China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (6): 2150-2159.doi: 10.16431/j.cnki.1671-7236.2021.06.028

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Genetic Variation and Phylogenetic Evolution of Haemaphysalis flava from Different Geographical Areas in China

LI Zhongbo1, YAO Guomin1, LOU Wei1, WANG Xiang1, CHENG Tianyin1,2, LIU Guohua2, HOU Qianghong1   

  1. 1. Huaihua Vocational and Technical College, Huaihua 418000, China;
    2. College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China
  • Received:2020-12-28 Online:2021-06-20 Published:2021-06-18

Abstract: To explore the genetic variation and phylogenetic evolution of Haemaphysalis flava (H. flava) collected from different geographical areas in China,a total of 20 H. flava from Hunan and Henan provinces were used in this study,their internal transcribed spacer Ⅱ (ITS-2) and NADH dehyd ogenase subunit Ⅰ (nad1) sequences were amplified by PCR,and the genetic variations in the obtained sequences were analyzed.Moreover,the phylogenetic relationship of H. flava from two provinces was analyzed,and two phylogenetic trees were established using the obtained ITS-2 and nad1 genes sequence.The results showed that the intra-specific sequence variations of ITS-2 and nad1 genes within H. flava from Hunan and Henan provinces were 0 to 1.9% and 0 to 0.4%,respectively.The intra-specific sequence variations of ITS-2 and nad1 genes within H. flava from Hunan province were 0 to 1.4% and 0 to 0.4%,respectively.The intra-specific sequence variations of ITS-2 and nad1 genes within H. flava from Henan province were 0 to 1.2% and 0 to 0.4%,respectively.The inter-specific sequence variations of ITS-2 and nad1 genes of H. flava were 37.0% to 52.0% and 13.6% to 24.8%,respectively.The phylogenetic analysis showed that all samples are on a clades in two phylogenetic trees established by ITS-2 and nad1 genes sequence.The results indicated that there was genetic variation between H. flava from Hunan and Henan provinces,but the genetic variation and genetic diversity of H. flava from Henan province were higher than that from Hunan province.The phylogenetic relationship of H. flava from Hunan and Henan provinces was closed.The results suggested that there was gene exchange within H. flava from Hunan and Henan provinces,and no genetic differentiation between all samples.

Key words: Haemaphysalis flava; ITS-2 gene; nad1 gene; genetic variation; phylogenetic evolution

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