David T. Thomas

Works (11)

Updated: July 5th, 2023 15:57

2011 journal article

Resolving and dating the phylogeny of Cornales – Effects of taxon sampling, data partitions, and fossil calibrations

Molecular Phylogenetics and Evolution, 59(1), 123–138.

By: Q. (Jenny) Xiang  n, D. Thomas n & Q. Xiang*

author keywords: Cornales; Divergence time; Effects of data partitions and taxa sampling; Fossil calibration; Hydrostachyaceae; Phylogeny relationships; 26S rDNA; rbcL; matK; ndhF; atpB; trnL-F; trnH-K
MeSH headings : Bayes Theorem; Calibration; Chloroplasts / genetics; Cornaceae / classification; Cornaceae / genetics; Data Interpretation, Statistical; Fossils; Genetic Speciation; Likelihood Functions; Models, Genetic; Molecular Sequence Data; Phylogeny; RNA, Ribosomal / genetics; Sequence Analysis, DNA
TL;DR: Reducing sampling density within families and analyzing partitioned data sets from coding and noncoding cpDNA, 26S rDNA, and combined data sets produced congruent estimation of divergence times, but reducing the number and changing positions of calibration points resulted in very different estimations. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2009 journal article

Genetic analyses of the federally endangered Echinacea laevigata using amplified fragment length polymorphisms (AFLP)—Inferences in population genetic structure and mating system

Conservation Genetics, 10(1), 1–14.

By: M. Peters n, Q. Xiang n , D. Thomas n, J. Stucky n & N. Whiteman *

author keywords: Echinacea laevigata; Genetic structure; Outcrossing rate; AFLP
TL;DR: Results are encouraging for conservation, signifying that populations may persist due to continued genetic exchange sustained by the outcrossing mating system of the species. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2009 journal article

Phylogeny, origin, and biogeographic history of Aesculus L. (Sapindales) - an update from combined analysis of DNA sequences, morphology, and fossils

Taxon, 58(1), 108–126.

By: A. Harris, Q. Xiang  & D. Thomas

Source: NC State University Libraries
Added: August 6, 2018

2008 review

Molecular evolution of PISTILLATA-like genes in the dogwood genus Cornus (Cornaceae)

[Review of ]. MOLECULAR PHYLOGENETICS AND EVOLUTION, 47(1), 175–195.

By: W. Zhang n, Q. Xiang n , D. Thomas n, B. Wiegmann n , M. Frohlich* & D. Soltis *

author keywords: adaptive evolution; Cornus; gene duplication; MADS-box genes; PISTILLATA-like genes; regulatory gene evolution
MeSH headings : Amino Acid Sequence; Cornaceae / classification; Cornaceae / genetics; DNA, Complementary; Evolution, Molecular; Gene Duplication; Genes, Plant; Molecular Sequence Data; Phylogeny; Plant Proteins / genetics; Selection, Genetic; Sequence Homology, Amino Acid
TL;DR: Estimation and comparison of dN/dS ratios revealed relaxed selection in the PI-like gene in Cornus in comparison with the gene in the closely related outgroups Alangium and Davidia, and in other flowering plants. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
15. Life on Land (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2008 journal article

On the Generic Circumscription of Gonolobus (Apocynaceae, Asclepiadoideae): Evidence from Molecules and Morphology

Systematic Botany, 33(2), 403–415.

By: A. Krings n, D. Thomas* & Q. Xiang* 

author keywords: delimitation; dorsal anther appendages; Gonolobinae; winged follicles
TL;DR: Evidence from parsimony and Bayesian analyses of chloroplast and nuclear data presented here supports the monophyly of both the subtribe and the genus Gonolobus in a narrow or broad sense. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2008 journal article

Rates of nucleotide substitution in Cornaceae (Cornales)—Pattern of variation and underlying causal factors

Molecular Phylogenetics and Evolution, 49(1), 327–342.

