Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (9): 1856-1865.DOI: 10.3969/j.issn.1004-1524.2022.09.05

• Animal Science • Previous Articles     Next Articles

Genetic diversity of wild and cultured populations of little yellow croaker (Larimichthys polyactis) based on mitochondrial Cytb gene and D-loop region

GUO Dandan(), LIU Feng, NIU Baolong, LOU Bao()   

  1. Institute of Hydrobiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2022-01-04 Online:2022-09-25 Published:2022-09-30
  • Contact: LOU Bao

Abstract:

In order to study the genetic diversity of wild and cultured populations of little yellow croaker (Larimichthys polyactis), the genetic structure and differentiation of two wild (SS and SMK) and one cultured (YZ) populations of little yellow croaker was analyzed based on mitochondrial DNA Cytb gene and D-loop control region. The results showed that the sequences of Cytb gene were 841 bp, with A+T (50.2%) content similar to C+G (49.8%) content. The D-loop sequences were 629-635 bp, and A+T content (58.9%) was significantly higher than C+G content (41.1%). Based on the analysis of Cytb gene, the haplotypes of SS, SMK and YZ populations were 26, 27 and 12, respectively. SS and SMK populations shared two haplotypes (hap1 and hap13), SMK and YZ populations shared one haplotypes (hap41). Based on D-loop, the haplotypes of SS, SMK and YZ populations were 27, 30 and 10, respectively, and SS and SMK populations shared one haplotype (Hap4). The diversity results showed that the haplotype diversity (Hd>0.5) of the three populations were high. In addition, the haplotype diversity and nucleotide diversity of SS and SMK populations were slightly higher than those of YZ population, indicating that the diversity of wild populations was higher than that of cultured population. The results of fixation index and AMOVA showed that the genetic variation was mainly derived from individual variation within the population, the genetic differentiation between populations of SS and SMK was small, but there was a moderate differentiation between the cultured and wild population. Neutral test analysis of SS and SMK populations showed that Tajima’s D and Fu and Li's value were both negative, and significantly (P<0.05) deviated from neutral based on Cytb gene, indicating that both wide populations have undergone a recent population expansion. The haplotype phylogenetic tree was shown that SS, SMK and YZ populations did not formed monophyletic group, which indicated that the genetic differentiation of the three populations was not significant.

Key words: Larimichthys polyactis, mitochondrial DNA, Cytb gene, D-loop region, genetic diversity

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