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园艺学报 ›› 2011, Vol. 38 ›› Issue (2): 353-353–360.

• 研究报告 • 上一篇    下一篇

45S rDNA在蒿属5种植物染色体中的分布

李 真,陈素梅,陈发棣*,王海滨,汤访评,刘兆磊,房伟民   

  1. (南京农业大学园艺学院,南京 210095)
  • 收稿日期:2010-06-28 修回日期:2011-01-17 出版日期:2011-02-25 发布日期:2011-02-25
  • 通讯作者: 陈发棣

Distribution of 45S rDNA Sequence on Chromosomes of Five Species in Artemisia

LI Zhen,CHEN Su-mei,CHEN Fa-di*,WANG Hai-bin,TANG Fang-ping,LIU Zhao-lei,and FANG Wei-min   

  1. (College of Horticulture,Nanjing Agricultural University,Nanjing 210095,China)
  • Received:2010-06-28 Revised:2011-01-17 Online:2011-02-25 Published:2011-02-25
  • Contact: CHEN Fa-di

摘要: 以小麦45S rDNA为探针,通过荧光原位杂交(FISH)技术,研究了45S rDNA在蒿属(Artemisia)5个物种染色体中的分布情况。结果发现,在根尖体细胞有丝分裂中期,中亚苦蒿(A. absinthum Linn.)有1对染色体出现杂交信号;大籽蒿(A. sieversiana Ehrhart ex Willd.)和黄花蒿(A. annua Linn.)各有两对染色体上出现信号;欧亚艾蒿(A. abrotanum Linn.)和牡蒿(A. japonica Thumb.)各有4对染色体出现杂交信号。信号位点除了分布在随体上,主要分布在非随体染色体的端部,而在欧亚艾蒿中发现1对信号位点分布在近端部,而且信号间的强弱也不尽相同。基于FISH技术的核型分析,不仅能够提供稳定、可靠的细胞学标记,而且进一步丰富了染色体分析的基础资料。

关键词: 蒿属, 45S rDNA, FISH, 核型

Abstract: Fluorescent in situ hybridization(FISH)was carried out to ascertain the distribution patterns of the 45S rDNA on chromosomes of five species in Artemisia. At mitotic metaphase in root tip cells,one pair of 45S rDNA loci was detected on chromosomes of A. absinthum Linn. Two pairs of signals were detected both in A. sieversiana Ehrhart ex Willd. and A. annua Linn. Four pairs of loci were detected both in A. abrotanum Linn. and A. japonica Thumb. A large part of sites were detected on the terminal regions on non-satellite chromosomes,besides one pair on subterminal regions,and the intensity of hybridization signals varied. Karyotype analysis based on FISH can not only provide stable and remarkable landmarks but also enrich the basic information on chromosomes.

Key words: Artemisia, 45S rDNA, FISH, karyotype

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