EKU Faculty and Staff Scholarship


Molecular analysis of Solidaster cv. Lemore, a hybrid goldenrod (Asteraceae)

Author ORCID Identifier

Patrick CalieORCID iD iconhttps://orcid.org/0000-0003-3705-4742


Biological Sciences

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Analysis of nuclear nbosomal ITS and ETS sequence data was used to assess the relationships of the garden ornamental Solidaster cv Lemore, a cultivar that was at one time believed to be an intergeneric hybrid (Solidago × Aster). Part of the analysis involved assessment of the generic placement of one of its putative parents, the Upland White Aster, Solidago ptarmicoides Because of its superficial external appearance this species is still often treated as an Aster, although there is evidence from several sources that suggests it should be classified within Solidago. Phylogenetic analysis of the combined ITS and ETS sequence data showed that there was strong support for the inclusion of S. ptarmicoides within Solidago, based on its placement in a well supported clade composed of all other sampled species of the genus. The ITS sequence data of Solidaster showed evidence of a hybrid origin based on the presence of several intraindividual base pair polymorphisms. Cloning experiments recovered two different individual ITS sequences, one identical to that obtained from S. ptarmicoides and a second that matched sequences obtained for S canadensis Thus DNA sequence data suggested that Sohdaster cv. Lemore is a hybrid goldenrod that involved a cross between S. ptarmicoides and S. canadensis The data further indicated that another possible candidate, Euthamia graminifolia, is not a parent of Solidaster. Also notable was the striking lack of sequence divergence for ITS and ETS among species of Solidago, suggesting that estimation of phylogenetic relationships within the genus will require more rapidly evolving markers.

Journal Title

Journal of the Botanical Research Institute of Texas

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