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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
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

Welcome to the Plant rDNA database (Release 2.0)!

The Plant rDNA database is an online resource providing information on numbers and positions of ribosomal DNA signals and their structures for 1639 plant species (out of approximately 3000 listed accessions). The data have been obtained from more than 600 publications on plant molecular cytogenetics using mostly fluorescent in situ hybridisation (FISH) of the 5S and the 18S-5.8S-26S ribosomal RNA genes (rDNA). Where available it also includes information on ploidy level, chromosome number, genome size and life cycle.

Number, position and structure of the 5S and 18S-5.8S-26S rDNA clusters in chromosomes can be characteristic of a given species or genus and used for comparative purposes, including studies in crop science, plant breeding, evolutionary biology, systematics, etc.

Judging by the recently increasing number of publications (more than 50% of the publications listed in the database are from the last ten years) the interest in these data is high and there is a need for compilation, as they are often difficult to find, scattered in a variety of journals. With this purpose, the database holds rDNA loci information on angiosperms, gymnosperms, bryophytes and pteridophytes from papers already published or in press up to June 2013. Regular updates are planned.

Database content in Release 2.0. In land plants, 95.5% of data belong to angiosperms, 4.05% to gymnosperms, 0.18% to bryophytes and 0.21% to pteridophytes. Within angiosperms, most of them (64.25%) are core eudicots, only 0.22% are basal eudicots, and 35.53% are monocots.

Learn more...

Go to What’s new to see the improvements and extensions carried out in this second release.

NOTE: This database is not providing any rDNA sequence data, but information about rDNA loci number and position in chromosomes. If you are interested in sequence data, you can consult other databases on this topic listed at LINKS

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