@ARTICLE{TreeBASE2Ref18426, author = {D. R. Morgan and R. L. Korn and Spencer L. Mugleston}, title = {Insights into reticulate evolution in Machaerantherinae (Asteraceae: Astereae): 5S ribosomal RNA spacer variation, estimating support for incongruence, and constructing reticulate phylogenies}, year = {2009}, keywords = {}, doi = {10.3732/ajb.0800308}, url = {}, pmid = {}, journal = {American Journal of Botany}, volume = {96}, number = {}, pages = {920--932}, abstract = {Although reticulate evolution has been a frequent occurrence during the history of plants, determining how it has contributed to plant evolution will require analyzing many nuclear loci and developing effective analytical methods. The objective of this study was to make progress toward meeting these requirements in the evolutionarily complex subtribe Machaerantherinae. The 5S ribosomal RNA (rRNA) spacer was investigated to characterize its structure and variation. Analysis of the spacer supported relationships that were mostly the same as those supported by ITS and ETS sequence data. Two methods were used to estimate support for 11 occurrences of incongruence between 5S/ITS/ETS and cpDNA datasets. The best-supported examples were used to construct reticulate phylogenies, which hypothesized reticulate histories for five species and groups. For three of them, 5S and ITS/ETS evidence supported the same or similar relationships, indicating that these two regions of the nuclear genome were descended from the same ancestor or from two closely related ancestors, with cpDNA coming from a more distantly related ancestor. 5S and ITS/ETS evidence disagreed on the relationships of Arida riparia, suggesting that its ITS/ETS region has come from one ancestor, and its 5S region and cpDNA from a different ancestor.} }

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