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Family Genus Specific epithet Specific authority Infraspecific epithet Infraspecific authority
2C mean1(pg) 2C mean1(mbp) 2C range1 pg Life cycle
Other specifications (cultivar, population, strain, etc.) Original reference Journal Year
Telomere type Telomere type based in genome sequenced hybrid
Number of 5S signals Range of 5S signals Position2 of 5S signals (5S P)
Number of 35S3 signals Range of 35S signals Position2 of 35S signals (35S P) Arrangement
Total number of rDNA signals (5S+35S) (Total) Number of chromosomes with both 5S and 35S signals (SC)
Number of chromosomes with both 5S and 35S in the same arm (SA) Number of chromosomes with co-localized 5S and 35S signals (Coloc.)

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Family   Genus   Specific epithet
Chromosome number from: -   Ploidy level from: -

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1 1C genome size and n chromosome number for bryophytes.
2 Position refers to that of most chromosomes in the species and can be either interstitial (i), (peri-)centromeric (c) and (sub-)terminal or satellite (t).
3 35S=45S=18S-5.8S-26S rDNA

What’s new?

The second release of the plant rDNA database (Release 2.0, June 2013) comes two and a half years after the database was launched (Release 1.0, January 2011). In such a short period of time, the amount of publications and accessions with data available has almost doubled. The total number of research papers consulted exceeds 600!

 

Up to Release 1.0, the database covered information only from papers that included both the 5S and the 18S-5.8S-26S rDNA loci. From Release 2.0 it also includes data from papers on either one or the other rDNA.

We have also reviewed all publications to provide information about presence of secondary constrictions which are the hallmark of transcription activity of residing rRNA genes (i.e. active NORs).

New information on telomere composition

Data on telomere motives has been extracted from the same source publication of rDNA-FISH in the cases where this information was included. Additionally, other general sources on telomere composition have been used. Some assumptions have been made to organize the data. When a given telomere sequence was confirmed for several species in a genus, this has been considered that any other species from the same genus would present the same telomere sequence. We also state that a given species may have “probably” or “possibly” a given telomere type when there is evidence at the family or order level, respectively. Where there is no evidence above the taxonomic level order the status is “unknown”. In few cases (particularly in species of order Asparagales) presence of more than one telomere signal may be due cross-hybridisation between telomere probes.

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