Intrageneric Relationship of Datnioides (Lobotiformes) Inferred from the Complete Nuclear Ribosomal DNA Operon
文献类型： 外文期刊
作者： Wang, Yuanyuan 1 ; Zhou, Hong 1 ; Yang, Yexin 1 ; Sun, Jinhui 2 ; Liu, Yi 1 ; Liu, Chao 1 ; Xia, Sudong 2 ; Mu, Xidong 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Key Lab Prevent & Control Aquat Invas Alien Specie, Guangdong Modern Recreat Fisheries Engn Technol Ct, Pearl River Fisheries Res Inst,Minist Agr & Rural, Guangzhou, Peoples R China
2.Tianjin Agr Univ, Coll Fisheries, Tianjin, Peoples R China
关键词： Datnioides; Nuclear Ribosomal DNA; Phylogeny; Tiger fish
期刊名称：BIOCHEMICAL GENETICS （ 影响因子：2.4； 五年影响因子：2.2 ）
ISSN： 0006-2928
年卷期： 2023 年 61 卷 4 期
页码：
收录情况： SCI
摘要： Tiger fish (genus Datnioides) are critical ornamental and economic fish and are valuable freshwater fish worldwide, belonging to the order Lobotiformes. Currently, there are five extant species (Datnioides campbelli, D. microlepis, D. polota, D. pulcher, and D. undecimradiatus) of Datnioides in the world, usually inhabiting in south and southeast Asia. Due to the decline of wild population sizes of tiger fish and the lack of molecular research on them, in the present study, we sequenced, assembled, and characterized the complete nuclear ribosomal DNA (nrDNA) operon of all five extant tiger fish species, in order to elucidate the phylogenetic relationship among the genus Datnioides. The nrDNA sequences of five tiger fish species were 8548-9182 bp in length, encompassing complete 18S rDNA, ITS1, 5.8S rDNA, ITS2, 28S rDNA, and IGS regions. Numerous repetitive sequences were detected, substantially influencing the sequence length of different regions in each species. We employed maximum-likelihood (ML) method and Bayesian inference (BI) method to construct phylogenetic trees for Datnioides. Phylogenetic analyses indicated that each region in nrDNA operon is not sufficiently phylogenetically informative to delineate the species in Datnioides; nevertheless, the whole operon is able to delineate five tiger fish species much better, three of five species were successfully partitioned. Particularly, regardless of employed markers, it was strongly supported that D. campbelli was considerably partitioned from the other four species, possibly due to the geographical separation. In spite of the fact that discrimination of Datnioides species requires further investigation, our study provides reference genome resources for the Lobotiformes, as well as insights into the phylogenetic position of Lobotiformes and further biological conservation.
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