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KARYOTYPES AND B CHROMOSOME OF GREATER LONG-TAILED HAMSTER (CRICETULUS TRITON)

WANG Jinxing,ZHAO Xiaofan,DENG Yi,QI Hongying,LIU Yao,ZHANG Zhihong,Koh Hung Sun,SHAN Xiangnian   

  • Online:2006-06-23 Published:2008-07-07

大仓鼠的核型与B 染色体研究

王金星,赵小凡,邓 怿,齐洪英,刘 瑶,张志宏   

  1. 山东大学生命科学学院 , 济南

Abstract: The karyotypes of greater long-tailed hamster (Cricetulus triton) from Jinan, Mt. Tai, Shandong Province, Mts. Changbai, Jilin Province and Xi’an Shaanxi Province in China were observed by conventional and banding technique. The diploid chromosome number and karyotype are identicalin the samples of Jinan, Mts. Changbai and Xi’an, i.e,. 2n=28, and the karyotype consists of 11 pairs of telocentric and 2 pairs of metacentric chromosomes.X chromosome is subtelocentric and Y metacentric. Diploid number of the samplefrom Mt.Tai is 28-29, one extra unpaired chromosome existed in the observed metaphases by 67. 5%. It is B chromosome which is the smallest telocentric in the complement. A chromosomes of the sample were identical with that of samples from Jinan, Xi’an and Mts. Changbai. The G-banded,C-banded, and silver stained karyotypes have been observed, nodifference was found among samples from tour localities. The origin of B chromosome wasdiscussed in the paper.

Key words: Cricetulus triton: karyotype: Banding patterns of chromos ome: B chromosome CLC number:Q 813.4 Document code:A Article ID:boo- l 050(1999) 03-0197-08

摘要: 采用骨髓细胞染色体制片法, 对分布于山东济南、泰山、东北长白山和陕西西安的大仓鼠的染色体组型、G-带、C-带和银染核型进行了分析研究。济南、西安和长白山的标本的二倍体数目和核型相似, 2n =28, 22t+4m+XY (st,m)。泰山标本的二倍体数目为 2n =28~29, 即在67.5 %的中期相中多出了一条形态最小的端着丝粒染色体, 这条染色体为B染色体, 可能起源于X染色体。泰山标本的A染色体组与上述3地标本相同。4地标本的G-带、C-带和银染核型相似。除B 染色体外, 每个端着丝粒染色体都具有着丝粒异染色质, Ag-NORs 较恒定地出现在Nos12,4,8,9,13染色体上。也就是说大仓鼠的B 染色体为 C-带阴性,不携带核仁组织者。这种B染色体 C-带阴性的特征在赤狐、黑家鼠和大林姬鼠朝鲜亚种中亦有报道。

关键词: 大仓鼠, 核型, 带型, B 染色体