Abstract

Gleditsia sinensis is an endemic species widely distributed in China with high economic and medicinal value. To explore the genomic evolution and phylogenetic relationships of G. sinensis, the complete mitochondrial (mt) genome of G. sinensis was sequenced and assembled, which was firstly reported in Gleditsia. The mt genome was circular and 594,121 bp in length, including 37 protein-coding genes (PCGs), 19 transfer RNA (tRNA) genes and 3 ribosomal RNA (rRNA) genes. The overall base composition of the G. sinensis mt genome was 27.4% for A, 27.4% for T, 22.6% for G, 22.7% for C. The comparative analysis of PCGs in Fabaceae species showed that most of the ribosomal protein genes and succinate dehydrogenase genes were lost. In addition, we found that the rps4 gene was only lost in G. sinensis, whereas it was retained in other Fabaceae species. The phylogenetic analysis based on shared PCGs of 24 species (22 Fabaceae and 2 Solanaceae) showed that G. sinensis is evolutionarily closer to Senna species. In general, this research will provide valuable information for the evolution of G. sinensis and provide insight into the phylogenetic relationships within the family Fabaceae.

Highlights

  • Gleditsia sinensis is an endemic species widely distributed in China with high economic and medicinal value

  • The serial endosymbiosis theory is the most popular theory explaining the origin of mitochondria, which suggests that mitochondria originated from an endosymbiotic α-proteobacteria[4]

  • The complete mt genome of G. sinensis is 594,121 bp in length with a circular structure (Fig. 1), and its size is similar to the mt genomes of some Fabaceae plants, such as V. faba (588,000 bp)[25], L. coriaria (601,574 bp)[26] and T. indica (607,282 bp)[26]

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Summary

Introduction

Gleditsia sinensis is an endemic species widely distributed in China with high economic and medicinal value. Gene loss and phylogenetic analyses were performed by comparisons with other Fabaceae plants mt genomes. The complete mt genome of G. sinensis is 594,121 bp in length with a circular structure (Fig. 1), and its size is similar to the mt genomes of some Fabaceae plants, such as V. faba (588,000 bp)[25], L. coriaria (601,574 bp)[26] and T. indica (607,282 bp)[26].

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