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TRIBAL PLACEMENT OF MARSHALLIA (ASTERACEAE) USING CHLOROPLAST DNA RESTRICTION SITE MAPPING
Author(s) -
Watson Linda E.,
Jansen Robert K.,
Estes James R.
Publication year - 1991
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1991.tb14510.x
Subject(s) - biology , monophyly , paraphyly , clade , heliantheae , botany , chloroplast dna , restriction site , evolutionary biology , phylogenetics , asteraceae , genetics , restriction enzyme , dna , gene
The examination of morphological traits has failed to resolve the tribal placement of Marshallia. Suggested relationships for this anomalous genus have, at various times, included Eupatorieae, Heliantheae, Vemonieae, and Inuleae. Chloroplast DNA restriction site mapping, using Bamadesiinae (Mutisieae) as the outgroup, revealed 981 restriction site mutations, 332 of which were phylogenetically informative, for 60 genera representing 15 tribes of Asteraceae. Wagner parsimony produced 36 equally parsimonious tress of 729 steps, and Dollo parsimony produced 34 equally parsimonious trees of 759 steps. Monophyletic groups, resulting from the Wagner analysis, were further tested with the bootstrap method. The placement of Marshallia in the Heliantheae‐Tageteae‐Coreopsideae‐Eupatorieae complex was consistent for all trees produced. Tageteae and Coreopsideae form the sister group to paraphyletic Heliantheae, with Marshallia sharing its most recent common ancestor with Galinsoga, Palafoxia , and Bahia. The Eupatorieae form a monophyletic clade that is derived from helianthoid ancestors.