Molecular phylogenetic insights into the evolution of Eriosema (Fabaceae): a recent tropical savanna-adapted genus

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Candido, Elisa Silva ^[1] ; Vatanparast, Mohammad ^{[2, 3]} ; de Vargas, Wanderleia ^[4] ; Bezerra, Luisa M. P. A. ^[4] ; Lewis, Gwilym P. ^[5] ; Mansano, Vidal F. ^{[1, 6]} ; Simoes, Andre O. ^[1] ; Silva, Marcos J. ^[7] ; Stirton, Charles ^[8] ; Tozzi, Ana Maria G. A. ^[1] ; Fortuna-Perez, Ana Paula ^{[1, 4]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Programa Posgrad Biol Vegetal, BR-13083862 Campinas, SP - Brazil

^[2] Univ Copenhagen, Dept Geosci & Nat Resource Management, Rolighedsvej 23, DK-1958 Frederiksberg C - Denmark

^[3] Smithsonian Inst NMNH, Dept Bot, US Natl Herbarium US, MRC 166, 10th & Constitut Ave, Washington, DC 20560 - USA

^[4] Univ Estadual Paulista, Inst Biociencias, Programa Posgrad Ciencias Biol Bot, Dept Bot, BR-18618000 Botucatu, SP - Brazil

^[5] Royal Bot Gardens, Comparat Plant & Fungal Biol Dept, Richmond TW9 3AB, Surrey - England

^[6] DIPEQ, Inst Pesquisas Jardim Bot Rio de Janeiro, Rua Pacheco Leao 915, BR-22460030 Rio De Janeiro, RJ - Brazil

^[7] Univ Fed Goias, Inst Ciencias Biol, Dept Bot, CP 131, BR-74001970 Goiania, Go - Brazil

^[8] Univ Cape Town, Dept Biol Sci, Bolus Herbarium, ZA-105 Rondebosch - South Africa

• Tipo de documento: Artigo Científico
• Fonte: Botanical Journal of the Linnean Society; v. 194, n. 4, p. 439-459, DEC 2020.
• Citações Web of Science: 1

Resumo

Eriosema comprises c. 150 species and has a pantropical distribution and two centres of diversity, Africa and America. The species occur in tropical savannas and grasslands, including the cerrado in Brazil. They have adapted to these environments by developing specialized underground organs, and an abundance of trichomes. Here we present the first comprehensive molecular phylogenetic analysis of Eriosema, including species from its entire distribution range and generating 391 new DNA sequences. We sampled 140 species from nine genera of Cajaninae, of which 94 (60% of the genus) were Eriosema. Our analyses were based on the nuclear ITS and plastid rp132 and trnQ regions, and used maximum likelihood and Bayesian phylogenetic analyses of individual and combined data sets. In all analyses, Eriosema was resolved as monophyletic, but its interspecific relationships are not well resolved. Rhynchosia is not monophyletic, and some African Rhynchosia spp. emerged together as sister to Eriosema. Our study supports the monophyly of Adenodolichos, Dunbaria, Flemingia and Cajanus, but Chrysoscias and Bolusafra formed a dade that is sister to a group of Rhynchosia spp. Paracalyx was resolved as paraphyletic and nested among African Rhynchosia spp. Divergence time analysis suggested that the Eriosema lineages diverged 6.5-10.7 Mya. Two major lineages have diversified in Eriosema, one including most of the African species (4.41-6.68 Mya), the other mainly composed of the South American cerrado species (3.56-5.78 Mya). These results revealed that Eriosema is a recent and tropical savanna-adapted group, and its diversification occurred in the late Miocene in parallel with the expansion of C-4 grasslands. (AU)

• Processo FAPESP: 15/13386-0 - Estudos taxonômicos, filogenéticos e biogeográficos no gênero Eriosema (DC.) Desv. (Leguminosae, Papilionoideae, Phaseoleae)
• Beneficiário: Ana Paula Fortuna Perez
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/53002-5 - Estudos filogenéticos e biogeográficos no gênero Eriosema (DC.) Desv. (Leguminosae, Papilionoideae, Phaseoleae)
• Beneficiário: Ana Paula Fortuna Perez
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado