Cytogeographical Studies in the Genus Arnica (Compositae: Senecioneae). I.

Wolf, Steven J.

doi:10.2307/2442340

Cited by 11 publications

(15 citation statements)

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“…tomentosa. Engell (1970) and Wolf (1980 Locality and voucher tomentosa are in agreement with those previously published by ploid and tetraploid individuals are widely scattered through- Love and Love (1975), Straley (1979), and Wolf (1980). No out previously glaciated areas.…”

Section: Sdsupporting

confidence: 89%

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Morphological, cytological, and flavonoid variability of the Arnica angustifolia aggregate (Asteraceae)

Downie¹

1988

Can. J. Bot.

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The Arnica angustifolia aggregate is a circumpolar taxon previously consisting of a number of geographically distinct infra-specific taxa. Cluster and principal component analyses of 99 populations revealed the aggregate to be best represented by two subspecies: A. angustifolia subsp. angustifolia (a combination of the previously recognized subspecies angustifolia, attenuata, sornborgeri, intermedia, iljinii, and alpina and A. plantaginea) and A. angustifolia subsp. tomentosa. Arnica angustifolia subsp. angustifolia is polymorphic and varied in ploidy level and foliar flavonoid chemistry. No significant differences were found among the means of 14 characters in plants collected from six broadly delimited geographic areas. Four cytotypes (2n = 38, 57, 76, and 95) and seven flavonoid glycosides (five flavonols and two flavones) were discerned. The aggregate is predominantly agamospermous with amphimictic phases in unglaciated Alaska and west central Yukon. Disjunct distributions are probably the result of survival in refugia during the late Wisconsinan.

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Section: Sdsupporting

confidence: 89%

“…Love and Love 1975 Hedberg 1967 Barker 1967 Zhukova 1966 Zhukova 1967Sokolovskaya 1970 Zhukova and Petrovsky 1976Zhukova et al 1977Zhukova and Petrovsky 1972Zhukova et al 1973Love and Love 1975Zhukova 1964Wolf 1980Wolf 1980Wolf 1980Love and Love 1975Straley 1979 Acknowledgments This work is part of a doctoral dissertation submitted to the…”

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confidence: 99%

Morphological, cytological, and flavonoid variability of the Arnica angustifolia aggregate (Asteraceae)

Downie¹

1988

Can. J. Bot.

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“…Arnica has a circumpolar northern hemispheric distribution, with most species restricted to western North America. Hybridization, polyploidy, and agamospermy have been proposed to be common within Arnica , which is reflected in complex and diverse patterns of morphological variation (e.g., Straley, 1980; Wolf, 1980; Wolf and Denford, 1984). In the last revision of the genus by Maguire (1943), Arnica was divided into five subgenera.…”

Section: Introductionmentioning

confidence: 99%

Secondary chemistry and ribosomal DNA data congruencies in Arnica (Asteraceae)

et al. 2009

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To investigate possible congruencies between DNA sequence data and secondary chemistry, we compared nuclear ribosomal DNA (nrDNA) sequence data, sesquiterpene lactone (STL) contents, and cytometric data from 35 accessions of 16 Arnica (Asteraceae) species and two outgroup taxa (Layia hieracioides and Madia sativa), using phylogenetic inference and principal component analysis (PCA). Several groups supporting multiple accessions of the same species (of A. montana, A. longifolia, A. gracilis, and A. chamissonis) are congruent between the phylogenetic trees based on nrDNA and STL data. Sesquiterpene lactone profiles were found to be highly consistent within multiple samples of A. montana and A. longifolia respectively. Moreover, sesquiterpene lactone data support subspecies classifications of A. chamissonis and A. parryi, with additional support from DNA sequence data and cytometric data. Morphology, STL data (PCA), cytometric data and DNA sequence data suggest a hybrid origin of one accession (A. gracilis · longifolia). In A. gracilis, A. latifolia, and Layia hieracioides, previously not investigated for STLs, we found large amounts of xanthalongin derivatives. This is the first time STLs have been reported from subtribe Madiinae.

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“…The widespread distribution of agamospermous polyploids compared with the restricted range of their diploid ancestors has been noted in various taxonomic groups (Babcock & Stebbins 1938; Gustaffson 1947; Müntzing 1954; Stebbins 1971; Sullivan 1976; Grant 1981; Watanabe 1986). Bayer and Stebbins (1981, 1983) and Wolf (1980) explained this distributional pattern (which was confirmed in the genera Antennaria and Arnica growing in areas severely affected by successive advances and recessions of Pleistocene ice sheets) in the following way. The ancestral diploids were probably restricted to small southern areas at the end of the last glaciation.…”

Section: Resultsmentioning

confidence: 55%

Mexican species of the genus Stevia (Eupatorieae, Asteraceae): Chromosome numbers and geographical distribution

Watanabe¹,

Yahara²,

Soejima³

et al. 2001

Plant Species Biology

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Chromosome numbers from 244 accessions representing 73 species, five varieties and two putative species hybrids in Mexican Stevia are reported with comments on agamospermy, cytogeography and chromosomal evolution. The chromosome numbers of 47 species and two varieties were counted for the first time. Counts of 12 species and two varieties were new cytotypes, or differed from all previously reported numbers for the same species. B chromosomes were found in 16 species and two varieties. All species of shrubs or shrublets were sexual diploids (2n = 24). Perennial herbs were diploids or polyploids based on x = 11 or 12 and the widespread prevalence of agamospermous polyploids was revealed. Chromosome numbers of annual herbs varied from 2n = 24 to 2n = 8. The cytogeographical survey revealed five distributional patterns of agamic complexes based on the relative abundance of polyploids compared to their diploid ancestors. The wider distributional range (extending to northern and inland areas) of some agamospermous polyploids have been achieved by recent colonization accompanying climatic warming after the last glaciation. This has occurred even in lower latitudes such as Mexico, due to more successful founder population reproduction and the acceleration of seed dispersal, as well as the creation of new and open habitats by human activities.

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Cytogeographical Studies in the Genus Arnica (Compositae: Senecioneae). I.

Cited by 11 publications

References 0 publications

Morphological, cytological, and flavonoid variability of the Arnica angustifolia aggregate (Asteraceae)

Morphological, cytological, and flavonoid variability of the Arnica angustifolia aggregate (Asteraceae)

Secondary chemistry and ribosomal DNA data congruencies in Arnica (Asteraceae)

Mexican species of the genus Stevia (Eupatorieae, Asteraceae): Chromosome numbers and geographical distribution

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