Molecular systematics of the tribe cimicifugeae and allied genera in the Ranunculaceae.
Item
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Title
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Molecular systematics of the tribe cimicifugeae and allied genera in the Ranunculaceae.
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Identifier
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AAI9315464
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identifier
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9315464
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Creator
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Hasegawa, Ikue.
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Contributor
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Co-Advisers: Dennis Stevenson | Tetsuo Koyama
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Date
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1993
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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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Biology, Botany | Biology, Genetics
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Abstract
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The Phylogenetic analysis of the tribe cimicifugeae including three monotypic Asian genera (Anemonopsis, Beesia, and Souliea) and allied genera in the Ranunculaceae inferred from rbcL sequences was conducted for the first time.;The Ranunculaceae Juss. is a large and complex family, widely distributed, especially in the temperate and boreal regions of the northern hemisphere (Cronquist, 1981). Many species of Ranunculaceae are commonly used for horticultural and medicinal purposes and thus one might expect this large family to be a thoroughly studied and understood group of plants. However, there have been different taxonomic views among taxonomists regarding the classification of Ranunculaceae. These differing taxonomic views are caused in part by the lack of data on this archaic and heterogenous group of plants, which are morphologically simple, but highly variable. Therefore, it is difficult to find good conservative morphological characters and the group is in great need of detailed systematic re-examination employing modern taxonomic methods. This study is to obtain additional characters (rbcL sequence) for resolving incongruencies between phylogenies generated in previous morphological, cytological and serological studies and to perform phylogenetic analyses to provide a comprehensive and broadly based assessment of evolutionary relationships of the Cimicifugeae.;1333 bp nucleotide sequences of the rbcL gene were obtained for 15 genera of the Ranunculaceae and two outgroup families. A total of 247 variable nucleotide positions were identified, 120 of which were phylogenetically informative. Phylogenetic analyses of the rbcL data generated three equally parsimonious trees with a consistency index of 0.641. The clade that correspond to the tribe Cimicifugeae was well supported and showed a new alignment of Beesia and Anemonopsis as a sister group. The traditional view of Actaea and Cimicifuga as a monophyletic taxa is not shown when an Asian monotypic genus, Souliea is included in a study. A new alignment is Souliea is closer than Actaea to Cimicifuga. The other genera in this study were congruent with chromosome information with respect to the tribal circumscription in the Ranunculaceae.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
