Plant Dna C-Values Database (Release 2.0, January 2003)
MD Bennett1, IJ Leitch1, L Hanson1, B Murray2 and J Greilhuber3
1Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3DS,UK
2School of Biological Sciences, University of Auckland PBag 92019, New Zealand
3Institut fur Botanik der Universitat Wein, Rennweg 14, A-1030 Wein, Austria
Nuclear DNA C-value and genome size are important biodiversity characters with fundamental biological significance and many uses. Since 1976, six reference lists of angiosperm DNA C-values have been published, which together contain C-values for c. 1.4% of all angiosperm species. Such lists have been widely used for comparative studies at levels ranging from the biosphere to genome organisation (over 1,350 citations to date). In 1997 the Angiosperm Genome Size workshop recommended that new targeted work was essential to improve representation of C-value data in both angiosperms and other plant groups. It was further recommended that DNA amount data for all land plant (embryophyte) groups should be brought together into an easily- accessible Plant DNA C-values database. Targeted work towards both of these goals has been ongoing. Firstly, improved familial representation of C-values has been achieved in angiosperms (82 new families reported), gymnosperms (complete familial representation reached) and pteridophytes (familial representation doubled). Secondly, in an international collaboration, C-value data for angiosperms, gymnosperms, pteridophytes and bryophytes were combined to produce the first one-stop user-friendly Plant DNA C-values database in September 2001
(http://www.rbgkew.org.uk/cval/homepage.html). In January 2003, release 2.0 went live, where DNA amounts for 3927 land plant species (comprising 3493 angiosperms, 181 gymnosperms, 82 pteridophytes and 171 bryophytes) can be readily accessed.