Abstract
Key message
Polyploidy (diploid to octoploid) was evidenced from seven Psidium species, besides the outcomes of the whole-genome duplication about the nuclear DNA content, DNA sequence, and distribution.
Abstract
The previous studies have reported the occurrence of polyploid species in Psidium, all deriving from the basic chromosome number x = 11, which is conserved in Myrtaceae. Here, we aimed to assess the ploidy levels of seven Psidium species and to investigate the genomic outcomes of this karyotype change. Data on chromosome number, ploidy level, nuclear DNA content, and DNA sequence (SSR markers) were sought, quantified, and compared to geographical distribution of the studied Psidium species. A euploid series based on x = 11 was evidenced, with diploid, tetraploid, hexaploid, and octoploid species. These species also differed regarding at least one of the other analyzed traits, especially the hexaploids and the octoploid in relation to the others. Diploid species show restricted geographical distribution in the Atlantic Forest, differently from the polyploid species, which occur in several biomes in Brazil. Ploidy level of the Psidium species is related with the nuclear genome size and both seems to be related with species’ geographical distribution. Besides polyploidy, the genetic changes associated with numerical chromosome shift shown in this study, which increases the knowledge about the diversification and distribution of Psidium species.
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Acknowledgements
We would like to thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brasília—DF, Brazil; Grants 443801/2014-2 and 308828/2015-1, 305821/2016-4), Fundação de Amparo à Pesquisa do Espírito Santo (FAPES/VALE, Vitória—ES, Brazil; Grant 75516586/16), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ, Rio de Janeiro—RJ, Brazil) and VALE for financial support. This study was financid in part by the Coordernação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.
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Tuler, A.C., Carrijo, T.T., Peixoto, A.L. et al. Diversification and geographical distribution of Psidium (Myrtaceae) species with distinct ploidy levels. Trees 33, 1101–1110 (2019). https://doi.org/10.1007/s00468-019-01845-2
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DOI: https://doi.org/10.1007/s00468-019-01845-2