Systematics of lecythidoideae (lecythidaceae) with emphasis on Bertholletia, Corythophora, Eschweilera, and Lecythis
Item
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Title
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Systematics of lecythidoideae (lecythidaceae) with emphasis on Bertholletia, Corythophora, Eschweilera, and Lecythis
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Identifier
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d_2009_2013:3e7b6ff50b5d:10602
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identifier
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10879
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Creator
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Huang, Ya-Yi,
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Contributor
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Scott A. Mori | Lawrence M. Kelly
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Date
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2010
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Language
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English
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Publisher
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City University of New York.
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Subject
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Botany | Systematic biology | Bertholletia | Corythophora | Eschweilera | Lecythidaceae | Lecythis | Phylogeny
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Abstract
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Phylogenetic analyses based on morphological and DNA sequence data were generated to test the monophyly of Eschweilera and Lecythis and to investigate the relationships of these two genera and their close relatives (Bertholletia and Corythophora ). The final results were applied to questions of taxonomic rearrangements and character evolution in traits related to pollination.;A cladistic analysis based on morphology indicates that Bertholletia, Corythophora, Eschweilera, and Lecythis form a clade (the Bertholletia clade), but the resolution within the clade is too poor to elucidate the phylogenetic relationships among the genera. Nonetheless, the data support the monophyly of Corythophora. Eschweilera is divided into two clades: Eschweilera section Tetrapetala and Eschweilera s.s. Whether or not the two clades form a clade remains as unresolved. Lecythis is not resolved as monophyletic, but each of the Sections Corrugata, Pisonis, and Poiteaui is monophyletic.;A combined analysis based on morphology and nuclear ITS and plastid ndhF, trnL-F, and trnH-psbA sequence data was conducted to improve the resolution of the phylogenetic tree. The results support the generic circumscriptions of Bertholletia and Corythophora based on morphology, but suggest the revision of Eschweilera and Lecythis. Eschweilera is paraphyletic and divided into three clades: the Eschweilera section Tetrapetala clade, the Eschweilera andina clade, and the core Eschweilera clade. Lecythis is polyphyletic and consists of five clades: the Lecythis s.s. clade, the Pachylecythis clade, the Lecythis chartacea clade, the Holopyxidium clade, and the Section Corrugata clade. Based on the results of these analyses, Section Tetrapetala clade merits recognition as an independent genus and should be segregated from Eschweilera. On the other hand, the five clades of Lecythis are distinct from each other and should be recognized as five separate genera.;Androecial evolution inferred from the resulting phylogeny demonstrates that features such as floral zygomorphy, closed androecia, coiled ligules, and the production of nectar are homoplasious. Evolution of these characters most likely is because of the adaptation in response to pollinator shift and does not simply represent a process of morphological transformation from a simpler to a more complicated structure as previously suggested.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Biology
