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. 2024 May;137(3):377-393.
doi: 10.1007/s10265-024-01523-6. Epub 2024 Feb 19.

From forest to savanna and back to forest: Evolutionary history of the genus Dimorphandra (Fabaceae)

Vinicius Delgado da Rocha  1 , Thaís Carolina da Silva Dal'Sasso  1   2 , Christina Cleo Vinson Williams  3 , Marcelo Fragomeni Simon  4 , Marcelo Leandro Bueno  5 , Luiz Orlando de Oliveira  6
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From forest to savanna and back to forest: Evolutionary history of the genus Dimorphandra (Fabaceae)

Vinicius Delgado da Rocha et al. J Plant Res. 2024 May.

Abstract

The tree genus Dimorphandra (Fabaceae), which contains 26 species divided into three subgenera, was studied using DNA sequence data from six chloroplast genome regions (cpDNA) and the nuclear internal transcribed spacer (ITS). The analyses, which included Bayesian phylogenies and haplotype networks, ancestral area reconstructions, and ecological niche modeling, allowed for exploring the evolutionary history of Dimorphandra. Within the subgenus Phaneropsia, the cpDNA sequence data were more closely-related to species from the genus Mora, while the ITS sequence data displayed a closer phylogenetic relationship with the subgenus Pocillum. This incongruence may be due to incomplete lineage sorting associated with ancient polymorphisms. The Amazonian Dimophandra lineages were highly polymorphic and divergent, while those from the Cerrado and the Atlantic Forest had low levels of polymorphisms. The Amazon likely gave rise to the Dimophandra lineage that produced the Cerrado species, while a Cerrado lineage likely gave rise to the Atlantic Forest species. Habitat shifts were identified as a key factor in shaping the late evolutionary history of Dimorphandra.

Keywords: Amazon; Atlantic Forest; Cerrado; Evolution; Habitat shifts; Molecular phylogeny.

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