Chromosome Numbers of Some Western Canadian Plants

Taylor, Roy L.; Brockman, Ronald P.

doi:10.1139/b66-117

Cited by 42 publications

(13 citation statements)

References 9 publications

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“…The haploid chromosome number "n"-due to presence of two ploidy levels, "x" is the proper term-of big sagebrush has been intensively studied (Barker and McKell 1986;Kelsey and others 1975;others 1979, 1981;McArthur and Sanderson 1999;McArthur and Welch 1982;Sanderson and others 1989;Stahevitch and Wojtas 1988;Taylor and Brockman 1966;Taylor and others 1964;. The results of all these studies agree that the base number of chromosomes for big sagebrush is 9 (n = x = 9; fig.…”

Section: Chromosome Number _____________________________________________mentioning

confidence: 80%

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Big sagebrush: A sea fragmented into lakes, ponds, and puddles

Welch¹

2005

107

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Pioneers traveling along the Oregon Trail from western Nebraska, through Wyoming and southern Idaho and into eastern Oregon, referred to their travel as an 800 mile journey through a sea of sagebrush, mainly big sagebrush (Artemisia tridentata). Today approximately 50 percent of the sagebrush sea has given way to agriculture, cities and towns, and other human developments. What remains is further fragmented by range management practices, creeping expansion of woodlands, alien weed species, and the historic view that big sagebrush is a worthless plant. Two ideas are promoted in this report: (1) big sagebrush is a nursing mother to a host of organisms that range from microscopic fungi to large mammals, and (2) many range management practices applied to big sagebrush ecosystems are not science based.

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Section: Chromosome Number _____________________________________________mentioning

confidence: 80%

“…5.2) and 2n = 4x = 36 ( fig. 5.3) (Barker and McKell 1986;Kelsey and others 1975;others 1979, 1981;McArthur and Sanderson 1999;Sanderson and others 1989;Stahevitch and Wojtas 1988;Taylor and Brockman 1966;Taylor and others 1964;). …”

Section: Chromosome Number _____________________________________________mentioning

confidence: 97%

Big sagebrush: A sea fragmented into lakes, ponds, and puddles

Welch¹

2005

107

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“…4), only a single consensus sequence from each individual was used in the network reconstruction for simplicity Genetica (2007) 130:19-34 29 Based on a cladistic analysis of morphological characters, Murrell (1994) divided the dwarf dogwoods into five lineages: Cornus canadensis, C. unalaschkensis, and C. suecica as distinct species, respectively, and C. canadensis > C. suecica and C. suecica > C. canadensis as two informal categories. Cornus unalaschkensis was considered a tetraploid derived from hybridization between two diploid species (C. canadensis and C. suecica) (Dermen 1932;Taylor and Brockman 1966;Clay and Nath 1971;Bain and Denford 1979). Cornus canadensis > C. suecica was considered the product of backcrossing of hybrids to C. canadensis, and morphologically more similar to C. canadensis.…”

Section: Discussionmentioning

confidence: 99%

Evolutionary patterns in the antR-Cor gene in the dwarf dogwood complex (Cornus, Cornaceae)

et al. 2006

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The evolutionary pattern of the myc-like anthocyanin regulatory gene antR-Cor was examined in the dwarf dogwood species complex (Cornus Subgenus Arctocrania) that contains two diploid species (C. canadensis and C. suecica), their putative hybrids with intermediate phenotypes, and a tetraploid derivative (C. unalaschkensis). Full-length sequences of this gene ( approximately 4 kb) were sequenced and characterized for 47 dwarf dogwood samples representing all taxa categories from 43 sites in the Pacific Northwest. Analysis of nucleotide diversity indicated departures from neutral evolution, due most likely to local population structure. Neighbor-joining and haplotype network analyses show that sequences from the tetraploid and diploid intermediates are much more strongly diverged from C. suecica than from C. canadensis, and that the intermediate phenotypes may represent an ancestral group to C. canadensis rather than interspecific hybrids. Seven amino acid mutations that are potentially linked to myc-like anthocyanin regulatory gene function correlate with petal colors differences that characterize the divergence between two diploid species and the tetraploid species in this complex. The evidence provides a working hypothesis for testing the role of the gene in speciation and its link to the petal coloration. Sequencing and analysis of additional nuclear genes will be necessary to resolve questions about the evolution of the dwarf dogwood complex.

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“…In the most comprehensive study to date, Bain and Denford (1979) found evidence of polyploidy in C. unalaschkensis using root tip squashes for ten populations and guard cell size for five populations. However, Taylor and Brockman (1966) reported 2n = 22 for C. unalaschkensis, and Dermen (1932) and Clay and Nath (1971) reported chromosome numbers of 2n = 44 for C. canadensis. Polyploid taxa are often larger than their diploid relatives (Giles 1942;Grant 1981).…”

Section: Methodsmentioning

confidence: 99%

“…Using the results from this study, further work needs to be done in several areas. First, size variation, the existence of a putative tetraploid, and the conflicting chromosome counts of Dermen (1932), Taylor and Brockman (1966), Clay and Nath (1971), and Bain and Denford (1979) indicate that ploidy differences within and between species need to be investigated. Second, electrophoretic and/or molecular studies are needed to examine populational level variation.…”

Section: Cornus Canadensis > -C Suecica (Group B) Is the Product Of mentioning

confidence: 99%

Dwarf Dogwoods: Intermediacy and the Morphological Landscape

Murrell¹

1994

Systematic Botany

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Chromosome Numbers of Some Western Canadian Plants

Cited by 42 publications

References 9 publications

Big sagebrush: A sea fragmented into lakes, ponds, and puddles

Big sagebrush: A sea fragmented into lakes, ponds, and puddles

Evolutionary patterns in the antR-Cor gene in the dwarf dogwood complex (Cornus, Cornaceae)

Dwarf Dogwoods: Intermediacy and the Morphological Landscape

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