关键词: <, p>, 柽柳沙鼠, 细胞色素 B, 进化分析<, /p>

Abstract: Abstract: Objective Complete sequence of mitochondrial Cytochrome b of Tamarisk jird was cloned by the PCＲ method ． The sequence was determined and used to phylogenetic analysis． Method The primer was designed according to the published sequences． The PCＲ product was sequenced and determined． The Cyt b sequences of 24 rodents were used to analyze the nucleotide composition and genetic distance． These sequences also used to construct the phylogenetic tree base on maximum likelihood and maximum parsimony． Ｒesult The Cyt b gene was cloned in Tamarisk jird，which have high homology with Mongolian gerbil and Midday jird． The result of phylogenetic tree showed that Tamarisk jird is higher genetic relationship with Meriones and Cricetidae． The result of nucleotide composition showed that nucleotide composition of Tamarisk jird showed the characteristics of mammal mtDNA; the nucleotide composition of Tamarisk jird is similar with Meriones and Ｒattus． Conclusion In this research，the genetic relationship between the Tamarisk jird with other rodents was analyzed． This research is an important work for study on evolution，structure and function of the Tamarisk jird mitochondrion．

Key words: <p>Tamarisk jird, Cyt b, phylogenetic analysis</p>