Banded karyotypes of the Northern pike, Esox lucius (Esocidae) in Turkey

Year 2020, Volume: 16 Issue: 4, 511 - 515, 01.12.2020

Atilla Arslan , Zafer Alpaslan

https://doi.org/10.22392/actaquatr.733738

Cited By: 3

Abstract

In this study, cytogenetic properties of E. lucius in Sakarya River were investigated using standard Giemsa staining, C- and Ag-NOR banding techniques. The number of diploid chromosomes (2n) of individuals studied is 50 and karyotype consists of 50 acrocentric chromosomes with decreasing sizes. Secondary constriction was observed on the third autosomal pair in the karyotype. Morphologically distinguishable sex chromosomes were not detected in male and female individuals. Some chromosomes were centromeric C-positive, while some chromosomes were negative. Active NOR is localized in the pericentromeric region of the third autosomal pair and it is related to C-heterochromatin. Our results are similar to those of other studies and this result shows that the cytogenetic properties of the species are quite stable. Moreover, these results may contribute to the cytogenetic and phylogenetic studies of the Esox species in the future.

Keywords

Chromosome, Ag-NOR band, C-band, Northern pike, Turkey

Türkiye’deki Turna Balığı, Esox lucius (Esocidae)’un Bantlı Karyotipleri

Abstract

Bu çalışmada, Sakarya Nehri’ndeki E. lucius’un geleneksel Giemsa boyama, C- ve Ag-NOR bantlama teknikleri kullanılarak sitogenetik özellikleri araştırıldı. Çalışılan bireylerin diploid kromozom sayısı (2n) 50’dir ve karyotip azalan büyülükte 50 akrosentrik kromozomdan oluşmaktadır. Karyotipte, üçüncü otozomal çiftte ikincil boğum gözlemlendi. Erkek ve dişi bireylerde morfolojik olarak ayırt edilebilir cinsiyet kromozomları tespit edilmedi. Bazı kromozomlar sentromerik C-pozitif iken, bazıları negatifti. Aktif NOR’lar üçüncü otozomal çiftin perisentromerik bölgesinde lokalizedir ve C-heterokromatin ile ilişkilidir. Bulgularımız diğer çalışmaların sonuçları ile benzerdir ve bu sonuç, türün sitogenetik özelliklerinin oldukça stabil olduğunu göstermektedir, Ayrıca bu sonuçlar gelecekte Esox türlerinin sitogenetik ve filogenetik çalışmalarına katkı sağlayabilir. 

Keywords

Kromozom, Ag-NOR bant, C-bant, turna balığı, Türkiye

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