Unravelling the genetic differentiation among varieties of the Neotropical savanna tree Hancornia speciosa Gomes

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dc.creatorCollevatti, Rosane Garcia
dc.creatorRodrigues, Eduardo E.
dc.creatorVitorino, Luciana Cristina
dc.creatorRibeiro, Matheus de Souza Lima
dc.creatorChaves, Lázaro José
dc.creatorTelles, Mariana Pires de Campos
dc.date.accessioned2023-02-02T12:46:28Z
dc.date.available2023-02-02T12:46:28Z
dc.date.issued2018
dc.description.abstract• Background and Aims Spatial distribution of species genetic diversity is often driven by geographical distance (isolation by distance) or environmental conditions (isolation by environment), especially under climate change scenarios such as Quaternary glaciations. Here, we used coalescent analyses coupled with ecological niche modelling (ENM), spatially explicit quantile regression analyses and the multiple matrix regression with randomization (MMRR) approach to unravel the patterns of genetic differentiation in the widely distributed Neotropical savanna tree, Hancornia speciosa (Apocynaceae). Due to its high morphological differentiation, the species was originally classified into six botanical varieties by Monachino, and has recently been recognized as only two varieties by Flora do Brasil 2020. Thus, H. speciosa is a good biological model for learning about evolution of phenotypic plasticity under genetic and ecological effects, and predicting their responses to changing environmental conditions. • Methods We sampled 28 populations (777 individuals) of Monachino’s four varieties of H. speciosa and used seven microsatellite loci to genotype them. • Key Results Bayesian clustering showed five distinct genetic groups (K = 5) with high admixture among Monachino’s varieties, mainly among populations in the central area of the species geographical range. Genetic differentiation among Monachino’s varieties was lower than the genetic differentiation among populations within varieties, with higher within-population inbreeding. A high historical connectivity among populations of the central Cerrado shown by coalescent analyses may explain the high admixture among varieties. In addition, areas of higher climatic suitability also presented higher genetic diversity in such a way that the wide historical refugium across central Brazil might have promoted the long-term connectivity among populations. Yet, FST was significantly related to geographic distances, but not to environmental distances, and coalescent analyses and ENM predicted a demographical scenario of quasi-stability through time. • Conclusions Our findings show that demographical history and isolation by distance, but not isolation by environment, drove genetic differentiation of populations. Finally, the genetic clusters do not support the two recently recognized botanical varieties of H. speciosa, but partially support Monachino’s classification at least for the four sampled varieties, similar to morphological variation.pt_BR
dc.identifier.citationCOLLEVATTI, Rosane G.; RODRIGUES, Eduardo E.; VITORINO, Luciana C.; LIMA-RIBEIRO, Matheus S.; CHAVES, Lázaro J.; TELLES, Mariana P. C. Unravelling the genetic differentiation among varieties of the Neotropical savanna tree Hancornia speciosa Gomes. Annals of Botany, Oxford, v. 122. n. 6, p. 973–984, 2018. DOI: 10.1093/aob/mcy060. Disponível em: https://www-ncbi-nlm-nih.ez49.periodicos.capes.gov.br/pmc/issues/324898/. Acesso em: 26 jan. 2023.pt_BR
dc.identifier.doi10.1093/aob/mcy060
dc.identifier.issn0305-7364
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/21857
dc.language.isoengpt_BR
dc.publisher.countryGra-bretanhapt_BR
dc.publisher.departmentInstituto de Ciências Biológicas - ICB (RG)pt_BR
dc.rightsAcesso Abertopt_BR
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectApocynaceaept_BR
dc.subjectQuantile regressionpt_BR
dc.subjectBayesian clusteringpt_BR
dc.subjectCerradopt_BR
dc.subjectCoalescencept_BR
dc.subjectEcological niche modellingpt_BR
dc.subjectHierarchical AMOVApt_BR
dc.subjectIsolation by distancept_BR
dc.subjectIsolation by nvironmentpt_BR
dc.subjectMicrosatellitespt_BR
dc.subjectMultiple matrix regression with randomizationpt_BR
dc.titleUnravelling the genetic differentiation among varieties of the Neotropical savanna tree Hancornia speciosa Gomespt_BR
dc.typeArtigopt_BR

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