Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (8): 1779-1788.DOI: 10.3969/j.issn.1004-1524.20230874

• Animal Science • Previous Articles     Next Articles

Investigation on the genetic diversity of Sarcocheilichthys sinensis from diverse geographical populations and other species within the Sarcocheilichthys genus through the analysis of mitochondrial COI sequence segments

HUANG Hui(), CHU Tianjiang, XIE Nan, LIU Kai()   

  1. Institute of Fishery Science, Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, China
  • Received:2023-07-24 Online:2024-08-25 Published:2024-09-06
  • Contact: LIU Kai

Abstract:

The genus Sarcocheilichthys, commonly found in East Asia, comprises small freshwater fish species with potential for aquaculture and development. Gaining a thorough understanding of the genetic structure and geographic variation of Sarcocheilichthys fish is of great significance for scientifically formulating conservation plans and ensuring sustainable utilization of wild resources. The experimental subjects included S. parvus(XQ) of 20 individuals, S. kiangsiensis(JXQ) of 20 individuals, S. nigripinnis(HQQ) of 20 individuals, S. lacustris(DBQ) of 24 individuals, and multiple geographic populations of S. sinensis, including Huaihe population (HQHH) of 20 individuals, Minjiang population (HQMJ) of 17 individuals, Jiangxi population (HQJX) of 15 individuals, and Jiande population (HQJD) of 17 individuals. The mitochondrial cytochrome C oxidase subunit I (COI) sequence segments of each population were sequenced and analyzed. Among the 153 obtained sequence samples, there were 507 conserved sites, 154 variable sites, 150 parsimony informative sites, and 27 sites with base deletions or insertions, with an average transition/transversion ratio of 5.2. The Hd (haplotype diversity) of the HQQ population was the lowest (0.442), slightly higher in the HQHH population (0.574), and further increased in the DBQ population (0.707). The XQ population showed the highest Hd (0.963), while HQMJ and HQJX populations had slightly lower Hd values than XQ (0.860 and 0.848, respectively). Nucleotide diversity exhibited a similar trend to Hd results. A total of 153 individuals defined 56 haplotypes, and each population exhibited major haplotypes within their respective haplotype networks, such as Hap_2, Hap_33, and Hap_37, among others. The UPGMA molecular phylogenetic tree, hierarchical clustering tree, and NeighborNet molecular phylogenetic network constructed based on genetic distance indicated that the genetic relationships between XQ, HQQ, JXQ, and other Sarcocheilichthys fish were relatively distant. At the same time, DBQ had a closer genetic relationship with the HQHH population. This study used COI sequence segments to assess the genetic diversity of four geographic populations of S. sinensis and four other Sarcocheilichthys species. The research results contribute to understanding the current genetic diversity of different geographic populations of S. sinensis and four other Sarcocheilichthys species, providing valuable insights for the conservation and breeding of germplasm resources in S. sinensis and other Sarcocheilichthys fish in the future.

Key words: Sarcocheilichthys sinensis, Sarcocheilichthys genus, mitochondria, COI, genetic diversity

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