scholarly journals Karyotype analysis with orcein and CMA in two species of Alocasia (Schott) G. Don (Araceae)

1970 ◽  
Vol 40 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Syeda Sharmeen Sultana ◽  
Hosne Ara ◽  
Sheikh Shamimul Alam
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Karyotype Analysis ◽  
Chromosome Complement ◽  
Taxonomic Status ◽  
The Other ◽  
First Report ◽  
Total Length ◽  
Internet Information ◽  
Chromosomal Length

Alocasia fallax Schott and A. odora (Roxb.) Koch (Araceae) were investigated cytogenetically to confirm their taxonomic status. There is no report of 2n chromosome number for A. fallax in the available literature and internet information. Therefore the 2n chromosome number (2n = 28) found in this study is probably the first report for A. fallax. Alocasia odora showed exactly double 2n chromosome number (2n = 56) from A. fallax. In addition to chromosome number, the other karyotypic features of A. odora were exactly double for that of A. fallax. The centromeric formulae of A. fallax was 24 m + 4 sm whereas it is just double in A. odora. Total length of 2n chromosome complement of A. odora (62.58 μm) was almost double to A. fallax. The range of chromosomal length of the two species was almost same. Moreover, A. odora plant is much taller than A. fallax. All of these data suggests that A. odora might be an autotetraploid of A. fallax which in course of evolution had undergone some changes in GC-rich repeats. Key words: Alocasia; CMA; Karyotype analysis DOI: http://dx.doi.org/10.3329/bjb.v40i1.7998 Bangladesh J. Bot. 40(1): 53-56, 2011 (June)

Aspidistra revoluta, a new species from limestone areas in Chongqing, China

Phytotaxa ◽  
2016 ◽  
Vol 257 (3) ◽  
pp. 280 ◽  
Author(s):  
Hao Zhou ◽  
Si-rong Yi ◽  
Qi Gao ◽  
Jie Huang ◽  
Yu-jing Wei
Keyword(s):  
New Species ◽  
Chromosome Number ◽  
Average Length ◽  
Chromosome Complement ◽  
Pollen Grains ◽  
The Other ◽  
Morphological Comparison ◽  
Chongqing Municipality ◽  
Karyotype Asymmetry ◽  
A New Species

Aspidistra revoluta (Asparagaceae) is described and illustrated as a new species from limestone areas in southern Chongqing Municipality, China. The new species can be distinguished from the other Aspidistra species by its unique umbrella-like pistil with large revolute stigma lobes that bent downwards and touch the base of the perigone. A detailed morphological comparison among A. revoluta, A. nanchuanensis and A. carnosa is provided. The pollen grains of A. revoluta are subspherical and inaperturate, with verrucous exine. The chromosome number is 2n = 38, and the karyotype is formulated as 2n = 22m + 6sm + 10st. The average length of chromosome complement is 4.50 μm, and the karyotype asymmetry indexes A1 and A2 are respectively 0.37±0.03 and 0.49±0.01.

scholarly journals Orcein and DAPI-stained karyotype analysis of Alocasia macrorrhizos (L.) G. Don

2021 ◽  
Vol 45 (1) ◽  
pp. 27-35
Author(s):  
Ashma Ahmed Warasy
Keyword(s):  
Karyotype Analysis ◽  
Chromosome Complement ◽  
Asymmetry Index ◽  
Lower Amount ◽  
Interphase Nuclei ◽  
Karyotype Asymmetry ◽  
Karyotype Analyses ◽  
Dapi Banding ◽  
Gradient Type ◽  
Chromosomal Length

Karyotype analyses are required for the identification, characterization, and genetic improvement of any organism. Alocasia macrorrhizos (L.) G. Don. was investigated cytogenetically to determine the karyotypic features. Complex chromocenter type, of interphase nuclei, and gradient type of prophase chromosomes were found in this study. Alocasia macrorrhizos was found to possesses 2n=28 chromosomes. The total length of the 2n chromosome complement was recorded as 98.83±1.39 μm. The range of chromosomal length was 2.50±0.10-4.70±0.10 μm. A gradual decrease in chromosomal length was observed. The total form (TF%) value was found to be 43.58%, Karyotype symmetry index (Syi %) was 77.00 % and karyotype asymmetry index (AsK %) was 56.66%. The centromeric formula was 18m+4sm+2ac, representing asymmetric karyotype. In DAPI banding, the 1.48% positive banded region indicates the lower amount of AT rich repeats in this material. Therefore, Alocasia macrorrhizos could be authentically characterized through karyotype analysis. J. Bangladesh Acad. Sci. 45(1); 27-35: June 2021

