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

抄録

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.