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Chloroplast genome assembly of Handroanthus impetiginosus: comparative analysis and molecular evolution in Bignoniaceae

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Abstract

Main conclusion

Bignoniaceae species have conserved chloroplast structure, with hotspots of nucleotide diversity. Several genes are under positive selection, and can be targets for evolutionary studies.

Abstract

Bignoniaceae is one of the most species-rich family of woody plants in Neotropical seasonally dry forests. Here we report the assembly of Handroanthus impetiginosus chloroplast genome and evolutionary comparative analyses of ten Bignoniaceae species representing the genera for which whole-genome chloroplast sequences were available. The chloroplast genome of H. impetiginosus is 159,462 bp in size and has a similar structure compared to the other nine species. The total number of genes was slightly variable amongst the Bignoniaceae, ranging from 124 in H. impetiginosus to 144 in Anemopaegma acutifolium. The inverted repeat (IR) size was variable, ranging from 24,657 bp (Tecomaria capensis) to 40,481 bp (A. acutifolium), due to the contraction and retraction at its boundaries. However, gene boundaries were very similar among the ten species. We found 98 forward and palindromic dispersed repeats, and 85 simple sequence repeats (SSRs). In general, chloroplast sequences were highly conserved, with few nucleotide diversity hotspots in the genes accD, clpP, rpoA, ycf1, ycf2. The phylogenetic analysis based on 77 coding genes was highly consistent with Angiosperm Phylogeny Group (APG) IV. Our results also indicate that most genes are under negative selection or neutral evolution. We found no evidence of branch-site selection, implying that H. impetiginosus is not evolving faster than the other species analyzed, notwithstanding we found site positive selection signal in several genes. These genes can provide targets for evolutionary studies in Bignoniaceae and Lamiales species.

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Data availability statement

Additional data are provided as supporting information in the online version of this article.

Abbreviations

AICc:

Akaike Information Criterion corrected for small sample size

FDR:

False Discovery Rate

HMM:

Hidden Markov Model

IR:

Inverted Repeat

LSC:

Large Single Copy

LRT:

Likelihood Ratio Test

RSCU:

Relative Synonymous Codon Usage

SSC:

Small Single Copy

SSR:

Simple Sequence Repeats

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Acknowledgements

This work was supported by competitive grants from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) to RGC (project no. 470306/2013-0 and CNPq/PPBio project no. 457406/2012-7), and Procad/Capes project # 88881.068425/2014-01), and to DG (PRONEX FAP-DF Project Grant “NEXTREE” 193.000.570/2009). RGC and DG have been supported by productivity grants from CNPq, which we acknowledge. MBS and LDV received a doctoral fellowship from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). RN received a fellowship from Nacional Institutes for Science and Technology in Ecology, Evolution and Biodiversity Conservation (INCT—EECBio), supported by CNPq and Fundação de Amparo à Pesquisa do Estado de Goiás (FAPEG).

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Correspondence to Rosane Garcia Collevatti.

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The authors declare no conflict of interest.

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Communicated by Dorothea Bartels.

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Sobreiro, M.B., Vieira, L.D., Nunes, R. et al. Chloroplast genome assembly of Handroanthus impetiginosus: comparative analysis and molecular evolution in Bignoniaceae. Planta 252, 91 (2020). https://doi.org/10.1007/s00425-020-03498-9

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  • DOI: https://doi.org/10.1007/s00425-020-03498-9

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