A clarification of Medicago sinskiae

1991 ◽  
Vol 69 (1) ◽  
pp. 100-106 ◽  
Author(s):  
Ernest Small ◽  
Brenda Brookes
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Related Species ◽  
The Other ◽  
Species Status ◽  
Closely Related Species

Little information has been available to justify the species status of the rare Turkmenian Medicago sinskiae Uljan. recognized by Uljanova in 1964. The holotype and plants raised from its seeds were examined, the chromosome number was determined, and a numerical taxonomic comparison was made of M. sinskiae and the other 12 species of Medicago section Spirocarpos subsection Pachyspirae. It was found that M. sinskiae is well separated from the most closely related species of Medicago and deserves recognition at the rank of species. Key words: Medicago sinskiae, Leguminoseae, alfalfa, taxonomy.

scholarly journals Karyotypic Study of seven Types of Impatiens balsamina L.

1970 ◽  
Vol 15 ◽  
pp. 147-152 ◽  
Author(s):  
USN Momtaz ◽  
G Kabir ◽  
MM Ud-deen ◽  
N Yasmin
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Secondary Constriction ◽  
Karyotype Analysis ◽  
Diploid Chromosome Number ◽  
Interphase Chromosome ◽  
Karyotypic Analysis ◽  
Total Frequency ◽  
Impatiens Balsamina ◽  
Karyotypic Study

Nuclear phenotype and chromosome characteristics of eight types of Impatiens balsamina L. were studied. The diploid chromosome number was found to be 2n=14 in all types of Impatiens balsamina. Interphase chromosome volume was found to range from 0.1665μ3 (violet type) to 0.3904 μ3 (red type). The maximum total chromatin length (24.73μm) was observed in pink type and minimum (11.70μm) in violet type. Maximum total frequency percent (50.00%) was found in both foreign types (red and violet) and minimum (48.03%) in violet type. The karyotype analysis revealed that there was no secondary constriction and sub-terminal chromosome in any of the seven types belonging to Impatiens balsamina. So, on the basis of karyotypic analysis the present findings indicated that all the types of Impatiens balsamina were of primitive nature. Key words: Karyotype, Nuclear phenotype, Impatiens balsamina L.   doi: 10.3329/jbs.v15i0.2155    J. bio-sci. 15: 147-152, 2007

Cytotaxonomic observations on North American Festuca (Poaceae)

1992 ◽  
Vol 70 (10) ◽  
pp. 1940-1944 ◽  
Author(s):  
Susan G. Aiken ◽  
George Fedak
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
North American ◽  
West Coast ◽  
Chromosome Count ◽  
B Chromosomes ◽  
The Other ◽  
Festuca Rubra ◽  
Made In

The presence of B chromosomes is reported in Festuca altaica Trin., where a plant with relatively wide and often flat leaves had a chromosome number of 2n = 4x = 28; an adjacent plant, with conspicuously narrow and tightly rolled leaves, had 2n = 4x = 28 + 2B chromosomes. A first chromosome count of 2n = 42 is reported for Festuca rubra L. ssp. densiuscula (Hackel) Piper, along with observations on the nomenclature and morphology of this west coast subspecies. A first chromosome count for a North American plant of Festuca brevissima Jurtzev is 2n = 14. Collections made in northern Yukon were compared with the type borrowed from Leningrad and with the distribution of this species relative to the other North American diploid Festuca, Festuca aggr. auriculata Drob. A collection of Festuca brachyphylla Schultes from northern Yukon had a chromosome number of 2n = 42, and unusual morphology and phenology were interpreted as the result of a snow patch habitat. A second record for Festuca dasyclada Hackel ex. Beal of a chromosome number of 2n = 28 and justifications for keeping this species in Festuca are presented. Key words: Poaceae, North American, Festuca, chromosomes, morphology, nomenclature.

scholarly journals First Report on Karyotypic, Morphometric and Meiotic Analysis of a Predatory Bombardier Beetle Pherosophus catoirai (Coleoptera: Carabidae) from Jammu region of Outer Himalayas, India

