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AOBPreview published online on October 20, 2005
Annals of Botany, doi:10.1093/aob/mci283
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© The Author 2005. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received June 1, 2005
Revised September 13, 2005
Accepted September 16, 2005

Article

First Nuclear DNA C-values for 18 Eudicot Families

LYNDA HANSON 1*, AMY BOYD 1, MARGARET A. T. JOHNSON 1, and MICHAEL D. BENNETT 1

1 Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3DS, UK

* To whom correspondence should be addressed.
LYNDA HANSON, E-mail: l.hanson{at}kew.org


  Abstract

• Background and Aims A key target set at the second Plant Genome Size Workshop, held at the Royal Botanic Gardens, Kew in 2003, was to produce first DNA C-value data for an additional 1 % of angiosperm species, and, within this, to achieve 75 % familial coverage overall (up from approx. 50 %) by 2009. The present study targeted eudicot families for which representation in 2003 (42·5 %) was much lower than monocot (72·8 %) and basal angiosperm (69·0 %) families.

• Methods Flow cytometry or Feulgen microdensitometry were used to estimate nuclear DNA C-values, and chromosome counts were obtained where possible.

• Key Results First nuclear DNA C-values are reported for 20 angiosperm families, including 18 eudicots. This substantially increases familial representation to 55·2 % for angiosperms and 48·5 % for eudicots.

• Conclusions The importance of targeting specific plant families to improve familial nuclear DNA C-value representation is reconfirmed. International collaboration will be increasingly essential to locate and obtain material of unsampled plant families, if the target set by the second Plant Genome Size Workshop is to be met.

Keywords: Angiosperm families, chromosome counts, DNA amounts, eudicots, genome size, nuclear DNA C-values.
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