Chromosome morphology of Clematis, subsection Viornae (Ranunculaceae)

1976 ◽  
Vol 54 (10) ◽  
pp. 1135-1139 ◽  
Author(s):  
W. Michael Dennis
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Chromosome Complement ◽  
Chromosome Morphology ◽  
Terminal Region ◽  
Somatic Chromosome Number ◽  
Median Region ◽  
Acrocentric Chromosomes ◽  
Subterminal Region ◽  
Marked Stability

Cytological studies were made on the following taxa: C. addisonii, C. filifera, C. glaucophylla, C. pitcheri, C. reticulata, C. texensis, C. versicolor, and C. viorna. All species were found to have a somatic chromosome number of 16 with a uniform karyotype consisting of five pairs of metacentric chromosomes with centromeres in the median region and three pairs of acrocentric chromosomes, two pairs with centromeres in the terminal region and one pair with centromeres in the subterminal region. These findings agree with reports of chromosome number and karyotype for other species of Clematis and suggest a marked stability of chromosome complement in the genus.

Chromosome Morphology in Kniphofia.

Bothalia ◽  
1960 ◽  
Vol 7 (2) ◽  
pp. 295-297 ◽  
Author(s):  
J. M. J De Wet
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Chromosome Morphology ◽  
Somatic Chromosome Number ◽  
Number Of Species

A number of species and varieties of the genus  Kniphofia (Liliaceae) were studied cytologically. The somatic chromosome number is  2n = 12 in all the species. This is also true in  Notosceptrum natalense Baker.

A karyotypic and anatomical study of an unidentified liliaceous plant

Bothalia ◽  
1983 ◽  
Vol 14 (2) ◽  
pp. 215-217 ◽  
Author(s):  
J. J. Spies ◽  
D. S. Hardy
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Anatomical Study ◽  
Chromosome Morphology ◽  
Hybrid Origin ◽  
Sterile Plant ◽  
Somatic Chromosome Number ◽  
Epidermal Structure ◽  
Close Relationship ◽  
Aloe Arborescens

An unidentified sterile liliaceous plant and three possible relatives were studied karyotypically and anatomically. All these plants have a somatic chromosome number of 2n = 14. The possibility of the sterile plant having arisen as a result of a mutation appears unlikely, when compared with the possibility of hybrid origin. Chromosome morphology rules out  Bulbine latifolia (L.f.) R. S. and Aloe arborescens Mill, as possible parents. The sterile plant and Aloe marlothii Berger have similar karyotypes and. therefore. A. marlothii may be one of the parents. A close relationship between the sterile plant and the genus Aloe is further confirmed by their similar epidermal structure.

THE CHROMOSOMES OF THE MASKINONGE (ESOX MASQUINONGY)

1970 ◽  
Vol 12 (2) ◽  
pp. 224-229 ◽  
Author(s):  
John F. McGregor
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Karyotype Analysis ◽  
Terminal Region ◽  
Kidney Cells ◽  
Somatic Chromosome Number ◽  
Air Drying ◽  
Esox Masquinongy ◽  
Chromosomal Polymorphisms

The air-drying technique and aceto-orcein stain were used on uncultured kidney cells from juvenile maskinonge, Esox masquinongy, to determine the chromosome number and karyotype. A somatic chromosome number of 2n = 50 was found in 88% of 200 well-spread colchicine metaphases. Karyotype analysis showed that all the chromosomes have their centromeres located in the terminal region. Chromosomal polymorphisms reported by others for kidney cells of fish were not observed in this study.

Comparative Karyotype Investigations in the European Crayfish Astacus astacus and A. leptodactylus (Decapoda, Astacidae)

Crustaceana ◽  
2011 ◽  
Vol 84 (12-13) ◽  
pp. 1497-1510 ◽  
Author(s):  
M. Pavlica ◽  
M. Mcžić ◽  
G. Klobučar ◽  
M. Šrut ◽  
I. Maguire ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Chromosome Complement ◽  
Size Difference ◽  
45S Rdna ◽  
Astacus Astacus ◽  
Fluorochrome Staining ◽  
Rdna Sites ◽  
Freshwater Habitats ◽  
Acrocentric Chromosomes

AbstractThis study reports on the chromosome number and karyological characteristics of the endangered species of European crayfish, Astacus astacus and A. leptodactylus (Decapoda, Astacidae), both native to Croatian freshwater habitats. The karyotype of A. astacus and A. leptodactylus consists of 2n = 176 and 2n = 180 chromosomes, respectively. The haploid chromosome complement of A. astacus consists of 52 metacentric, 35 metacentric-submetacentric, and 1 acrocentric chromosomes. Fluorochrome staining with 4,6-diamino-2-phenylindole (DAPI) has revealed that the karyotypes of A. astacus and A. leptodactylus are characterized by large heterochromatic blocks located at centromeric and intercalary positions on the chromosomes. Interstitial heterochromatic blocks were more frequent in A. astacus than in A. leptodactylus. In both species pairing of chromosomes in meiosis was regular with the majority of bivalents in a ring- and a dumbbell-form. Fluorescence in situ hybridization (FISH) has revealed that two 45S rDNA loci were present in the investigated species. In A. astacus one of the two 45S rDNA-bearing chromosome pairs was highly heteromorphic, exhibiting a three-fold size difference between 45S rDNA sites on homologous chromosomes. Such a size difference was significantly less pronounced in A. leptodactylus. The karyotype differences between A. astacus and A. leptodactylus suggest changes in chromosome number as well as position of repetitive DNAs have played a role in the karyotype evolution of the species of Astacus.

