Karyological traits related to phylogenetic signal and environmental conditions within the Hymenaea clade (Leguminosae, Detarioideae)
Nenhuma Miniatura disponível
Data
2019
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
The Hymenaea clade is a lineage of the subfamily Detarioideae of Leguminosae. The clade is currently composed
of three genera: Guibourtia, Hymenaea, and Peltogyne. The genera Guibourtia and Hymenaea present an AmphiAtlantic distribution, whereas Peltogyne is exclusively found in the Neotropics. Previous studies have focused on
the phylogeny of the group but there are no studies that demonstrate mechanisms that could be involved in the
evolution of this Amphi-Atlantic clade. The present work is the largest cytogenetic analysis for the group published so far. We aimed to provide a study of karyotypic characteristics of the Hymenaea clade, interpreted using
the plastidial trnK phylogenetic reconstruction as background. We analyzed karyological characteristics such as
chromosome number, chromosome size, centromeric position, CMA/DAPI patterns, and banding for 5S and 45S
rDNA. With the present data available, multivariate analyses (PCA) and Phylogenetic Eigenvector Regression
(PVR) demonstrated that centromeric asymmetry and number of 5S rDNA sites may present a strong phylogenetic signal, whereas number of CMA+ sites is associated with geography/climate characteristics. The association of CMA bands and geography has been reported for other legumes of the Caesalpinia group. This study
demonstrates that the use of statistical tools for analyzing karyotypic characteristics can result in more precise
interpretation of evolutionary processes related to structural changes in chromosomes and how these changes
can also be related to environmental conditions.
Descrição
Palavras-chave
Cytogenetics, Systematics, Fabaceae, Phylogenetic eigenvector regression, Multivariate analyses
Citação
SERBIN, Giulia M. et al. Karyological traits related to phylogenetic signal and environmental conditions within the Hymenaea clade (Leguminosae, Detarioideae). Perspectives in Plant Ecology Evolution and Systematics, Amsrterdam, v. 39, p. 125462, 2019. DOI: 10.1016/j.ppees.2019.125462. Disponível em: https://www.sciencedirect.com/science/article/pii/S1433831918300891#!. Acesso em: 15 jun. 2023.