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Nuclear DNA C-values in 30 Species Double the Familial Representation in Pteridophytes

Authors :
Lynda Hanson
Bennett
Obermayer R
Ilia J. Leitch
Source :
Annals of Botany. 90:209-217
Publication Year :
2002
Publisher :
Oxford University Press (OUP), 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

ISSN :
10958290 and 03057364
Volume :
90
Database :
OpenAIRE
Journal :
Annals of Botany
Accession number :
edsair.doi.dedup.....3ef1f7aba4f7d97c4912b58652fb3368