The Molecular Systematics of Rhododendron (Ericaceae): A Phylogeny Based Upon RPB2 Gene Sequences

  title={The Molecular Systematics of Rhododendron (Ericaceae): A Phylogeny Based Upon RPB2 Gene Sequences},
  author={Loretta Goetsch and Andrew J. Eckert and Benjamin D. Hall},
Abstract Classification of Rhododendron species based on morphology has led to a consensus taxonomy recognizing the major subgenera Azaleastrum, Hymenanthes, Pentanthera, Rhododendron, Tsutsusi, and three minor ones. To determine whether these subgenera are monophyletic and to infer phylogenetic relationships between Rhododendron sections and species, we carried out a cladistic analysis using molecular data, including all groups within the genus. For this purpose, we sequenced a large part of… 

Incongruent phylogenies and its implications for the study of diversification, taxonomy and genome size evolution of Rhododendron (Ericaceae)

This study provides evidence for such a shift to small genome-tropical species within a genus and sees the merit in the recognition of the five major clades at the sub generic level but given the amount of incongruence a large amount of species cannot be confidently assigned to one of these five clades.

Phylogeny of Rhododendron subgenus Hymenanthes based on chloroplast DNA markers: between-lineage hybridisation during adaptive radiation?

The distribution of R. praevernum, R. calophytum, and R. insigne within the Chinese/Himalayan range of Rhododendron indicates an ancestor that came from the north or east to meet the diversifying group of Hymenanthes in the Himalayas, making the SE Asian members of Hymananthes a polyphyletic group.

Numerical classification of Rhododendron (Ericaceae) based on seed morphology and protein profile

Seeds of 28 taxa and infra-specific taxa of Rhododendron were examined by light and electron microscopy and their protein patterns were determined by SDS-PAGE analysis. A combined data matrix was

Arnica (Asteraceae) phylogeny revisited using RPB2: complex patterns and multiple d-paralogues.

Phylogenetics and genomic patterns of speciation in Pinus with an empahsis on subgenus Strobus

It is demonstrated that Pinus chiapensis is a distinct species, but that taxonomy is not universally accepted, and the absence of allelic coalescence is a severe constraint in the application of phylogenetic methods in Pinus.

Molecular phylogenetic analysis of the north-temperate Labrador Teas (Ericaceae: Rhododendron Subsect. Ledum) suggests a complex genetic history

Analysis of evolutionary history and preliminary consideration of some species boundaries in the Labrador teas using DNA sequence data from five molecular markers to generate a preliminary phylogeny of R. Ledum suggests that taxa combined in recent treatments should be recognized as distinct instead of included within more broadly defined species.

Phylogeny and taxonomy of Erysiphe spp. on Rhododendron, with a special emphasis on North American species

The objectives of this study were to identify the powdery mildew pathogens infecting evergreen Rhododendron spp.

Phylogeographic analysis suggests two origins for the riparian azalea Rhododendron indicum (L.) Sweet

The morphological similarity between the two heterogeneous lineages may be a result of parallel evolution from R. kaempferi or of introgressive hybridization between the species due to strong selective pressure imposed by flooding.

Rhododendron colemanii: A New Species of Deciduous Azalea (Rhododendron section Pentanthera; Ericaceae) from the Coastal Plain of Alabama and Georgia

R. colemanii was characterized based on morphology, flowering phenology, habitat, native range, position in a molecular phylogeny, and genome size and showed to be a coherent species in a clade of section Pentanthera G. Don along with R. luteum Sweet and the Southeastern U.S. azaleas.

Genetic population structure of the alpine species Rhododendron pseudochrysanthum sensu lato (Ericaceae) inferred from chloroplast and nuclear DNA

Both incomplete lineage sorting and interspecific hybridization/introgression may have contributed to the lack of monophyly among R. hyperythrum, R. formosana and R. pseudochrysanthum s.l.



Infrageneric and Sectional Relationships in the Genus Rhododendron(Ericaceae) Inferred from ITS Sequence Data

The internal transcribed spacer regions of nuclear ribosomal DNA of 15 Rhododendron species, representing most sections of the genus, one Ledum species and Cassiope fastigiata were sequenced to explore the infrageneric and sectional relationships of this important North Temperate genus by employing maximum-parsimony analysis using PAUP software.

Phylogenetic Relationships within the Rhodoreae (Ericaceae) with Specific Comments on the Placement of Ledum

The cladistic relationships of the tribe Rhodoreae (Ericaceae; Rhododendroideae) are investigated, and the monophyly of Copeland's segregate genera is supported, although these groups are placed here at subgeneric rank.

Sectional relationships in the genus Rhododendron (Ericaceae): evidence from matK and trnK intron sequences

Phylogenetic relationships among all eight subgenera and 12 sections in Rhododendron as well as its related genera were inferred from matK and trnK intron sequences to provide insights into paraphyletic and monophyletic relationships.

A revision of Rhododendron section Pentanthera

Phenetic analyses indicate that the eastern Asian taxon, R. molle, is best recognized as one species with two geographical subspecies; Rhododendron prinophyllum is quite distinct from R. cumberlandense, but their similarities are due to the retention of primitive characters and they should be recognized as distinct species.

RPB2 gene phylogeny in flowering plants, with particular emphasis on asterids.

A revision of Rhododendron VI. Subgenus Pentanthera (Sections Sciadorhodion, Rhodora and Viscidula )

A revision of the seven species of Rhododendron sections Sciadorhodion, Viscidula and Rhodora (of subgenus Pentanthera ; Ericaceae) is presented, and a cladistic analysis results in the recognition of four sections.

A revision of Rhododendron . IV Subgenus Tsutsusi

A revision of Rhododendron subgenus Tsutsusi is presented: section Tsutsusi with 66 species is equivalent to series Azalea subser. Obtusum ; and section Brachycalyx with 15 species includes some


  • J. Felsenstein
  • Economics
    Evolution; international journal of organic evolution
  • 1985
The recently‐developed statistical method known as the “bootstrap” can be used to place confidence intervals on phylogenies and shows significant evidence for a group if it is defined by three or more characters.

MrBayes 3: Bayesian phylogenetic inference under mixed models

MrBayes 3 performs Bayesian phylogenetic analysis combining information from different data partitions or subsets evolving under different stochastic evolutionary models to analyze heterogeneous data sets and explore a wide variety of structured models mixing partition-unique and shared parameters.

Role of DNA-dependent RNA polymerases II and III in transcription of the adenovirus genome late in productive infection.

DNA-dependent RNA polymerases I, II, and III were isolated and partially purified from KB (human) cells 18 hr after infection with adenovirus 2.0 to demonstrate the role of an RNA polymerase III activity in the synthesis of viral 5.5S RNA and cellular 5S RNA.