中国农业科学 ›› 2007, Vol. 40 ›› Issue (4): 782-787 .

• 园艺 • 上一篇    下一篇

25S rDNA和5S rDNA在大白菜中期染色体上的FISH定位

轩淑欣,申书兴,赵建军,张成合,陈雪平,郄丽娟   

  1. 河北农业大学园艺学院
  • 收稿日期:2006-02-27 修回日期:1900-01-01 出版日期:2007-04-10 发布日期:2007-04-10
  • 通讯作者: 申书兴

Physical Mapping of the 25S rDNA and 5S rDNA to Chinese Cabbage Metaphase Chromosome

  1. 河北农业大学园艺学院
  • Received:2006-02-27 Revised:1900-01-01 Online:2007-04-10 Published:2007-04-10

摘要: 【目的】确定rDNA在中国大白菜基因组中的位点数目和分布位置,并建立识别大白菜不同染色体的特异标记。【方法】用荧光原位杂交技术对25S rDNA和5S rDNA在大白菜有丝分裂中期染色体进行了定位研究。【结果】在大白菜中期染色体上,分别检出了5对25S rDNA杂交信号和3对5S rDNA杂交信号。对应于大白菜中期染色体形态图,确定5对25S rDNA信号分别分布在大白菜1号染色体长臂(1L)的近末端,2号染色体长臂(2L)的近中部,3号和4号染色体长臂(3L、4L)的近着丝点处和10号染色体的随体上,信号强度为10号>2号>3号和4号>1号;而5S rDNA的3对信号分别位于2号染色体的长臂(2L)和9号、10号染色体的短臂(9S、10S)。【结论】在分子水平上为大白菜部分染色体提供了识别标记。

关键词: 大白菜, 25SrDNA, 5S rDNA, 荧光原位杂交

Abstract: With the help of fluorescene in situ hybridization(FISH), in the paper, we have located and analyzed the sites of the 25S and 5S rDNA on the mitotic metaphase chromosomes of Chinese cabbage(Brassica rapa ssp. Pekinensis). The results indicated that there were five pairs of signs detected for 25S rDNA, each at 1S, 2L, 3L, 4L and 10S(satellites) corresponding with the major characters of karyotype, and the signal intensity of the chromosomes were #10>#2>#3和#4>#1. The signal of 5S rDNA was located on 2L, 9S and 20S. in this study, the connection beween the signal location and the satellites and the heterochromatin was discussed.

Key words: Chinese Cabbage, 25S and 5S rDNA, FISH