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2 resultados encontrados para: AUTOR: Burgos Hernández, Mireya
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Evolutionary history of Musaceae: ancient distribution and the rise of modern lineages
Burgos Hernández, Mireya (autora) ; Pozo, Carmen (autora) ; González, Dolores (autora) ;
Contenido en: Botanical Journal of the Linnean Society Vol. 189, no. 1 (January 2019), p. 23-35 ISSN: 1095-8339
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Resumen en inglés

We conducted a biogeographic analysis of Musaceae, emphasizing the importance of the fossil record to understand the early evolutionary history of the family. Plastid and nuclear DNA sequences were used to estimate divergence times with a Bayesian uncorrelated, lognormal relaxed-clock approach. Ancestral areas were reconstructed using the statistical dispersal-extinction-cladogenesis method under two models: one including and one excluding the fossil distribution. Molecular dating and integration of biogeographic reconstructions suggest a boreotropical origin for Musaceae across the landmasses of North America+Europe+Asia, with its diversification occurring through the Cretaceous / Palaeogene (K/Pg) (45.9–80.1 Mya; 95% HPD) and subsequent diversification occurring in southern South-east Asia. Comparison of the two models showed that biogeographic analysis based only on living species does not provide a complete reconstruction of the evolutionary history. We hypothesize that North America and Europe may be considered the grave of the more ancient lineages of Musaceae and tropical Asia as the cradle of more recent lineages of the family. The incorporation of fossil information in ancestral reconstructions improves the biogeographical history and expands hypotheses about the early evolution of Musaceae.


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Phylogenetic position of the disjunct species Musa ornata (Musaceae): first approach to understand its distribution
Burgos Hernández, Mireya ; González, Dolores (coaut.) ; Castillo Campos, Gonzalo (coaut.) ;
Contenido en: Genetic Resources and Crop Evolution Vol. 64, no. 8 (December 2017), p. 1889–1904 ISSN: 0925-9864
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Resumen en inglés

Musa L. commonly known as the banana group is one of the most important and oldest food crops of humankind. Among the wild relatives with ornamental interest in the genus, Musa ornata Roxb. shows a disjunct distribution between Asia and North America (Mexico). The wild occurrence of this species in Mexico has led to speculation about the evolutionary relationships with its Asian relatives. This study examined the phylogenetic relationships between intercontinental specimens of this species and, based on registered evidence, explored the more likely hypothesis about the origins of its distribution. The phylogeny of intercontinental specimens, along with other representatives of the same genus, was carried out using three molecular markers (ITS, trnLF, and atpB-rbcL) and applying three phylogenetic reconstruction methods: maximum parsimony, maximum likelihood, and Bayesian inference. The genetic analysis of the combined dataset grouped together all the Mexican and most Asian specimens, but the monophyly of the species was not supported. The relationships suggest that Mexican populations may have originated from an Asian invasion. However, several studies and historical documents suggest the presence of Musa in America long before the arrival of Europeans. Based on its current distribution, phylogenetic evidence, and fossil record, this species’ disjunct distribution could be explained in terms of an ancestral distribution range that encompassed America and Asia, followed by its subsequent restriction to the Old World and a secondary dispersal by humans. However, further studies are necessary to shed more light on the origins of this disjunct distribution.