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Chloroplast genome structures in Gentiana (Gentianaceae), based on three medicinal alpine plants used in Tibetan herbal medicine

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Abstract

The genus Gentiana is the largest in the Gentianaceae family with ca. 400 species. However, with most species growing on the Qinghai–Tibet plateau, the processes of adaptive evolution and speciation within the genus is not clear. Also, the genomic analyses could provide important information. So far, the complete chloroplast (cp) genome data of the genus are still deficient. As the second and third sequenced members within Gentianaceae, we report the construction of complete cp sequences of Gentiana robusta King ex Hook. f. and Gentiana crassicaulis Duthie ex Burk., and describe a comparative study of three Gentiana cp genomes, including the cp genome of Gentiana straminea Maxim. published previously. These cp genomes are highly conserved in gene size, gene content, and gene order and the rps16 pseudogene with exon2 missing was found common. Three repeat types and five SSR types were investigated, and the number and distribution are similar among the three genomes. Sixteen genome divergent hotspot regions were identified across these cp genomes that could provide potential molecular markers for further phylogenetic studies in Gentiana. The IR/SC boundary organizations in Gentianales cp genomes were compared and three different types of boundaries were observed. Six data partitions of cp genomes in Gentianales were used for phylogenetic analyses and different data partitions were largely congruent with each other. The ML phylogenetic tree was constructed based on the fragments in cp genomes commonly available in 33 species from Lamiids, including 12 species in Gentianales, 1 in Boraginaceae, 10 in Solanales, and 10 in Lamiales. The result strongly supports the position of Boraginaceae (Ehretia acuminata) as the sister of Solanales, with the bootstrap values of 97 %. This study provides a platform for further research into the molecular phylogenetics of species in the order Gentianales (family Gentianaceae) notably in respect of speciation and species identification.

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Acknowledgments

The authors thank MSc Christine Leon from Royal Botanic Gardens, Kew for assistance in English revision. Also, this work was supported by grants from the National Natural Science Foundation of China (No. 81173654).

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Authors and Affiliations

  1. School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China

    Lianghong Ni, Zhili Zhao & Hongxi Xu

  2. Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China

    Shilin Chen

  3. Tibetan Traditional Medical College, Lhasa, 850000, China

    Gaawe Dorje

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  1. Lianghong Ni
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  2. Zhili Zhao
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  3. Hongxi Xu
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  4. Shilin Chen
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  5. Gaawe Dorje
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Correspondence to Zhili Zhao.

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Communicated by M. Kupiec.

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Ni, L., Zhao, Z., Xu, H. et al. Chloroplast genome structures in Gentiana (Gentianaceae), based on three medicinal alpine plants used in Tibetan herbal medicine. Curr Genet 63, 241–252 (2017). https://doi.org/10.1007/s00294-016-0631-1

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  • DOI: https://doi.org/10.1007/s00294-016-0631-1

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