浙江农业学报 ›› 2026, Vol. 38 ›› Issue (4): 687-695.DOI: 10.3969/j.issn.1004-1524.20250246

• 园艺科学 • 上一篇    下一篇

蓝铃花根尖染色体核型分析及其核糖体DNA与端粒重复序列的荧光原位杂交定位

刘换换1,2(), 苏晓倩2, 杜文凯1, 胡凤荣2,*()   

  1. 1 江苏农林职业技术学院 风景园林学院, 江苏 镇江 212400
    2 南京林业大学 风景园林学院, 江苏 南京 210037
  • 收稿日期:2025-03-27 出版日期:2026-04-25 发布日期:2026-05-08
  • 作者简介:胡凤荣,E-mail: hufengrong2003@sina.com
    刘换换,研究方向为园林植物遗传育种。E-mail: lhh91@jsafc.edu.cn
  • 通讯作者: 胡凤荣
  • 基金资助:
    江苏农林职业技术学院青年扶持项目(2022kj07)

Karyotype analysis and fluorescence in situ hybridization localization of ribosomal DNA and telomeric repeats in root tip chromosomes of Hyacinthoides non-scripta

LIU Huanhuan1,2(), SU Xiaoqian2, DU Wenkai1, HU Fengrong2,*()   

  1. 1 School of Landscape Architecture, Jiangsu Vocational College of Agriculture and Forestry, Zhenjiang 212400, Jiangsu, China
    2 College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China
  • Received:2025-03-27 Published:2026-04-25 Online:2026-05-08
  • Contact: HU Fengrong

摘要:

为从细胞学角度解析不同花色蓝铃花品种间的亲缘关系与进化程度,并为倍性育种提供细胞学依据,以白色和蓝色蓝铃花品种为材料,采用根尖压片法进行核型分析并绘制核型模式图,同时以45S rDNA和5S rDNA为探针进行双色荧光原位杂交(FISH),并对染色体端粒重复序列进行定位。核型分析结果显示:白色蓝铃花为二倍体,染色体数量2n=2x=16,平均臂比为4.07,核型不对称系数为75.18%,核型公式为2n=2x=16=2m+6sm+4st+4t(sat);蓝色蓝铃花为三倍体,染色体数量2n=3x=24,平均臂比为4.27,核型不对称系数为75.20%,核型公式为2n=3x=24=3m+9sm+6st+6t(sat)。2个品种均属3B核型,各具2对在短臂末端带有随体的t(端部着丝粒)染色体。FISH定位结果表明:45S rDNA信号位于染色体次缢痕区域,5S rDNA信号位于m(中部着丝粒)染色体的长臂顶端;端粒重复序列信号分布于所有染色体两端,在染色体长短臂上无特异性分布。白色蓝铃花检测到4个45S rDNA位点和2个5S rDNA位点;蓝色蓝铃花检测到6个45S rDNA位点和3个5S rDNA位点。核型分析与FISH定位结果一致表明,蓝色蓝铃花是由白色蓝铃花染色体组完整加倍形成,该结果为蓝铃花倍性育种提供了细胞学层面的理论依据。

关键词: 蓝铃花, 染色体, 核型分析, 荧光原位杂交

Abstract:

To elucidate the genetic relationship and evolutionary variations among different flower colors of bluebell (Hyacinthoides non-scripta), a cytological analysis was conducted to provide reliable evidence for polyploid breeding strategies. Karyotype analysis and fluorescence in situ hybridization (FISH) using 45S rDNA, 5S rDNA, and telomere repeats as probes were performed on white-flowered and blue-flowered bluebells. Karyotype analysis revealed that the white bluebell was diploid, with a chromosome number of 2n=2x=16, with an average arm ratio of 4.07, a karyotype asymmetry coefficient of 75.18%, and a karyotype formula of 2n=2x=16=2m+6sm+4st+4t(sat). The blue bluebell was triploid, with a chromosome number 2n=3x=24, with an average arm ratio of 4.27, a karyotype asymmetry coefficient of 75.20%, and a karyotype formula of 2n=3x=24=3m+9sm+6st+6t(sat). Both varieties exhibited a 3B karyotype, with satellite DNA located at the ends of the short arms of two pairs of telocentric (t) chromosomes. The 45S rDNA signals were localized on the chromosomal secondary constrictions and 5S rDNA signals were localized on the top of the long arm of the metacentric (m) chromosome by FISH results. Telomeric repeat sequences were uniformly distributed at both ends of each chromosome, without interstitial signals. White bluebells displayed four 45S rDNA and two 5S rDNA signal sites, while blue bluebells exhibited six 45S rDNA and three 5S rDNA signal sites. Karyotype analysis and FISH signal localization indicated that blue bluebells likely originated from whole-genome duplication of the white bluebell, providing a cytological theoretical basis for polyploid breeding in bluebells.

Key words: Hyacinthoides non-scripta, chromosome, karyotype analysis, fluorescence in situ hybridization (FISH)

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