Karyological Analysis and Nucleolar Organizer Region of Tropical Oyster, <i>Crassostrea iredalei</i> (Ostreoida, Ostreidae) in Thailand

Abstract

Conventional karyotyping and detection of nucleolar organizer region (NOR) were performed on a tropical oyster, Crassostrea iredalei from Nakhon Si Thammarat province, Thailand. Chromosome preparations were made from gill tissues. Conventional Giemsa s staining and Ag-NOR banding were performed. The results revealed that the chromosome number was 2n= 20 and fundamental number (NF) was 40, the karyotype consisting of 12 large metacentric and eight medium metacentric chromosomes. The NORs were located terminally on the long arms of the chromosome pair 10.

Worldwide Research Trends on Microalgae and Recent Work in Cytologia

“…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).…”

Karyotype and Chromosome Behavior Analyses in Three Regions of the Indomalayan Realm

“…He and his coworkers have published 92 articles, reporting the karyotypes of at least 124 species in Cytologia since his first such work in 2005. At least 32 of these karyotypes were the first to be reported worldwide, including those of Fibramia lateralis (Kasiroek et al 2017a), Pterapogon kauderni (Kasiroek et al 2017b), Chaetodon decussatus, C. lineolatus (Supiwong et al 2017a), C. triangulum, C. andamanensis (Supiwong et al 2017b), Synchiropus ocellatus, S. picturatus (Kasiroek et al 2017c), Axis axis (Khongcharoensuk et al 2017), Plectorhinchus pictus (Jantarat et al 2017a), Micronema cheveyi (Pinthong et al 2017b), Scolopsis vosmeri (Patawang et al 2017d), and Crassostrea iredalei (Chooseangjaew et al 2018). Professor Tanomtong won the second Wada Memorial Award for this achievement.…”