Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (2): 293-300.DOI: 10.3969/j.issn.1004-1524.2023.02.06

• Animal Science • Previous Articles     Next Articles

Genetic diversity analysis of three Opsariichthys bidens populations in Zhejiang Province based on mitochondrial Cyt b gene sequences

LIU Shili1,2(), LIAN Qingping1,2, JIA Yongyi1, CHI Meili1, LI Fei1, JIANG Jianhu1, LIU Yinuo1, ZHENG Jianbo1, CHENG Shun1, GU Zhimin1,*()   

  1. 1. Key Laboratory of Healthy Freshwater Aquaculture, Ministry of Agriculture and Rural Affairs / Key Laboratory of Freshwater Aquatic Animal Genetic and Breeding of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou 313001, Zhejiang, China
    2. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China
  • Received:2021-11-05 Online:2023-02-25 Published:2023-03-14
  • Contact: GU Zhimin

Abstract:

To further understand the status of germplasm resources and impact of artificial reproduction on population genetic structure of Opsariichthys bidens in Zhejiang Province, the mitochondrial Cyt b gene of Qiantang River (QT), Oujiang (OJ), and a cultured population from Balidian (BL) were amplified and determined. The 1 140 bp Cyt b gene sequence was obtained, and analyzed with the sequences of 236 individuals in GenBank. In these sequences, 288 variation sites were detected and 136 haplotypes were defined. The haplotype numbers of OJ, QT and BL populations were 1, 10 and 6, respectively. The haplotype diversity and nucleotide diversity of QT population were 0.716 and 0.016 16 respectively, while that of BL population were 0.607 and 0.012 05. The molecular variance analysis (AMOVA) showed that the genetic differences in Opsariichthys bidens were primarily derived from inter populations (55.06%) and minority from intra populations (44.94%), there was significant genetic differentiation among these populations (P<0.05). The stock of BL population came from QT, but its genetic diversity decreased after several generations of artificial reproduction. Phylogenetic tree constructed by the neighbor-joining method demonstrated that QT population could be divided into three branches: one branch was clustered with the haplotypes collected from Hunan of the Yangtze River system, and 63.64% of QT individuals belonged to this branch; the second branch was clustered with the haplotypes collected from Guangxi of the Pearl River System, 9.38% of the individuals belonged to this branch, and the remaining samples of QT and all the samples collected from OJ of Zhejiang were clustered into the third branch. This indicates that the ancestral origin of QT population is complex. This study provides reference for the protection and utilization of its germplasm resources.

Key words: Opsariichthys bidens, Cyt b, genetic diversity

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