篮子鱼(Siganus oramin)进行遗传多样性分析, 测定了漳州东山湾(DS)、深圳大亚湾(DY)、深圳大鹏湾(DP)、阳江沙扒湾(SB) 4个群体共计100尾黄斑篮子鱼线粒体DNA D-loop序列。结果显示: 序列长度约828bp, 包含72个变异位点, 50个单倍型, A、T、C、G含量平均为31.2%、31.1%、20.8%和16.9%; 单倍型多样性指数为0.893±0.053~0.957±0.030, 核苷酸多样性指数为0.0105±0.0031~0.0179±0.0031, 表现为高单倍型多样性而低核苷酸多样性的特点; 群体内的遗传距离0.0107~0.0184, 群体间的遗传距离0.0112~0.0172, AMOVA分析显示群体间的分子变异占0.66%, 群体内占99.34%; 中性检验结果表明Fu’s Fs检验值为显著的负值(-16.7079, p<0.01); 核苷酸不配对分布图呈单峰, 表明黄斑篮子鱼演化过程中经历过种群扩张事件, 推测扩张时间约在1.38~4.60万年前。综上, 华南沿海岸4个黄斑篮子鱼群体间不存在显著的遗传分化, 可划归一个管理单元, 而沙扒湾(SB)群体遗传多样性水平相对较高, 应优先加以保护。
关键词: 线粒体DNA D-loop; 黄斑篮子鱼; 群体遗传多样性
黄小林 , 李文俊 , 林黑着 , 杨育凯 , 李涛 , 虞为 , 黄忠 . 基于线粒体DNA D-loop序列的黄斑篮子鱼群体遗传多样性分析[J]. 热带海洋学报, 2018 , 37(4) : 45 -51 . DOI: 10.11978/2017109
In this study, we determined 828 bp mtDNA control region sequences of 100 Siganus oramin individuals collected in Daya Bay, Dapeng Bay, Shaba Bay, and Dongshan Bay where 72 variable sites defined 50 haplotypes. The parameter of haplotype diversity (h) were 0.893±0.053~0.957±0.030, and that of nucleotide diversity (π) was 0.0105±0.0031~0.0179± 0.0031, indicating a peculiarity of high haplotype diversity and low nucleotide diversity, The genetic diversity indexes of four geographical groups were, respectively, 0.0121 (DS), 0.0169 (DY), 0.0107 (DP), and 0.0184 (SB). A combination of the significant negative neutral test values of Fu’s Fs (-16.7079, p<0.01), the mismatch distribution pattern, and the network analysis revealed that a historical population expansion occurred at about 38300 years ago. The indices of genetic distance among populations (0.0112~0.0172) were at a similar level as the indices of genetic distance within populations (0.0107~0.0184). The overall genetic differentiation index (Fst) was 0.0066 (p>0.05), and the analysis of molecular variance showed that most of the genetic variations of the four populations was distributed within populations. With the above findings, it is suggested that S. oramin in the coastal waters of Southeast China is in low level of population genetic diversity and should receive effective protection.
Key words: mitochondrial D-loop; Siganus oramin; genetic diversity
Fig. 1 Location of sampling of S. oramin图1 黄斑篮子鱼采集样点 |
Tab. 1 Genetic diversity parameters and neutral test in four populations of S. oramin表1 黄斑篮子鱼D-loop序列的不同地理群体的遗传多样性指数和中性检验 |
群体 | 样品数 | 单倍型 | 单倍型多样性 | 核苷酸多样性 | Tajima’s D | Fu’s Fs | ||
---|---|---|---|---|---|---|---|---|
D | p | Fs | p | |||||
大鹏湾(DP) | 25 | 15 | 0.893±0.053 | 0.0105±0.0031 | -1.2309 | 0.096 | -1.7442 | 0.249 |
东山湾(DS) | 25 | 16 | 0.850±0.073 | 0.0119±0.0033 | -0.6957 | 0.260 | -2.0316 | 0.213 |
沙扒湾(SB) | 25 | 19 | 0.957±0.030 | 0.0179±0.0031 | -0.2758 | 0.427 | -2.7962 | 0.156 |
大亚湾(DY) | 25 | 16 | 0.900±0.054 | 0.0164±0.0029 | 0.7290 | 0.800 | -0.6942 | 0.392 |
合计 | 100 | 50 | 0.900±0.027 | 0.0142±0.0016 | -0.5064 | 0.335 | -16.7079 | 0.001 |
Fig. 2 Neighbor-joining tree constructed for mtDNA control region haplotypes of S. oramin图2 黄斑篮子鱼控制区单倍型的邻接系统树 |
Fig. 3 The haplotype network of mtDNA control region sequences of four S. oramin populations图3 基于控制区序列构建的黄斑篮子鱼单倍型网络图 |
Tab. 2 Genetic distance between (low diagonal), within (diagonal) populations and Pairwis Fst表2 群体间遗传距离(对角线下方)、群体内遗传距离(对角线)和群体间(对角线上方)的Fst值 |
群体 | DP | DS | SB | DY |
---|---|---|---|---|
DP | 0.0107 | -0.0150 | 0.0320 | 0.0263 |
DS | 0.0112 | 0.0121 | 0.0168 | 0.0045 |
SB | 0.0150 | 0.0155 | 0.0184 | -0.0250 |
DY | 0.0142 | 0.0146 | 0.0172 | 0.0169 |
注: 遗传距离p<0.01; p(Fst)>0.05; 加粗部分下方的遗传距离检验显著, 加粗部分和其上方的遗传分化指数不显著 |
Tab. 3 Mismatch distribution parameters of S. oramin表3 核苷酸不配对分布分析参数估计值 |
群体 | 核苷酸不配对分布 | 拟合优度检验 | |||||
---|---|---|---|---|---|---|---|
扩张 参数τ | 初始 值θ | 最终 值θ1 | 差平方 和SSD | p(SSD) | 粗糙指数R | p(R) | |
DP | 6.5371 | 0 | 12.9541 | 0.0383 | 0.0500 | 0.0459 | 0.2400 |
DS | 31.2402 | 0.0018 | 6.4972 | 0.0178 | 0.9500 | 0.0265 | 0.8100 |
SB | 1.5000 | 13.0236 | 29.1961 | 0.0212 | 0.4700 | 0.0153 | 0.7200 |
DY | 0 | 0 | 99999 | 0.8757 | 0 | 0.0304 | 1 |
合计 | 3.6582 | 6.0408 | 9.9870 | 0.0194 | 0.4100 | 0.0128 | 0.8400 |
Fig. 4 Mismatch-distribution analysis of S. oramin图4 核苷酸不配对分析图 |
The authors have declared that no competing interests exist.
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