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Comparative cytogenetics of three economically important Piper L. species from the Brazilian Amazon

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Abstract

The species Piper hispidinervum, Piper aduncum, and Piper affinis hispidinervum have essential oils with high levels of safrole, dillapiole, and sarisan, respectively. Safrole is important for pharmaceutical and chemical industries, while dillapiole and sarisan are promising compounds to control insects and fungi. These species are very similar morphologically and their taxonomy is controversial. Divergent hypotheses consider P. aduncum and P. hispidinervum either as a single species or as distinct taxa, while P. affinis hispidinervum is inferred to be a natural hybrid or a chemotype of P. hispidinervum. Delimiting the taxonomic boundaries would be helpful for germplasm conservation and breeding programs. This study aimed to undertake a detailed analysis of P. aduncum, P. hispidinervum, and P. affinis hispidinervum karyotype and rDNA sites. Genomic in situ hybridization (GISH) was used to establish genomic homology among species and to test the natural hybridization hypothesis for origin of P. affinis hispidinervum. Karyotype traits were similar for all three species: 2n = 26 small chromosomes, predominantly metacentric. All three species exhibited CMA+ bands on the secondary constriction of chromosome pair 4. A size-heteromorphic 35S rDNA site was co-localized with the CMA+ band. A 5S rDNA site was located in the proximal region of chromosome pair 7. The patterns of genomic hybridization revealed that the repetitive DNA fraction of the species is highly similar in terms of proportion of genome, sequence type, and distribution. Our findings did not allow us to differentiate the three species and point to the importance of deeper genomic studies to elucidate the taxonomic controversy.

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Acknowledgements

The authors are financially supported by the agencies Conselho Nacional de Pesquisa e Desenvolvimento Científico (CNPq) and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) and Coordenação de Apefeiçomento do Pessoal do Ensino Superior (CAPES) for the scholarship of N.R.S.

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Correspondence to Giovana Augusta Torres.

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709_2021_1721_MOESM1_ESM.jpg

Figure 1S. Illustration of high morphological similarity among the species Piper hispidinervum (a); Piper aduncum (b); Piper affinis hispidinervum (c). (JPG 155 KB)

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Soares, N.R., Correa, C.T.R., da Silva, J.C. et al. Comparative cytogenetics of three economically important Piper L. species from the Brazilian Amazon. Protoplasma 259, 1099–1108 (2022). https://doi.org/10.1007/s00709-021-01721-2

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  • DOI: https://doi.org/10.1007/s00709-021-01721-2

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