Chromosome polymorphism of Atlantic salmon (Salmo salar) from the River Dzwina, Baltic Sea Basin: arm length and NOR location variation of the eighth chromosome

1994 ◽  
Vol 72 (2) ◽  
pp. 364-367 ◽  
Author(s):  
Pawel Woznicki ◽  
Malgorzata Jankun
Keyword(s):  
Atlantic Salmon ◽  
Chromosome Pair ◽  
Constitutive Heterochromatin ◽  
Nucleolus Organizer ◽  
Paracentric Inversion ◽  
Chromosome Polymorphism ◽  
Nucleolus Organizer Regions ◽  
Metacentric Pair ◽  
Chromosome Arm ◽  
Baltic Sea Basin

A population of Atlantic salmon from the River Dzwina was karyotyped using conventional staining and banding techniques. The chromosome number was 2n = 58, and the chromosome arm number (NF) was 74. Variation in the size of the long arm of the eighth chromosome pair was observed. The presence of constitutive heterochromatin on this arm was confirmed by C-banding. Silver banding revealed variability in the location of nucleolus organizer regions (NORs) on this arm. Four cytotypes and three phenotypes of the NOR-bearing chromosome were found. The polymorphism of the eighth metacentric pair of chromosomes observed in Atlantic salmon was probably due to deletion and paracentric inversion of the arm involved.

scholarly journals Karyotype, C-band and NOR phenotype of Anatolian endemic fish Squalius anatolicus (Bogutskaya, 1997) (Teleostei, Leuciscidae)

2021 ◽  
Vol 38 (3) ◽  
pp. 311-315
Author(s):  
Sevgi Ünal Karakuş ◽  
Muhammet Gaffaroğlu
Keyword(s):  
Chromosome Pair ◽  
Constitutive Heterochromatin ◽  
Nucleolus Organizer ◽  
Submetacentric Chromosome ◽  
Nucleolus Organizer Regions ◽  
C Banding ◽  
Nor Phenotype ◽  
Acrocentric Chromosomes ◽  
Endemic Fish ◽  
Lake Beysehir

The karyotype and distribution of constitutive heterochromatin and nucleolus organizer regions (NORs) of Anatolian leuciscine endemic to Lake Beysehir, Squalius anatolicus (Bogutskaya, 1997) were analyzed respectively using conventional Giemsa-staining, C-banding and Ag-impregnation. Diploid chromosome number was 2n = 50 and karyotype consisted of 7 pairs of metacentric, 13 pairs of submetacentric, 5 pairs of subtelo- to acrocentric chromosomes, NF value equaled 90. Heteromorphic elements indicating sex chromosomes were not detected. C-banding revealed clear pericentromeric constitutive heterochromatin blocks in several chromosomes. Ag-impregnation revealed the size heteromorphism of NORs that covered almost the entire short arms of the middle-sized submetacentric chromosome pair. The karyotype pattern and simple NOR phenotype of S. anatolicus are nearly identical with that found not only in Squalius species analyzed to date but also in many other representatives of the Eurasian leuciscine cyprinids, which indicates remarkable chromosome stasis in this leuciscid lineage.

scholarly journals A study of constitutive heterochromatin and NOR banding in three species of Indian major carps from the State of Haryana, India

2018 ◽  
Vol 10 (2) ◽  
pp. 535-539 ◽  
Author(s):  
Neeru Neeru ◽  
Anita Bhatnagar ◽  
Abhay Singh Yadav
Keyword(s):  
Chromosome Pair ◽  
Constitutive Heterochromatin ◽  
Organizer Region ◽  
Nucleolus Organizer Region ◽  
Chromosomal Evolution ◽  
Nucleolus Organizer ◽  
Catla Catla ◽  
Indian Major Carps ◽  
Cytogenetic Survey ◽  
Pair Number

Cytogenetic survey of fishes becomes increasingly important to establish chromosomal relation between the teleosts, to have a glimpse of the relation between chromosomal evolution and differentiation of vertebrate species. In the present study, Chromosome banding studies was done in three species of carps i.e. Catla catla (Hamilton, 1822), Labeo rohita (Hamilton, 1822) and Cirrhinus mrigala (Hamilton, 1822). Diploid chromosome number 50 was observed in all 3 species of carps. The chromosomes of C. catla, L. rohita and C. mrigala showed constitutive heterochromatin at telomeric and centromeric regions of chromosomes. The Ag-NOR (Argyrophilic-Nucleolus Organizer Region) bands were observed on homologous chromosome pair number 11 in C. catla, 15th chromosome pair in L. rohita. In C. mrigala, the Ag- NOR staining elucidated the presence of darkly stained NORs on the terminal region of the long arms of one of the chromosome. Another homologue of this chromosome pair could not be localized due to scattering of chromosomes. The results depict that variation in ecological conditions with time due to human activities can not only affect the chromosomal number but also chromosomal morphology.  

scholarly journals Karyotypic characterization of Prochilodus mariae, Semaprochilodus kneri and S. laticeps(Teleostei: Prochilodontidae) from Caicara del Orinoco, Venezuela

2003 ◽  
Vol 1 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Claudio Oliveira ◽  
Mauro Nirchio ◽  
Ángel Granado ◽  
Sara Levy
Keyword(s):  
Chromosome Number ◽  
Chromosome Pair ◽  
Nucleolus Organizer ◽  
Single Chromosome ◽  
Nucleolus Organizer Regions ◽  
The Family ◽  
Structural Chromosome ◽  
Almost All ◽  
Freshwater Environments

Fish of the family Prochilodontidae are considered one of the most important components of commercial and subsistence fishery in freshwater environments in South America. This family consists of 21 species and three genera. In the present study, the karyotypes of Prochilodus mariae, Semaprochilodus kneri, and S. laticeps from Caicara del Orinoco, Bolivar State, Venezuela were studied. The species P. mariae, S. kneri and S. laticeps exhibited 2n=54 chromosomes (40 metacentric and 14 submetacentric), a single chromosome pair with nucleolus organizer regions, and a large amount of heterochromatin found at centromeric and pericentromeric positions in almost all chromosomes. The P. mariae specimens studied displayed 0 to 3 supernumerary microchromosomes. The data obtained here confirm the conservative nature of the chromosome number and morphology of Prochilodontidae and reinforce the hypothesis that small structural chromosome rearrangements were the main cause of the karyotypic diversification seen in this group.

Constitutive Heterochromatin and Nucleolus Organizer Regions in Rana graeca (Anura, Amphibia) from the North Balkans (Yugoslavia)

Copeia ◽  
1996 ◽  
Vol 1996 (1) ◽  
pp. 223 ◽  
Author(s):  
Olivera Spasic ◽  
Nikola Tanic ◽  
Jelena Blagojevic ◽  
Mladen Vujosevic
Keyword(s):  
Constitutive Heterochromatin ◽  
Nucleolus Organizer ◽  
Nucleolus Organizer Regions ◽  
The North
Sign in / Sign up

Export Citation Format

Share Document