DNA content and chromosome evolution in the shrubby Oxalis

The amount of DNA varies widely in 20 shrubby Oxalis species analyzed, ranging from 1.76 pg in O. alstonii to 33.00 pg in O. dispar. This wide variation in DNA content coincided with a wide variation in chromosome size and shape. Numerical taxonomy methods showed that this variation in chromosome size and shape in shrubby Oxalis is mainly due to extra DNA. It was also possible to arrange the 20 species examined in six different groups on the basis of karyotypic similarities.Key words: Oxalis, DNA content, chromosome evolution, multivariate analysis.

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Cytotaxonomy of the Festuca spp. from Patagonia

Canadian Journal of Botany ◽

10.1139/b92-140 ◽

1992 ◽

Vol 70 (6) ◽

pp. 1134-1140 ◽

Cited By ~ 10

Author(s):

Jorge Dubcovsky ◽

Arturo J. Martínez

Keyword(s):

Multivariate Analysis ◽

Chromosome Number ◽

Key Words ◽

Distance Matrix ◽

Chromosome Size ◽

Size And Shape ◽

Cytological Data ◽

Vegetative Characters ◽

First Time

Chromosome number and karyotypes of Festuca argentina (2n = 28), Festuca magellanica (2n = 42 and 2n = 56), and Festuca purpurascens (2n = 42) are described here for the first time, as well as new data on the karyotype of Festuca contracta (2n = 42). Multivariate analysis based on chromosome size and shape showed significant (p < 0.05) differences among these species but not among the populations of F. magellanica analyzed. The correlation between a distance matrix among all the Patagonian species based on nine karyotype parameters and one based on morphoreproductive characters was significant (r = 0.60, p < 0.01) but it was not significant when compared with vegetative characters (r = 0.25, p > 0.05). The morphoreproductive and cytological data supported the classification of the Patagonian species in four different subgenera reflecting that the Patagonian Festuca spp. had different phylogenetic origins. Key words: Festuca, karyotype, cytotaxonomy.

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DETERMINATION OF SIZE AND SHAPE FEATURES OF HAZELNUTS USING MULTIVARIATE ANALYSIS

Acta Scientiarum Polonorum Hortorum Cultus ◽

10.24326/asphc.2017.5.6 ◽

2017 ◽

Vol 16 (5) ◽

pp. 49-61 ◽

Cited By ~ 6

Author(s):

Tomo Milošević ◽

Nebojša Milošević

Keyword(s):

Multivariate Analysis ◽

Shape Features ◽

Size And Shape

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DNA content in Tradescantia

Canadian Journal of Genetics and Cytology ◽

10.1139/g85-114 ◽

1985 ◽

Vol 27 (6) ◽

pp. 766-775 ◽

Cited By ~ 11

Author(s):

Arturo Martínez ◽

Héctor D. Ginzo

Keyword(s):

North America ◽

Dna Content ◽

Nuclear Dna ◽

Nuclear Dna Content ◽

Life Forms ◽

Chromosome Size ◽

Polyploid Complex ◽

Ploidy Levels ◽

Vegetative Adaptation ◽

The Relationship

There is a wide variation in the nuclear DNA content and chromosome size between the species belonging to the T. crassifolia and T. virginiana alliances (all the species but one are native to Central and North America). Also the DNA content per genome decreases when the ploidy level increases within the same specific polyploid complex with three ploidy levels (2x, 4x, and 6x). In contrast, no variation was found in the DNA content per genome between different ploidy levels in the T. fluminensis alliance (all the species are native to South America) where they range from 6x to 22x. Since all the species described here are perennials with various life forms, it was possible to analyze the relationship between the DNA content and their vegetative adaptation to the environment. The more specialized species (geophytes and hemicryptophytes) have a higher amount of DNA than the chamaephytes adapted to live in relatively more mesic regions. In the species living in Central and North America there is a positive correlation between the increase in DNA content and the latitude of their native regions.Key words: Tradescantia, DNA content, geographical distribution, life forms, polyploidy.

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Chromosome size and DNA content of species of anemone L. and related genera (Ranunculaceae)

Chromosoma ◽

10.1007/bf00331898 ◽

1966 ◽

Vol 20 (1) ◽

pp. 54-74 ◽

Cited By ~ 84

Author(s):

Klaus Rothfels ◽

Elizabeth Sexsmith ◽

Margaret Heimburger ◽

Margarida O. Krause

Keyword(s):

Dna Content ◽

Chromosome Size

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Nucleic acid content and Chromosome morphology in Chrysanthemum

Genetics Research ◽

10.1017/s0016672300002937 ◽

1969 ◽

Vol 13 (3) ◽

pp. 241-250 ◽

Cited By ~ 15

Author(s):

G. J. Dowrick ◽

A. S. El Bayoumi

Keyword(s):

Nucleic Acid ◽

Chromosome Number ◽

Dna Content ◽

Chromosome Numbers ◽

Chromosome Length ◽

Chromosome Morphology ◽

Nucleic Acid Content ◽

Chromosome Size ◽

Dna Contents ◽

The Relationship

1. The DNA contents of twenty-eight different species and forms of Chrysanthemum have been measured by photometry. It is shown that there are large differences in DNA content between some species with identical chromosome numbers.2. The DNA contents of natural polyploids are frequently not those expected when comparison is made with diploid forms of the same species. The DNA contents of induced polyploids are those expected.3. Chromosome length and volume are positively correlated with DNA content.4. The relationship between chromosome number, chromosome size, DNA content and gene number is considered, and it is suggested that the differences in DNA content may result from the presence of differing amounts of genetically inactive DNA in the chromosomes.

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