Karyotype and Characteristics of Nucleolar Organizer Regions in Longfin Carp, <i>Labiobarbus leptocheilus</i> (Cypriniformes, Cyprinidae)

Abstract

Karyotype and nucleolar organizer regions (NORs) were studied in the longfin carp (Labiobarbus leptocheilus) from Mekong Basin of Thailand. The mitotic chromosomes were directly prepared from kidney cells from five male and five female fishes and stained by conventional staining and Ag-NOR banding. The chromosome number was 2n=50 and the fundamental number (number of the chromosome arms, NF) was 86 in both male and female fishes. The karyotype was composed of six large metacentric, eight large acrocentric, six large telocentric, four medium metacentric, six medium submetacentric, six medium acrocentric, four medium telocentric, four small metacentric, two small acrocentric and four small telocentric chromosomes. The Ag-NOR banding showed a single pair of Ag-NORs adjacent to the telomeric position of the short arm of the chromosome pair 8.

Chromosomes of Asian cyprinid fishes: Variable karyotype patterns and evolutionary trends in the genus Osteochilus (Cyprinidae, Labeoninae, “Osteochilini”)

“…Noteworthy, the karyotype now reported for O. waandersi was different from that reported by Magtoon and Arai (1993 ).Cypriniform chromosomes have notable small sizes ( Sember et al. , 2015 ; Saenjundaeng et al , 2018 ) and this feature can make it difficult to visualize the correct centromere position ( Ráb and Collares-Pereira, 1995 ; Spoz et al , 2014 ; Knytl et al , 2018 ), thus impairing the identification of the chromosomal morphology.…”

“…Our data also demonstrated that Osteochilus species have more bi-armed elements in their karyotypes, suggesting that orthoselection and meiotic drift (White, 1973;Molina et al, 2014) could be strong evolutionary drivers for this group. Noteworthy, the karyotype now reported for O. waandersi was different from that reported by Magtoon and Arai (1993).Cypriniform chromosomes have notable small sizes (Sember et al, 2015;Saenjundaeng et al, 2018) and this feature can make it difficult to visualize the correct centromere position (Ráb and Collares-Pereira, 1995; Spoz et al, 2014; Knytl et al, 2018), thus impairing the identification of the chromosomal morphology.…”

Worldwide Research Trends on Microalgae and Recent Work in Cytologia

“…Alongklod Tanomtong s group from Khon Kaen University, Thailand, is playing an active role. They have investigated the karyotype and chromosome characteristics of nucleolar organizing regions (NORs) in Thai fishes, including the snakeheads Channa marulius and C. marulioides (Perciformes: Channidae) (Sarasan et al 2018), hihgfin barb, Cyclocheilichthys armatus (Cypriniformes, Cyprinidae) from the Chao Phraya River (Chaiyasan et al 2018), and longfin carp, Labiobarbus leptocheilus (Cypriniformes, Cyprinidae) from the Mekong Basin (Saenjundaeng et al 2018). They have also published papers on the tropical oyster Crassostrea iredalei (Ostreoida, Ostreidae) from Nakhon Si Thammarat province (Chooseangjaew et al 2018) and black lancer, Bagrichthys majusculus (Siluriformes, Bagridae) from Nakhon Phranom and Sing Buri provinces (Supiwong et al 2018).…”

History and New Developments on the 90th Anniversary of Cytologia: On the Occasion of the Publication of “Dawn of Modern Wheat Genetics”

“…In Thailand, including Indochina and the northern Malay peninsula, Alongklod Tanomtong and coworkers have recently focused on fish karyotype analysis and have published 15 reports in Cytologia over the last 2 years on the following fish species: Humpback cardinalfish, Fibramia lateralis (Kasiroek et al 2017a); Banggai cardinalfish, Pterapogon kauderni (Kasiroek et al 2017b); triangle butterflyfish, Chaetodon triangulum and yellow butterflyfish, C. andamanensis (Supiwong et al 2017a); Indian vagabond butterflyfish, Chaetodon decussatus and Lined butterflyfish, C. lineolatus (Supiwong et al 2017b); Nile tilapia, Oreochromis niloticus (Sriuttha et al 2017); three-spot damselfish, Dascyllus trimaculatus (Getlekha et al 2017); ocellated dragonet, Synchiropus ocellatus and picturesque dragonet, S. picturatus (Kasiroek et al 2017c); crystal eye catfish, Hemibagrus wyckii (Supiwong et al 2017d); Chevey s sheetfish, Micronema cheveyi (Pinthong et al 2017); F 1 hybrid catfish: Mekong giant catfish, Pangasianodon gigas striped catfish, P. hypophthalmus and spot pangasius, Pangasius larnaudii Pangasianodon hypophthalmus (Sreeputhorn et al 2017); whitecheek monocle bream, Scolopsis vosmeri (Supiwong et al 2017c); snakehead fishes, Channa marulius and C. marulioides (Sarasan et al 2018); Hihgfin barb fish, Cyclocheilichthys armatus (Chaiyasan et al 2018); black lancer, Bagrichthys majusculus (Supiwong et al 2018); and longfin carp, Labiobarbus leptocheilus (Saenjundaeng et al 2018).…”