Heterochromatic and cytomolecular diversification in the Caesalpinia group (Leguminosae): relationships between phylogenetic and cytogeographical data

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dc.creatorNascimento, Brena Van-Lume do
dc.creatorMelo, Tiago Esposito Couceiro
dc.creatorDiniz Filho, José Alexandre Felizola
dc.creatorGagnon, Edeline
dc.creatorLewis, Gwilym Peter
dc.creatorSouza, Luiz Gustavo Rodrigues
dc.date.accessioned2023-07-04T13:37:12Z
dc.date.available2023-07-04T13:37:12Z
dc.date.issued2017
dc.description.abstractThe pantropical Caesalpinia group comprises 27 genera and approximately 205 species. The Neotropical species of the group are distributed in three main centers of diversity: the Andes, Mesoamerica (including Mexico, Central America, the southern USA and the Caribbean), and Northeastern Brazil. Our study investigates patterns of phylogenetic, environmental and geographical variation in an attempt to explain the karyotypic diversity which occurs within the Caesalpinia group. Cytogenetic analyses were based on chromosome number and morphology, CMA and DAPI heterochromatic bands, distribution of rDNA sites, and their molecular phylogenetic relationships based on the plastid markers matK, rps16, trnDT, trnL and ycf6 and the nuclear ribosomal marker ITS. Ecological differentiation among cytotypes was tested by comparing sets of climatic variables. In total, twenty species from ten genera of the Caesalpinia group were analysed, and all of them were found to have the same chromosome number (2n = 24). CMA+/DAPI− bands were observed on the short arms of the acrocentric chromosomes in all of the species. Additionally, three different patterns were observed on the metacentric chromosomes: proximal CMA+/DAPI− bands, proximal CMA0 /DAPI− bands and terminal CMA+/ DAPI− bands. The 45S rDNA sites varied from eight to 14, always co-localizing with CMA+/DAPI− bands of acrocentrics, while 5S rDNA was localized in only a single chromosome pair in most species. A correlation between heterochromatic patterns and the geographic distributions/ecological niche of species was observed. Our analyses support some shared effects of the environment, when integrated with phylogeny and geography, on the CMA/DAPI variability. Thus, CMA+ heterochromatin is highly dynamic and its amplification/deamplification might be non-random, generating similar karyotypes in species which are not sister taxa in the molecular phylogeny but which co-occur in similar environmentspt_BR
dc.identifier.citationVAN-LUME, Brena et al. Heterochromatic and cytomolecular diversification in the Caesalpinia group (Leguminosae): relationships between phylogenetic and cytogeographical data. Perspectives in Plant Ecology Evolution and Systematics, Amsrterdam, v. 29, p. 51-63, 2017. DOI: 10.1016/j.ppees.2017.11.004. Disponível em: https://www.sciencedirect.com/science/article/pii/S1433831917300811. Acesso em: 15 jun. 2023.pt_BR
dc.identifier.doi10.1016/j.ppees.2017.11.004
dc.identifier.issn1433-8319
dc.identifier.issne- 1618-0437
dc.identifier.issn1618-0437
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S1433831917300811
dc.language.isoengpt_BR
dc.publisher.countryHolandapt_BR
dc.publisher.departmentInstituto de Ciências Biológicas - ICB (RMG)pt_BR
dc.rightsAcesso Restritopt_BR
dc.subjectMolecular phylogenypt_BR
dc.subjectComparative phylogenetic methodspt_BR
dc.subjectCytogeographypt_BR
dc.subjectHeterochromatinpt_BR
dc.titleHeterochromatic and cytomolecular diversification in the Caesalpinia group (Leguminosae): relationships between phylogenetic and cytogeographical datapt_BR
dc.typeArtigopt_BR

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