2021 ◽  
Vol 18 (4) ◽  
pp. 817-822
Author(s):  
Arshad Ayoub Bhatti ◽  
Nidhi Slathia ◽  
Manvi K
Keyword(s):  
Chromosome Number ◽  
Y Chromosome ◽  
X Chromosome ◽  
Chromosome Complement ◽  
Diploid Chromosome Number ◽  
Meiotic Analysis ◽  
Chromosome Y ◽  
First Report ◽  
Metaphase Stage ◽  
Spermatogonial Metaphase

Chromosomal studies and manual karyotyping are the aged techniques for determining the identity of a species on evolutionary scale; however, these techniques are simple, reliable and inexpensive to authenticate the existence of a particular species. In the present work, the chromosome complement and meiotic processes of a predatory bombardier beetle Pherosophus catoirai were investigated. This species presented 2n=35 as diploid chromosome number and the chromosomal formula was found to be 12m+8sm+12st+X0. Sex mechanism was X0 type with metacentric X chromosome. Y chromosome was absent in this species. Karyotype revealed small chromosomes except X chromosome which is found to be largest in the spermatogonial metaphase stage. Meiotic stages were pachytene, diplotene, diakinesis and metaphase-I. Present study may find importance to analyse evolution of chromosomes in order Coleoptera particularly in family Carabidae.

Karyological studies in some taxa of the genus Artemisia (Asteraceae)

1994 ◽  
Vol 72 (8) ◽  
pp. 1126-1135 ◽  
Author(s):  
Marian Oliva Brañas ◽  
Joan Vallès Xirau
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Karyotype Analysis ◽  
Chromosome Morphology ◽  
Morphology Evolution ◽  
Karyological Study ◽  
Geographic Origins ◽  
Different Populations ◽  
Basic Numbers ◽  
Diploid Populations

A karyological study of six taxa (eight populations) of the genus Artemisia L. from different geographic origins is presented. The work deals with chromosome number and morphometry. We found the two usual basic numbers in the genus: x = 9, the most common one (in two diploid, two hypotetraploid, one tetraploid and one hexaploid populations) and x = 8 (in two diploid populations). Detailed karyotype analysis allows us to group the different populations and to postulate relationships among them. Key words: Asteraceae, Anthemideae, Artemisia, cytotaxonomy, chromosome morphology, evolution.

Studi Cromosomici nella Sindrome di Turner

1965 ◽  
Vol 14 (2) ◽  
pp. 182-199 ◽  
Author(s):  
F. Franceschini ◽  
B. Dallapiccola ◽  
N. Ricci ◽  
B. Ventimiglia
Keyword(s):  
Chromosome Number ◽  
Karyotype Analysis ◽  
Chromosome Complement ◽  
Turner's Syndrome ◽  
Late Replication ◽  
Turner’S Syndrome ◽  
Cytogenetic Studies

SUMMARYCytogenetic studies were performed in six clinically typical cases of Turner's syndrome. In five of them an XO chromosome complement was observed. In the sixth case the chromosome number appeared normal, but karyotype analysis revealed the presence of three large metacentric chromosomes similar to No. 3. A diagnosis of presumptive isochromosome for the long arm of X was suggested by the autoradiographic evidence of late replication and by the presence of larger than normal Barr bodies and drumsticks.

scholarly journals Karyotype analysis in Chaerophyllum cicutaria Vill. with special emphasis on satellited chromosomes

2014 ◽  
Vol 56 (1) ◽  
pp. 61-72
Author(s):  
Włodzimierz Chojnacki ◽  
Jerzy Bohdanowicz
Keyword(s):  
Chromosome Number ◽  
Karyotype Analysis ◽  
Natural Populations ◽  
Chromosome Complement ◽  
Chromosome Morphology ◽  
Single Pair

Karyological studies were carried out on plants of <em>Chaerophyllum cicutaria (Umbelliferae)</em>, which came from both lowland and montane natural populations. The chromosome number in all the examined plants was 2n = 22 and their karyotypes, though similar in general, showed some minute but distinct differences. There was` a single pair of SAT chromosomes in the chromosome complement. They had compound satellites divided into two or three segments. Seven morphological types of SAT chromosomes differing in number and size of satellite segments were distinguished. With respect to SAT chromosome morphology, the species showed both intra- and interpopulational karyological variation.

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