Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (3): 641-654.doi: 10.16420/j.issn.0513-353x.2020-1021

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Sorbus koehneana(Rosaceae):Its Complete Chloroplast Genome and Phylogenetic Relationship with S. unguiculata

TANG Chenqian, QIU Zhixin, TAN Chao, QIAN Yuming, CHEN Xin*()   

  1. Co-Innovation Center for Sustainable Forestry in Southern China,College of Biology and the Environment,Nanjing Forestry University,Nanjing 210037,China
  • Received:2021-04-02 Revised:2021-12-14 Online:2022-03-25 Published:2022-03-25
  • Contact: CHEN Xin


The complete chloroplast(cp)genome of Sorbus koehneana and its phylogenetic relationship with S. unguiculata were analyzed. The complete cp genome of S. koehneana is 159 873 bp in size with 36.60% GC content. It has a typical quadripartite structure including a small single copy(SSC)region of 19 218 bp,a large single copy(LSC)region of 87 899 bp and a pair of inverted repeat regions (IRs)of 26 378 bp. The cp genome encodes 108 genes,comprising 76 protein-coding genes,four rRNA genes and 28 tRNA genes. Additionally,47 simple sequence repeats(SSRs)and 48 interspersed nuclear elements(INEs)were identified. In Sorbus,cp genome is highly conserved in length,gene type,codon number,intron number and GC content. However,the different sequence repeats and 12 highly variable regions located in intergenic spacers may be used for population genetic and phylogenetic studies in future. Phylogenetic analyses revealed that S. koehneana,S. unguiculata and S. helenae are in the same lineage nested within Sorbus subg. Sorbus. However,S. unguiculata is sister to S. helenae instead of S. koehneana. So the treatment of S. unguiculata as a synonym of S. koehneana is not supported and the name S. unguiculata is proposed to be reinstated here.

Key words: Sorbus, chloroplast genome, genomic comparison, phylogenetic analysis

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