Investigations of the inheritance of flower variegation in Mirabilis jalapa L. 3. Somatic chromosome number, 4. Distribution of the pigments and 5. Chromatographic studies

Euphytica ◽  
1975 ◽  
Vol 24 (1) ◽  
pp. 6-12 ◽  
Author(s):  
W. N. M. Van Kester ◽  
C. J. T. Spitters ◽  
L. Vosselman ◽  
J. M. M. Engels ◽  
A. C. Zeven
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Somatic Chromosome Number ◽  
Mirabilis Jalapa

A new species of Trigonella sect. Ellipticae (Leguminosae-Papilionoideae) from Iran, including cytogenetic and anatomical notes

Phytotaxa ◽  
2015 ◽  
Vol 202 (1) ◽  
pp. 26 ◽  
Author(s):  
Massoud Ranjbar ◽  
ZAHRA HAJMORADI
Keyword(s):  
New Species ◽  
Chromosome Number ◽  
Related Species ◽  
Somatic Chromosome ◽  
Base Number ◽  
Somatic Chromosome Number ◽  
Chromosome Counts ◽  
Closely Related Species ◽  
A New Species

A new species, Trigonella bakhtiarica, from the Iranian province Chahar Mahal Va Bakhtiari is described, illustrated and compared to its most closely related species, T. aphanoneura. Trigonella bakhtiarica has a longer corolla and differs in the shape, surface and size of its pods, which are taxonomically informative characters in Trigonella sect. Ellipticae. Chromosome counts and meiosis assays show that both species are diploid, and that their euploid plants possess a somatic chromosome number of 2n = 2x = 16, which is consistent with the predicted base number of x = 8.

Cytological studies of subterranean clover (Trifolium subterraneum L.)

1952 ◽  
Vol 3 (3) ◽  
pp. 300 ◽  
Author(s):  
JJ Yates ◽  
NH Brittan
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
The Other ◽  
Vicia Sativa ◽  
Somatic Chromosome Number ◽  
Separate Species ◽  
Apparent Relationship ◽  
Isolated Species

Somatic chromosome number and morphology in certain strains of subterranean clover and in species of several other fairly closely related genera have been observed. Dwalganup, Yarloop, Mt. Barker, Wenigup, Burnerang, and Red Leaf strains have each 16 fairly small chromosomes, the chromosome complexes being similar to one another and to that obtained by Wexelsen (1928) for the species. Palestine and Israel strains have each 12 large chromosomes, bearing no apparent relationship to those of the other strains but being the same in number and of a similar order of size to those found in Vicia sativa. Chromosome number and morphology may explain the failure to obtain intervarietal crosses involving Palestine, but not the low percentage of successful crosses between other strains. It is suggested that perhaps Palestine and Israel may be more correctly classed as strains of a separate species and that, with regard to their origin, Wexelsen's idea of mutational changes in isolated species offers probably the best explanation.

scholarly journals Karyomorphology of Two Species of the Genus Spilanthes (Heliantheae-Asteraceae)

2020 ◽  
Vol 8 (4) ◽  
pp. 422-426
Author(s):  
Pushpa Karna Mallick
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Relative Length ◽  
Home Garden ◽  
Somatic Chromosome Number ◽  
Great Role ◽  
Mitotic Chromosomes ◽  
Central Nepal ◽  
Spilanthes Acmella ◽  
Karyotype Formula

In present investigation karyotype of mitotic chromosomes were determined, two species of the genus Spilanthes, namely Spilanthes acmella (L.) Murray and Spilanthes calva DC. from plants transplanted in earthen pots collected from different localities from Central Nepal in my home garden. The somatic chromosome number determined in present study were 2n=36 for both species, Spilanthes acmella (L.) Murray and Spilanthes calva DC. The chromosomes total length ranged from 0.6 to 1.6 µm in Spilanthes acmella (L.) Murray and 0.4 to 2.1µm in Spilanthes calva DC. The relative length ranged from 2.3 to 12.1 µm in the species Spilanthes calva and 2.0 to 8.5 µm in the species Spilanthes acmella. The Karyotype formula were M16+m2+sm16+st2 in Spilanthes calva DC. and M22 +sm14 in Spilanthes acmella (L.) Murray cytologically obtained by using 2% aceto-orcein. The karyotype of the two species shows considerable variation exists in morphology of chromosome and structure. The variation in karyomorphology shows evolved nature of this species which play a great role in evolution. Int. J. Appl. Sci. Biotechnol. Vol 8(4): 422-426

scholarly journals A report on new chromosome number of three Dioscorea species

2019 ◽  
Vol 6 (2) ◽  
pp. 147-150
Author(s):  
Chiranjit Paul ◽  
Bimal Debnath
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Chromosome Count ◽  
Somatic Chromosome Number ◽  
Chromosome Counts ◽  
North East India ◽  
North East ◽  
Forest Belts ◽  
Dioscorea Species ◽  
First Time

Chromosomal study conducted in nine species of Dioscorea from different forest belts of Tripura revealed that their somatic chromosome number ranged from 2n=40 to 2n=60. The record of 2n=40 chromosome in the sexual phenotypes of Dioscorea hamiltonii, Dioscorea glabra and Dioscorea pubera are the first time report from Tripura, North East India. Moreover the somatic chromosome counts of 2n=60 in Dioscorea pentaphylla would be attributed as a new cytotype. However at the respective ploidy level no difference in somatic chromosome count was observed between their sexes.

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