A phylogenetic analysis of the aureoidSenecio (Asteraceae) complex based on ITS sequence data

Bain, John; Jansen, Robert K.

doi:10.1007/bf00989297

Cited by 56 publications

(37 citation statements)

References 23 publications

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“…However, the percentage of phylogenetically informative characters in the two spacers, 45.8%, and percent maximum sequence divergence, 28.8%, within Viola are higher than values for most genera and are comparable to species within Arceuthobium (Nickrent et al 1994) and generic segregates of Senecio s. l. (Bain and Jansen 1995). ITS sequence variation in Viola shows uncommonly broad phylogenetic utility in resolving relationships among infrageneric groups across the genus, relationships within infrageneric groups, and even among infraspecific taxa and populations of particular species.…”

Section: Sequence Characteristicsmentioning

confidence: 80%

Evolution and Biogeography of the Woody Hawaiian Violets (Viola, Violaceae): Arctic Origins, Herbaceous Ancestry and Bird Dispersal

Ballard

Sytsma

2000

Evolution

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Abstract. Specialists studying the genus Viola have consistently allied the Hawaiian violets comprising section Nosphinium-most of which are subshrubs or treelets-with putatively primitive subshrubs in certain South American violet groups. Hawaiian violets also possess inflorescences, a floral disposition otherwise found only in other genera of the Violaceae, thus strengthening the hypothesis of a very ancient origin for the Hawaiian species. A survey of phylogenetic relationships among infrageneric groups of Viola worldwide using nuclear rDNA internal transcribed spacer (ITS) sequences revealed a dramatically different biogeographic origin for the Hawaiian violets: A monophyletic Hawaiian clade was placed in a close sister relationship with the amphi-Beringian tundra violet, V. langsdorffii s. l., in a highly derived position. This remarkable and unforeseen relationship received strong clade support values across analyses, and monophyly of the Hawaiian lineage was further indicated by a unique 26-base-pair deletion in section Nosphinium. The high polyploid base chromosome number (n Ӎ 40) in the Hawaiian violets relates them to Alaskan and eastern Siberian populations in the polyploid V. langsdorffii complex. More than 50 species of the 260 allochthonous birds wintering in the Hawaiian Islands are found to breed in the Arctic, occupying habitats in which individual birds might have encountered ancestral V. langsdorffii populations and served as dispersers to the central Pacific region. Acquisition of derived morphological traits (e.g., arborescence and inflorescences), significance of a confirmed Arctic origin for a component of the Hawaiian flora, and the likelihood of other ''cryptic'' Arctic elements in the Hawaiian flora deserving independent molecular phylogenetic corroboration are discussed. Extraordinary geographic isolation of the Hawaiian archipelago (more than 3500 km from the nearest continent), a diverse flora of nearly 1000 native angiosperm and approximately 180 pteridophyte species, and an unparalleled 86% endemism in angiosperms and about 70% in pteridophytes (Wagner et al. 1990;Sakai et al. 1995;Wagner and Funk 1995) make the Hawaiian flora one of the most tantalizing foci for evolutionary inquiry. Earlier explicit inferences on the minimum number of successful colonizations responsible for the modern-day Hawaiian vascular flora (Fosberg 1948;Carlquist 1970) have recently been updated to 291 putative events for angiosperms and an additional 115 for pteridophytes (Wagner 1991;Sakai et al. 1995). The Hawaiian flora thus offers unique opportunities for biogeographic and evolutionary studies of oceanic island systems (Carlquist 1965(Carlquist , 1974Wagner and Funk 1995;Givnish 1998). Comprehensive higher-level phylogenetic studies including endemic Hawaiian plants have the potential to elucidate the biogeographic origins of those plant groups and reevaluate previous hypotheses of dispersal and character evolution. Well-established geologic dates pinpoint the time of origin of islands that formed ''c...

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Section: Sequence Characteristicsmentioning

confidence: 80%

Evolution and Biogeography of the Woody Hawaiian Violets (Viola, Violaceae): Arctic Origins, Herbaceous Ancestry and Bird Dispersal

Ballard

Sytsma

2000

Evolution

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“…Parsimony analysis involved heuristic searches conducted with PAUP version 4.0b4a (Swofford, 1999) with TBR branch swapping and character states specified as unordered and unweighted. The indels were coded as fifth base, following the now generally accepted trend of saving the potential phylogenetic information of shared indels (Sun et al, 1994;Bain and Jansen, 1995;Samuel et al, 1998). All most parsimonious trees (MPTs) were saved.…”

Section: Phylogenetic Analysismentioning

confidence: 99%

Tribal and Subtribal Delimitation and Phylogeny of the Cardueae (Asteraceae): A Combined Nuclear and Chloroplast DNA Analysis

Garcia‐Jacas

Garnatje

Susanna

et al. 2002

Molecular Phylogenetics and Evolution

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“…The possibility that the three areas showing particularly high levels of intrapopulational variation (southwestern Alberta, Alaska-Yukon, and ArizonaNew Mexico) are regions where the ranges of distinct haplotype lineages have converged is being examined more thoroughly (Golden et al, 1998). Although intrageneric taxa above the species level have been routinely recognized in Packera based on morphology (Rydberg, 1900;Greenman, 1915Greenman, , 1916Greenman, , 1917Greenman, , 1918Barkley, 1978), recent molecular studies have demonstrated a high degree of genetic uniformity among Packera species in both the internal transcribed spacer (ITS) region of nuclear rDNA (Bain and Jansen, 1995) and the chloroplast DNA (Bain and Jansen, 1996).…”

mentioning

confidence: 99%

“…Since Packera is a New World genus this result was unexpected, but the authors cautioned that it may be the result of incomplete sampling within the outgroups. The three North American outgroups chosen by Bain and Jansen (1995) for their ITS analysis of Packera phylogeny (Senecio actinella and S. lugens from the Senecioninae and Tephroseris atropurpurea from the Tussilagininae) were all ultimately not considered closely related to Packera, based on high sequence divergence values (37-50%).…”

mentioning

confidence: 99%

A Phylogeny of Packera (Senecioneae; Asteraceae) Based on Internal Transcribed Spacer Region Sequence Data and a Broad Sampling of Outgroups

Bain

Golden

2000

Molecular Phylogenetics and Evolution

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A phylogenetic analysis of the aureoidSenecio (Asteraceae) complex based on ITS sequence data

Cited by 56 publications

References 23 publications

Evolution and Biogeography of the Woody Hawaiian Violets (Viola, Violaceae): Arctic Origins, Herbaceous Ancestry and Bird Dispersal

Evolution and Biogeography of the Woody Hawaiian Violets (Viola, Violaceae): Arctic Origins, Herbaceous Ancestry and Bird Dispersal

Tribal and Subtribal Delimitation and Phylogeny of the Cardueae (Asteraceae): A Combined Nuclear and Chloroplast DNA Analysis

A Phylogeny of Packera (Senecioneae; Asteraceae) Based on Internal Transcribed Spacer Region Sequence Data and a Broad Sampling of Outgroups

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