A Cytotaxonomic Study in the Genus Eupatorium

Grant, W. F.

doi:10.1002/j.1537-2197.1953.tb06548.x

Cited by 27 publications

(5 citation statements)

References 15 publications

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“…Differences in chromosome size and shape have been mentioned in the studies of Eupatorieae by Grant (1953) and Gaiser (1953Gaiser ( , 1954. Grant reported two size ranges for chromosomes.…”

Section: Chromomentioning

confidence: 95%

“…This is in contrast to the present polyploid derivatives based on x = 10, 11, and 17, which are rather similar morphologically to their diploid ancestors. On the other hand, some workers (Grant, 1953;Turner & King, 1964) have postulated that species with the ancestral base number of x = 5 and 4 might have given rise through successive allopolyploidy to those taxa with base numbers of 9, 10, and 17. It is difficult to imagine, however, that the Costa Rican species of Fleischmannia having n = 4 are primitive because of their specialized annual habit and weediness.…”

Section: ]mentioning

confidence: 99%

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Chromosomal Cytology and Evolution in Eupatorieae (Asteraceae)

Watanabe¹,

King²,

Yahara³

et al. 1995

Annals of the Missouri Botanical Garden

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Reports of 68 new chromosome counts attributed to 53 species from 25 genera of Eupatorieae of the Asteraceae, based mostly on determinations of mitotic materials, include first counts for 2 genera (Acanthostyles and Lepidesmia) and 14 species and new reports for 8 species. B chromosomes are reported for 4 genera and 12 species. Karyotype analyses made on 20 species of Eupatorieae and one species of Heliantheae showed that total karyotypic lengths of the taxa with n = 16-19 of helianthoid and eupatorioid taxa are comparable to those of some eupatorioid taxa with n = 10. This is contrary to the previous hypothesis that the higher chromosome numbers n = 16-19 were derived from n = 10 by polyploidization followed by dysploid loss. Cytological data supplement and are consistent with the following conclusions predicted from molecular phylogenetical and biochemical data: (1) The ultimate base number of Eupatorieae is 17, and the lower numbers are derived by successive dysploid reductions; (2) A reduction in chromosomal and total karyotypic length accompanied by evolutionary advancement has been revealed for some genera and species within this tribe; (3) A high base number of x = 17 in Eupatorieae is considered to be derived directly from one of the members of Heliantheae with n = 17 to 19.

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“…Differences in chromosome size and shape have been mentioned in the studies of Eupatorieae by Grant (1953) and Gaiser (1953Gaiser ( , 1954. Grant reported two size ranges for chromosomes.…”

Section: Chromomentioning

confidence: 95%

Section: ]mentioning

confidence: 99%

Chromosomal Cytology and Evolution in Eupatorieae (Asteraceae)

Watanabe¹,

King²,

Yahara³

et al. 1995

Annals of the Missouri Botanical Garden

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show abstract

“…General Considerations Gaiser (1954) Differences in chromosome size and shape have been mentioned in the studies of Grant ( 1953) and Gaiser (1953Gaiser ( , 1954. While dealing with Eupatorium s. lat.…”

Section: Ahsthactmentioning

confidence: 99%

“…Such numbers supposedly result from hybridization between the different ploidy levels that are common in the genus, and are perpetuated by apomixis. Grant ( 1953) noticed the small size of the chromosomes of Conoclinium coelestinum (L.) DC., but related forms have not been studied for this characteristic.…”

Section: Chromosome Numbers and Piiylogeny In The Eupatorieaementioning

confidence: 99%

Chromosome Numbers in Compositae. XIII. Eupatorieae

King¹,

Kyhos²,

Powell³

et al. 1976

Annals of the Missouri Botanical Garden

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“…Love and Love (1942) and Felfoldy (1947) reported the chromosome number of E. cannabinum. Recently, Grant (1953) made a precise investigation of chromosome numbers in thirty-two species, nine varieties and three forms of American Eupatorium.…”

mentioning

confidence: 99%