First nuclear DNA C-values for 18 eudicot families.

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.

Life history evolution and genome size in subtribe Oncidiinae (Orchidaceae).

Background And Aims: Within Oncidiinae, there are several groups of species that are effectively annuals, and we wished to see if these species had smaller genome sizes than average for the subtribe.

Methods: Fifty-four genome size estimates (50 of which are new) for species in subtribe Oncidiinae (Orchidaceae) were examined for the first time in a phylogenetic context to evaluate hypotheses concerning genome sizes and life history traits.

Results And Conclusions: Within the limits of still relatively sparse sampling, the species that are effectively annuals do appear to have smaller genome sizes than average.

First nuclear DNA C-values for 28 angiosperm genera.

This paper reports first DNA C-values for 28 angiosperm genera. These include first DNA C-values for 25 families, of which 16 are monocots. Overall familial representation is 47.

Nuclear DNA C-values in 30 species double the familial representation in pteridophytes.

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.

First Nuclear DNA C-values for 25 Angiosperm Families.

DNA amount is a widely used biodiversity character. As known DNA C-values represent the global angiosperm flora poorly, better coverage of taxonomic groups is needed, including at the familial level. A workshop, sponsored by Annals of Botany , was held at the Royal Botanic Gardens, Kew in 1997.