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Nuclear DNA C-values in 30 species double the familial representation in pteridophytes.
- Source :
-
Annals of botany [Ann Bot] 2002 Aug; Vol. 90 (2), pp. 209-17. - Publication Year :
- 2002
-
Abstract
- Nuclear DNA C-values and genome size are important biodiversity characters with fundamental biological significance. Yet C-value data for pteridophytes, a diverse group of vascular plants with approx. 9000 extant species, remain scarce. A recent survey by Bennett and Leitch (2001, Annals of Botany 87: 335-345) found that C-values were reported for only 48 pteridophyte species. To improve phylogenetic representation in this group and to check previously reported estimates, C-values for 30 taxa in 17 families were measured using flow cytometry for all but one species. This technique proved generally applicable, but the ease with which C-value data were generated varied greatly between materials. Comparing the new data with those previously published revealed several large discrepancies. After discounting doubtful data, C-values for 62 pteridophyte species remained acceptable for analysis. The present work has increased the number of such species' C-values by 93 %, and more than doubled the number of families represented (from 10 to 21). Analysis shows that pteridophyte C-values vary approx. 450-fold, from 0-16 pg in Selaginella kraussiana to 72.7 pg in Psilotum nudum var. gasa. Superimposing C-value data onto a robust phylogeny of pteridophytes suggests some possible trends in C-value evolution and highlights areas for future work.
Details
- Language :
- English
- ISSN :
- 0305-7364
- Volume :
- 90
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Annals of botany
- Publication Type :
- Academic Journal
- Accession number :
- 12197518
- Full Text :
- https://doi.org/10.1093/aob/mcf167