0025425 - BÚ 2006 RIV AT eng J - Journal Article
Suda, Jan - Kyncl, Tomáš - Jarolímová, Vlasta
Genome size variation in Macaronesian Angiosperms: Forty Percent of Canarian Endemic Flora Completed.
[Velikost genomu u Makaronézských endemitů.]
Plant Systematics and Evolution. Roč. 252, 3-4 (2005), s. 215-238. ISSN 0378-2697. E-ISSN 1615-6110
R&D Projects: GA ČR(CZ) GA206/00/1445; GA ČR(CZ) GA206/04/0081; GA AV ČR(CZ) KSK6005114
Institutional research plan: CEZ:AV0Z60050516
Keywords : genome size * cytometry * Macaronesia
Subject RIV: EF - Botanics
Impact factor: 1.421, year: 2005

Genome sizes for 127 Macaronesian endemic angiosperms from 69 genera and 32 families were estimated using propidium iodide flow cytometry. Only about 30-fold variation in 1C-values was found, ranging from 0.32 pg in Echium bonnetii to 9.52 pg in Scilla dasyantha. Taxa with very small DNA amounts ( 1C ≤ 1.4 pg) were themostdominant group (71.7%), whereas the frequency of other categories was much lower (18.9% and 9.4% in taxa with small (1.41 - 3.50 pg) and intermediate 1C-values ( 3.51 - 14.00 pg), respectively). Comparisons of average C- and Cx-values between Macaronesian endemics and non-Macaronesian representatives always revealed significantly smaller amounts in the former group at various taxonomic levels ( genus, family, major phylogenetic lineage). Potential relationship between nuclear DNA content and insular burst of speciation is suggested owing to the marked prevalence of very small genomes among angiosperms that underwent rapid adaptive radiation. Merging all the genome size data on Macaronesian angiosperms available shows that this. ora represents the best covered plant assemblage from the phytogeographic point of view.

Potvrzení velmi malých genomů u ostrovních endemických skupin, které prodělaly adaptivní radiaci
Permanent Link: http://hdl.handle.net/11104/0115815