Genetic Diversity and Genetic Structure of Phascolosoma esculenta Populations in Southeastern China Based on 16S rRNA Gene Sequences

IF 0.6 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES
Binbin Feng, Chen Du, Danli Mu, Xinming Gao, Jian-Ling Lou, Jianping Wang, Junquan Zhu, Shan Jin, Chundan Zhang
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Abstract

Here, we investigated the population genetic structure and genetic diversity of the endemic Chinese oceanic sipuncula Phascolosoma esculenta by using partial mitochondrial DNA 16S rRNA sequences. In total, 80 samples were collected from Xiangshan, Wenling, Ningde, and Zhanjiang, which are four muddy intertidal zones of southeastern China. Results showed that of the 80 16S rRNA gene fragments, 5 were 1010 bp in length, 73 were 1011 bp in length, and 2 were 1012 bp in length. The A+T content (67.7%) was signifi cantly higher than the C+G content (32.3%), thus exhibiting obvious AT biases. In addition, 27 different haplotypes were defi ned by 33 polymorphic sites, giving an overall haplotype diversity of 0.908 and a nucleotide diversity of 0.00247. The topological structure of the haplotype neighbor-joining tree was extremely simple, without any obvious geographical structures within the four groupings. The genetic distances among populations ranged from 0.0022 to 0.0031, and those within populations ranged from 0.002 to 0.0028. The results of AMOVA revealed a low level of genetic differentiation among the four populations. A neutral test and mismatch analysis indicated a recent population expansion for P. esculenta.
基于16S rRNA基因序列的中国东南部肉豆杉居群遗传多样性及遗传结构分析
本文利用线粒体DNA 16S rRNA部分序列分析了中国特有海洋phascolsoma esculenta的种群遗传结构和遗传多样性。在中国东南部的象山、温岭、宁德和湛江这4个泥质潮间带共采集了80份样品。结果表明,80个16S rRNA基因片段中,长度为1010 bp的有5个,长度为1011 bp的有73个,长度为1012 bp的有2个。A+T含量(67.7%)显著高于C+G含量(32.3%),表现出明显的AT偏倚。此外,33个多态性位点定义了27个不同的单倍型,总单倍型多样性为0.908,核苷酸多样性为0.00247。单倍型邻接树的拓扑结构极为简单,4个类群内没有明显的地理结构。居群间遗传距离为0.0022 ~ 0.0031,居群内遗传距离为0.002 ~ 0.0028。AMOVA分析结果显示,4个居群的遗传分化程度较低。中性试验和错配分析表明,近年来褐皮草种群扩大。
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来源期刊
Chiang Mai Journal of Science
Chiang Mai Journal of Science MULTIDISCIPLINARY SCIENCES-
CiteScore
1.00
自引率
25.00%
发文量
103
审稿时长
3 months
期刊介绍: The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so.
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