ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (11): 2468-2476.doi: 10.11843/j.issn.0366-6964.2018.11.019

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Genetic Diversity of Psoroptes ovis var. cuniculi Determined by the Full-length of Mitochondrial 12S Gene in China

LI Yan-fang, GU Jiang, YUAN Yuan, XIE Yue, LAI Wei-min, YANG Guang-you, GU Xiao-bin*   

  1. College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2018-03-23 Online:2018-11-23 Published:2018-11-23

Abstract:

To explore the genetic diversity and genetic structure of Psoroptes ovis var. cuniculi, the complete sequence of mitochondrial 12S gene of P. ovis var. cuniculi isolates from 5 geographical regions (Huabei, Huadong, Huazhong, Xibei, and Xinan) in China, were obtained by PCR sequencing techniques, and evaluated the genetic diversity of P. ovis population. Eighty-nine sequences of mitochondrial 12S were obtained. The multiple alignments of the full 12S gene from 89 isolates were 657 bp. These sequences contained 76 variable sites and were classified into 50 haplotypes (H1-H50). The values of haplotypes diversitiy (Hd) and nucleotide diversity (π) were 0.931 05 and 0.005 59 respectively. There were low level of genetic differentiation, but high level of gene flow (Fst=0.042 322, Nm=5.657 372) among the 5 geographical population. In P. ovis population, the average values of Tajima's D and Fu's Fs were negative (Tajima's D=-0.928 31, Fu's Fs=-7.066 71) and there was no significant difference (P<0.05). NJ phylogenetic tree and haplotype network were both revealed that 50 haplotypes from 5 different geographical regions dispersed across different clades without associating with the geographical locations. The results revealed that there was a high level of genetic diversity, little population genetic differentiation and high gene flow in the P. ovis var. cuniculi population of China, but population structure has not formed according to rabbits breed, temperature zones and geography origin.

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