ArticleAnnals of botany2006
Chromosomal localization of 5S and 18S rDNA in five species of subgenus Strobus and their implications for genome evolution of Pinus.
Article in Annals of botany, 2006. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.
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26 citing papers in PubMed, 85 citations in OpenAlex.
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- How dynamic could be the 45S rDNA cistron? An intriguing variability in a grasshopper species revealed by integration of chromosomal and genomic data.Chromosoma · 2019Article
- Remarkable variation of ribosomal DNA organization and copy number in gnetophytes, a distinct lineage of gymnosperms.Annals of botany · 2019Article
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- Cytogenetic relationships among Citrullus species in comparison with some genera of the tribe Benincaseae (Cucurbitaceae) as inferred from rDNA distribution patterns.BMC evolutionary biology · 2016Article
- Genome-dependent chromosome dynamics in three successive generations of the allotetraploid Festuca pratensis × Lolium perenne hybrid.Protoplasma · 2015Article
- Physical location of SSR regions and cytogenetic instabilities in Pinus sylvestris chromosomes revealed by ND-FISH.Journal of genetics · 2014Article
- Dancing together and separate again: gymnosperms exhibit frequent changes of fundamental 5S and 35S rRNA gene (rDNA) organisation.Heredity · 2013Article
- Distribution of 45S rDNA sites in chromosomes of plants: structural and evolutionary implications.BMC evolutionary biology · 2012Article
- Dynamic distribution patterns of ribosomal DNA and chromosomal evolution in Paphiopedilum, a lady's slipper orchid.BMC plant biology · 2011Article
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND AND
aimsStudying the genome structure of pines has been hindered by their large genomes and uniform karyotypes. Consequently our understanding of the genome organization and evolutionary changes in different groups of pines is extremely limited. However, techniques are now available that can surmount these difficulties. The purpose of this study was to exploit some of these techniques to characterize the genome differentiation between the two subgenera of Pinus: Pinus and Strobus.
methodsDouble-probe fluorescence in-situ hybridization (FISH) was used to localize the 5S and 18S rDNA loci on chromosomes of five species from the subgenus Strobus: P. bungeana, P. koraiensis, P. armandii, P. wallichiana and P. strobus. * KEY
resultsThe rDNA FISH pattern varied considerably among the five species, with P. bungeana being the most distinct. By comparing the results obtained with those of previous rDNA FISH studies of members of the subgenus Pinus, several general features of rDNA loci distribution in the genus Pinus can be discerned: (a) species of subgenus Strobus generally have more rDNA loci than species of subgenus Pinus, correlating with their larger genomes in the subgenus Strobus; (b) there is a clear differentiation in 5S and 18S rDNA loci linkage patterns between the two subgenera; (c) variations in the rDNA FISH pattern correlate with phylogenetic relationships among species within the subgenus; (d) P. bungeana has fewer 18S rDNA sites than other pines investigated to date, but they give intense signals, and may reflect the primary distribution of the 18S-25S rDNA loci in the genus.
conclusionsThe stable differentiation in rDNA FISH pattern between the subgenera suggests that chromosomal rearrangements played a role in the splitting of the two subgenera, and transpositional events rather than major structural changes are likely responsible for the variable rDNA distribution patterns among species of the same subgenus with conserved karyotypes.
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