+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Trends in site-number change of rDNA loci during polyploid evolution in Sanguisorba (Rosaceae)

Trends in site-number change of rDNA loci during polyploid evolution in Sanguisorba (Rosaceae)

Chromosoma (Berlin) 110(8): 550-558

To elucidate the evolutionary dynamics of rDNA site number in polyploid plants, we determined 5S and 18S-5.8S-26S rDNA sites for ten species of Sanguisorba (2n=14, 28, 56) and a single species of each of three outgroup genera, Agrimonia (2n=28), Rosa (2n=14), and Rubus (2n=14) by the fluorescence in situ hybridization (FISH) method. We also estimated phylogenetic relationships among these species using matK chloroplast DNA (cpDNA) sequences, and reconstructed the evolutionary history of rDNA site number based on the maximum parsimony method. The 2n=14 and 2n=28 plants of all genera except Rosa carried two 5S rDNA sites, whereas Rosa and 2n=56 plants carried four sites. The 2n=14 plants had two 18S-5.8S-26S rDNA sites, whereas Sanguisorba annua and 2n=28 plants had four or six sites. Phylogenetic analysis showed that polyploidization from 2n=14 to 2n=28 has occurred once or three times in Sanguisorba and Agrimonia. The 5S rDNA sites duplicated during each ancestral polyploidization were evidently lost after each polyploidization. However, the duplicated 18S-5.8S-26S rDNA sites were all conserved after each polyploidization. Thus, the duplicated 5S rDNA sites tend to have been eliminated, whereas those of 18S-5.8S-26S rDNA tend to have been conserved in Sanguisorba. In the most parsimonious hypothesis, 2n=14 in S. annua is a secondary, putatively dysploid state, reduced from 2n=28.

(PDF emailed within 0-6 h: $19.90)

Accession: 011594678

Download citation: RISBibTeXText

PMID: 12068972

DOI: 10.1007/s00412-001-0175-z

Related references

Some aspects of the pollen morphology of the genus sanguisorba d rosaceae d sanguisorba minor d sanguisorba officinalis d types taxonomy. Review of Palaeobotany & Palynology 4(1-4): 305-310, 1967

Physical mapping of 45S rDNA loci by fluorescent in situ hybridization and evolution among polyploid Dendranthema species. Chromosome Science 7(3): 71-76, 2003

Search for procyanidins from the roots of Sanguisorba officinalis and Sanguisorba minor (Rosaceae). Herba Hungarica 22(3): 7-12, 1983

Sanguisorba officinalis L. and Sanguisorba alpina Bunge (Rosaceae) in Iceland. Natturufraedingurinn 68(3-4): 163-173, 1999

Some aspects of floral ecology in Rosaceae. Comparative morphological and histological study in Sanguisorba officinalis L. and Poterium sanguisorba L. Bulletin de la Societe botanique de France Lettres botaniques26(3): 322-324, 1979

Some aspects of floral ecology in the Rosaceae: comparative morphological and histological study of Sanguisorba officinalis and Poterium sanguisorba. Bulletin de la Societe Botanique de France 126(3): 311-324, 1979

Some aspects of the floral ecology in rosaceae morphological and comparative histological study in sanguisorba officinalis and poterium sanguisorba. Bulletin de la Societe Botanique de France 126(3): 311-324, 1979

Evolutionary site-number changes of ribosomal DNA loci during speciation: complex scenarios of ancestral and more recent polyploid events. Aob Plants 7: -, 2015

FISH mapping of 35S and 5S rRNA genes in Artemisia subgenus Dracunculus Asteraceae changes in number of loci during polyploid evolution and their systematic implications. Botanical Journal of the Linnean Society, 2013

Variation in rDNA locus number and position among legume species and detection of 2 linked rDNA loci in the model Medicago truncatula by FISH. Genome 48(3): 556-561, 2005

Evolution of rDNA in Claytonia polyploid complexes. Plant biosystematics edited by William F Grant: 341, 1984

Disproportionate numbers of RDNA loci in diploid and polyploid testis nuclei of Gerris najas detected by fluorescence in situ hybridization. Cell Biology International 18(4): 245-255, 1994

Pubescence in the Sanguisorba group (Rosaceae). Botaniska notiser: 21(4) 641-651, 1968