Journal ArticleDOI
Nuclear variation withinAvenae
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TLDR
The amount of DNA per nucleus and the dry mass of isolated nuclei does not vary significantly between the six diploid species investigated and in polyploids the nuclear dry mass is less than expected from the values obtained for the diploids.Citations
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Nuclear DNA Amounts in Angiosperms
Michael D. Bennett,J. B. Smith +1 more
TL;DR: This paper lists absolute nuclear DNA amounts for 753 angiosperm species, primarily for reference purposes, and so the species are listed in alphabetical order, as this was felt to be more helpful to cyto- and biochemists whom, it is anticipated, will be among its major users.
Journal ArticleDOI
Genome downsizing in polyploid plants
TL;DR: The results suggest that loss of DNA following polyploid formation, or genome downsizing, may be a widespread phenomenon of considerable biological significance and the nature of the evolutionary forces that may be driving DNA loss are discussed.
Journal ArticleDOI
Variation in nuclear DNA in the genus Secale
TL;DR: Evidence is presented which strongly supports the notion that the major evolutionary change in chromosome structure in Secale has involved the addition of heterochromatin at, or close to, the telomeres, and it is suggested that saltatory amplification events at telomere were initially responsible for each large increase in DNA amount.
Journal ArticleDOI
Nuclear DNA and the evolution of allotetraploid Brassicae
S C Verma,H Rees +1 more
TL;DR: DNA amounts, by microdensitometry, are underestimated in nuclei with high DNA density, and it is suggested that the reduction in nuclear size in tetraploids is associated with greater condensation of chromosome material which, in turn, may reflect an adaptive “switching off” of redundant gene copies in the Tetraploid complement.
Journal ArticleDOI
Nuclear DNA Content in Twelve Species of Alstroemeria L. and Some of their Hybrids
TL;DR: Diploid interspecific hybrids were shown to have a DNA content intermediate to the values of the parents involved and it was possible to distinguish aneuploids from euploids based on fluorescence values.
References
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Journal ArticleDOI
Measurements of deoxyribosenucleic acid (DNA) in higher plants by Feulgen photometry and chemical methods
J. McLeish,N. Sunderland +1 more
TL;DR: The Feulgen data indicated that both changes were due to an alteration in the relative proportions of 2C, 4C and 8C nuclei and not to changes in the amount of DNA per haploid chromatid set.
Journal ArticleDOI
Chromosome size and DNA content of species of anemone L. and related genera (Ranunculaceae)
TL;DR: The magnitude of variations in DNA content, the preservation of the karyotype and the tendency towards a simple numerical progression in DNA values, lead us to prefer an interpretation of the evolution of DNA content in terms of differential polynemy to one postulating changes in size of genetic units in an unchanging number of strands per chromosome.
Journal ArticleDOI
Nuclear variation between diploid angiosperms.
Journal ArticleDOI
Chromosome morphology in the genus avena
T. Rajhathy,J. W. Morrison +1 more
TL;DR: The chromosomes of the Avena species were studied and their karyotypes established, indicating an alloploid origin for the polyploid species.
Journal ArticleDOI
Chromosome weights and measures in the Triticinae.
C. Pegington,H Rees +1 more
TL;DR: Measurements of the dry mass of chromosomes provide further and more precise information about structural changes, such as large scale diminution or, for that matter, accretion of chromosome material that may have taken place during this evolutionary process.