Isozyme evidence and phenetic relationships among species in Aster section Biotia (Asteraceae)

Aster section Biotia is an eastern North American group of asters having a base chromosome number of x = 9. Phenetic analyses of isozyme gene frequency data show that the species native to the eastern deciduous forest region, Aster divaricatus (2n = 18), A. chlorolepis (2n = 36), A. schreberi (2n =...

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Bibliographic Details
Published in:Rhodora 1991-07, Vol.93 (875), p.205-225
Main Authors: Lamboy, W.F. (Cornell University, Geneva, NY), Nickrent, D.L, Jones, A.G
Format: Article
Language:English
Subjects:
Alleles
AMERICA DEL NORTE
AMERIQUE DU NORD
ASTER
Biological and medical sciences
Biological taxonomies
CHEMICAL COMPOSITION
CHEMOTAXONOMY
CHIMIOTAXONOMIE
CHROMOSOME NUMBER
COMPOSICION QUIMICA
COMPOSITION CHIMIQUE
Diploidy
DISTRIBUCION NATURAL
DISTRIBUTION NATURELLE
Enzymes
FILOGENIA
Fundamental and applied biological sciences. Psychology
Gene frequency
Genetic loci
GEOGRAPHICAL DISTRIBUTION
Hybridity
ISOENZIMAS
ISOENZYME
ISOENZYMES
KEYS
NATURAL DISTRIBUTION
NOMBRE CHROMOSOMIQUE
NORTH AMERICA
NUMERO DE CROMOSOMAS
PHYLOGENIE
PHYLOGENY
Plant cytology, morphology, systematics, chorology and evolution
Ploidies
PLOIDY
Polyploidy
QUIMIOTAXONOMIA
Spermatophyta
Systematics (diagnosis, chromosome numbers)
Taxa
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Description
Summary:Aster section Biotia is an eastern North American group of asters having a base chromosome number of x = 9. Phenetic analyses of isozyme gene frequency data show that the species native to the eastern deciduous forest region, Aster divaricatus (2n = 18), A. chlorolepis (2n = 36), A. schreberi (2n = 54), and A. macrophyllus (2n = 72) are very closely related and perhaps form an increasing polyploid series. Isozyme data reveal that the two species whose ranges are restricted to the Piedmont, A. mirabilis (2n = 18) and A. jonesiae (2n = 54), are very closely allied and are more distantly related to the previous group. The endemic and midwestern A. furcatus (2n = 18) is isozymically most unlike the other species in the section. Isozyme data do not rule out the possibility that the hexaploids, A. schreberi and A. jonesiae, originated by retrogressive polyploidy rather than by progressive (increasing) polyploidy. The hypothesis that A. chlorolepis arose from A. divaricatus by autopolyploidy is supported by the electrophoretic data. The relationships of the diploids to one another and the mode of origin of A. macrophyllus are not clarified by the isozyme analyses.
ISSN:0035-4902
1938-3401