+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Karyological analysis and genome size in Milium (Gramineae) with special reference to polyploidy and chromosomal evolution

Karyological analysis and genome size in Milium (Gramineae) with special reference to polyploidy and chromosomal evolution

Genome 34(6): 868-878

Karyotypes, nuclear DNA amounts, and meiotic behaviour are presented for Milium effusum L. (2n = 28), Milium montianum Parl. (2n = 22), and two cytotypes of Milium vernale Bieb. (2n = 8, 10). The bimodal karyotype of M. montianum (8 large and 14 small chromosomes) is described for the first time. Evidence from C-banding and geographical distribution suggests an ancient interracial allopolyploid origin for M. effusum (2n = 28). Although M. montianum is undoubtedly allopolyploid, its parentage is unconfirmed. A strong resemblance between the M. vernale (2n = 8) karyotype and the eight large chromosomes in M. montianum suggests a common ancestry. It is possible that a diploid form of M. effusum contributed the remaining 14 chromosomes. A selective loss of DNA sequences from the smaller chromosomes during the subsequent reorganization of the allopolyploid genome may have enhanced the bimodality of the karyotype. Geographical distribution and a change in the breeding system support the direction of the change X = 5 to X = 4 in M. vernale. Allopolyploidy appears to have played a central role in the chromosome evolution and speciation of Milium.

(PDF emailed within 0-6 h: $19.90)

Accession: 002147348

Download citation: RISBibTeXText

DOI: 10.1139/g91-134

Related references

Nomenclatura plantarum americanarum. I. Gramineae Milium arundinaceum scandens et mauilosum, Milium latifolium sulcatum, Gramen lappulatum, description by Plumier of species from the Antilles. Phytologia 53(4): 245-249, 1983

Taxonomy and the evolution of genera, with special reference to the family Gramineae. Evolution [New York] 10(3): 235-245, 1956

Genome size evolution and polyploidy in the Daphnia pulex complex Cladocera Daphniidae. Biological Journal of the Linnean Society 97.1, 2009

Cell size does not always correspond to genome size: phylogenetic analysis in geckos questions optimal DNA theories of genome size evolution. Zoology 111(5): 377-384, 2008

Chromosomal variation and evolution Polyploidy and chromosome size and number shed light on evolutionary processes in higher plants. 1966

Phylogenetic analysis of G-banded karyotypes among the South American subterranean rodents of the genus Ctenomys , with special reference to chromosomal evolution and speciation. Biological Journal of the Linnean Society 54(1): 43-70, 1995

Studies on the biology of the Gramineae with special reference to vegetative propagation in the species Poa annua L. and in some other Gramineae. Anu. Lucr. sti., Cluj. 13: 225-39, 1957

Polyploidy versus diploidy: a new model for the karyological evolution of Cyprinidae. Arquivos do Museu Bocage: 375-383, 1989

Genome evolution and polyploidy in Leucanthemum vulgare Lam. Aggr. (Compositae). Karyotype analysis and DNA microdensitometry. Caryologia 36(1): 1-18, 1983

Genome size and chromosomal evolution in leaf beetles (Coleoptera, Chrysomelidae). Hereditas (Lund). September; 1191: 1-6, 1993

Genome Size, Karyotype Polymorphism and Chromosomal Evolution in Trypanosoma cruzi. PLoS ONE 6(8): e23042, 2011

Genome size, karyotype polymorphism and chromosomal evolution in Trypanosoma cruzi. Plos One 6(8): E23042-E23042, 2012

Cell size with special reference to multiplication of HeLa strain in vitro. II. Measurement of mitotic and intermitotic duration with special reference to size of nucleus. Nagoya Journal of Medical Science 24: 190-196, 1962

Chromosomal evolution in genus carex as viewed from nuclear dna content with special reference to its aneuploidy. Japanese Journal of Genetics 59(5): 465-472, 1984

Chromosomal evolution of the suborder Cyprinoidei, with special reference to topical problems of phylogenetic relationships of their families. Cytobios 87(350): 169-179, 1996