By: Q. Xiang n , J. Thorne n, T. Seo n, W. Zhang n, D. Thomas n & R. Ricklefs *

author keywords: Comus; Cornaceae; Divergence time; Rate of molecular evolution; Rate of morphological evolution; Speciation
MeSH headings : Bayes Theorem; Chloroplasts / genetics; Cornus / anatomy & histology; Cornus / classification; Cornus / genetics; DNA, Chloroplast / genetics; DNA, Plant / genetics; Evolution, Molecular; Fossils; Genes, Plant; Genetic Speciation; Genome, Chloroplast; Models, Genetic; Nucleotides / genetics; Phylogeny; Sequence Analysis, DNA
TL;DR: This study examined the rate and pattern of molecular evolution for five DNA regions over a phylogeny of Cornus, the single genus of Cornaceae, and suggested a possible localized link between species richness and rate of nonsynonymous nucleotide substitution for the combined cpDNA regions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2008 article

Tracking character evolution and biogeographic history through time in Cornaceae - Does choice of methods matter?

Xiang, Q.-Y., & Thomas, D. T. (2008, May). JOURNAL OF SYSTEMATICS AND EVOLUTION, Vol. 46, pp. 349–374.

By: Q. Xiang  & D. Thomas

author keywords: AReA; BAYESTRAITS; BEAST; biogeography; chromosome evolution; Cornaceae; fruit and inflorescence evolution; LAGRANGE; MESQUITE; divergence time
UN Sustainable Development Goal Categories
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2006 journal article

Ancestral chloroplast polymorphism and historical secondary contact in a broad hybrid zone of Aesculus (Sapindaceae)

AMERICAN JOURNAL OF BOTANY, 93(3), 377–388.

By: J. Modliszewski n, D. Thomas n, C. Fan *, D. Crawford *, C. DePamphilis * & Q. Xiang n 

author keywords: Aesculus; cpDNA inheritance; hybrid zone; phylogeography; Pleistocene; Sapindaceae; secondary contact; southeastern United States
TL;DR: The cpDNA data suggest that the hybrid zone originated through historical local gene flow, yet is maintained by periodic long-distance pollen dispersal, which supports the historical presence of A. pavia in the Piedmont, although they are at present locally extinct. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2006 journal article

Species Level Phylogeny of the Genus Cornus (Cornaceae) Based on Molecular and Morphological Evidence-Implications for Taxonomy and Tertiary Intercontinental Migration

Taxon, 55(1), 9.

By: Q. Xiang n , D. Thomas n, W. Zhang n, S. Manchester * & Z. Murrell*

author keywords: biogeography; Cornus; Cornaceae; ITS; matK; morphology; phylogeny
TL;DR: The phylogeny based on the total evidence tree including fossils supports an origin and early Tertiary diversification of Cornus in Europe and multiple trans-Atlantic migrations between Europe and North America by the early TERTiary. (via Semantic Scholar)
UN Sustainable Development Goal Categories
14. Life Below Water (OpenAlex)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2005 journal article

Phylogeny, biogeography, and molecular dating of cornelian cherries (Cornus, Cornaceae) – tracking Tertiary plant migration

Evolution, 59(8), 139–155.

By: Q. Xiang n , M. Sr, D. Thomas n, W. Zhang n & C. Fan *

UN Sustainable Development Goal Categories
14. Life Below Water (OpenAlex)
Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2004 journal article

Heterogeneous evolution of the Myc-like Anthocyanin regulatory gene and its phylogenetic utility in Cornus L. (Cornaceae)

MOLECULAR PHYLOGENETICS AND EVOLUTION, 33(3), 580–594.

By: C. Fan n, M. Purugganan n, D. Thomas n, B. Wiegmann n  & Q. Xiang n 

author keywords: Cornus; heterogeneous evolution; myc-like anthocyanin regulatory gene; phylogenetics; positive selection
MeSH headings : Anthocyanins / genetics; Cloning, Molecular; Cornus / genetics; DNA Primers / genetics; Databases as Topic; Evolution, Molecular; Gene Deletion; Genes, Plant; Genes, myc; Models, Genetic; Mutation; Phylogeny; Polymerase Chain Reaction
TL;DR: Phylogenetic analyses demonstrate that the myc-like anthocyanin regulatory gene has potential as an informative phylogenetic marker at different taxonomic levels, depending on the data set considered (DNA or protein sequences) and regions applied (exons or introns). (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

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