Molecules and Cells

, 27:205 | Cite as

Localization of 5S and 25S rRNA genes on Somatic and meiotic chromosomes in Capsicum species of chili pepper

Article

Abstract

The loci of the 5S and 45S rRNA genes were localized on chromosomes in five species of Capsicum, namely, an-nuum, chacoense, frutescens, baccatum, and chinense by FISH. The 5S rDNA was localized to the distal region of one chromosome in all species observed. The number of 45S rDNA loci varied among species; one in annuum, two in chacoense, frutescens, and chinense, and four in baccatum, with the exceptions that ‘CM334’ of annuum had three loci and ‘tabasco’ of frutescens had one locus. ‘CM334’-derived BAC clones, 384B09 and 365P05, were screened with 5S rDNA as a probe, and BACs 278M03 and 262A23 were screened with 25S rDNA as a probe. Both ends of these BAC clones were sequenced. FISH with these BAC probes on pachytenes from ‘CM334’ plant showed one 5S rDNA locus and three 45S rDNA loci, consistent with the patterns on the somatic chromosomes. The 5S rDNA probe was also applied on extended DNA fibers to reveal that its coverage measured as long as 0.439 Mb in the pepper genome. FISH techniques applied on somatic and meiotic chromosomes and fibers have been established for chili to provide valuable information about the copy number variation of 45S rDNA and the actual physical size of the 5S rDNA in chili.

Keywords

BAC fiber-FISH FISH rDNA pachytene 

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Copyright information

© The Korean Society for Molecular and Cellular Biology and Springer Netherlands 2009

Authors and Affiliations

  1. 1.Plant Genomics and Breeding InstituteSeoul National UniversitySeoulKorea
  2. 2.Department of Plant Science, and Research Institute for Agriculture and Life SciencesSeoul National UniversitySeoulKorea

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