S. Downie

Publications128
h-index41
Citations5,191
Highly Influential Citations278
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A phylogeny of the flowering plant family Apiaceae based on chloroplast DNA rpl16 and rpoC1 intron sequences: towards a suprageneric classification of subfamily Apioideae.
TLDR
Comparative sequencing of the intron in chloroplast ribosomal protein gene rpl16 was carried out in order to examine evolutionary relationships among 119 species (99 genera) of subfamily Apioideae and 28 species from Apiaceae subfamilies Saniculoidesae and Hydrocotyloideae, and putatively allied families Araliaceae and Pittosporaceae. Expand
Major clades within Apiaceae subfamily Apioideae as inferred by phylogenetic analysis of nrDNA ITS sequences
TLDR
An ITS-based classification of the Apiaceae subfamily Apioideae is proposed that enables direct and precise references to specific groups and facilitates sampling and hypothesis testing in future systematic studies. Expand
Genome of the long-living sacred lotus (Nelumbo nucifera Gaertn.)
TLDR
The slow nucleotide substitution rate makes the sacred lotus a better resource than the current standard, grape, for reconstructing the pan-eudicot genome, and should therefore accelerate comparative analysis between eudicots and monocots. Expand
Phylogenetic Relationships and Chromosome Number Evolution in Passiflora
TLDR
The results of phylogenetic analyses of the trnL/trnT sequence data support the reduction of Killip's 22 subgenera to four as proposed in a new classification system by Feuillet and MacDougal (2004), and character optimization of chromosome numbers on the phylogenetic tree supports x=12 as the base chromosome number for Passiflora. Expand
Molecular systematics of Apiaceae subfamily Apioideae: phylogenetic analyses of nuclear ribosomal DNA internal transcribed spacer and plastid RPO C1 intron sequences.
TLDR
Four major clades in Apiaceae are provisionally recognized and provide the framework for future lower level phylogenetic analyses and a putative secondary structure model of the Daucus carota (carrot) rpoC1 group II intron is presented. Expand
TRIBES AND CLADES WITHIN APIACEAE SUBFAMILY APIOIDEAE : THE CONTRIBUTION OF MOLECULAR DATA
TLDR
This paper summarizes the results of previously published molecular cladistic analyses and presents a provisional classification of the subfamily Apioideae Drude based on taxonomic congruence among the data sets and the inferred relationship among the tribes and informally recognized major clades within Apioidae is presented. Expand
Intercontinental disjunctions in Cryptotaenia (Apiaceae, Oenantheae) : an appraisal using molecular data
TLDR
The monophyly of the genus Cryptotaenia was examined and the phylogenetic placements of its constituent members in order to explain their distribution patterns, including a holarctic distribution pattern that originated in eastern Asia and from there dispersed to Europe and North America. Expand
Use of Chloroplast DNA Rearrangements in Reconstructing Plant Phylogeny
TLDR
Chloroplast DNA (cpDNA) variation has proven to be immensely valuable in reconstructing phytogenies at the species level, and the application of cpDNA comparisons at higher taxonomic levels is now being pursued actively. Expand
a molecular phylogeny of apiaceae subfamily Apioideae: evidence from nuclear ribosomal DNA internal transcribed spacer sequences
TLDR
IT sequences are useful for phylogenetic inference among closely related members of Apioideae but, owing to high rates of nucleotide substitution, are less useful in resolving relationships among the more ancestral nodes of the phylogeny. Expand
Restriction site mapping of the chloroplast DNA inverted repeat : A molecular phylogeny of the Asteridae
By focusing exclusively on the highly conserved inverted repeat region of the chloroplast genome, we extend comparative restriction site mapping to greater evolutionary depths than those to which it… Expand
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