In order to analyze the chloroplast genome characteristics of Syringa pekinensis,this study analyzed the chloroplast genome structure and gene composition characteristics,and combined with 35 other Oleaceae species and 2 Paulownia species for phylogenetic analysis.The results are as follows.(1)The plastid genome of S.pekinensis encodes 131 genes,including 36 tRNA genes,8 rRNA genes and 87 mRNA genes,accounting for 27.48%,6.11%and 66.41%of all annotated genes,respectively.(2)In the codon composition of the chloro-plast genome,there were 30 codons with RSCU value>1 and 31 codons with RSCU value<1,and the codons had the preference of ending with G and C.(3)A total of 178 forward repeats and 177 palindromic repeats were identified in the plastid genome of S.pekinensis.(4)The NJ phylogenetic tree showed that the genetic re-lationship between S.pekinensis and S.reticulata was close,and the genetic relationship between Syringa and Ligustrum was close.
关键词
北京丁香/木犀科/质体/系统发育树
Key words
Syringa pekinensis/Oleaceae/plastid/phylogenetic tree