Molecular phylogenetic analyses of nuclear and plastid DNA sequences support dysploid and polyploid chromosome number changes and reticulate evolution in the diversification of Melampodium (Millerieae, Asteraceae).

@article{Blch2009MolecularPA,
  title={Molecular phylogenetic analyses of nuclear and plastid DNA sequences support dysploid and polyploid chromosome number changes and reticulate evolution in the diversification of Melampodium (Millerieae, Asteraceae).},
  author={Cordula Bl{\"o}ch and Hanna Weiss-Schneeweiss and Gerald M. Schneeweiss and Michael H J Barfuss and Carolin Anna Rebernig and Jos{\'e} Luis Villase{\~n}or and Tod F. Stuessy},
  journal={Molecular phylogenetics and evolution},
  year={2009},
  volume={53 1},
  pages={
          220-33
        }
}
Chromosome evolution (including polyploidy, dysploidy, and structural changes) as well as hybridization and introgression are recognized as important aspects in plant speciation. A suitable group for investigating the evolutionary role of chromosome number changes and reticulation is the medium-sized genus Melampodium (Millerieae, Asteraceae), which contains several chromosome base numbers (x=9, 10, 11, 12, 14) and a number of polyploid species, including putative allopolyploids. A molecular… Expand
Chromosome Numbers, Karyotypes, and Evolution in Melampodium (Asteraceae)
TLDR
Detailed chromosomal information on numbers and karyotypes obtained from 394 individuals in 111 populations of 39 Melampodium species are presented and interpreted in the context of a recently developed phylogenetic hypothesis. Expand
Impact of dysploidy and polyploidy on the diversification of high mountain Artemisia (Asteraceae) and allies
TLDR
A remarkable presence of x = 8-based species has been detected in the clade including high mountain species, which highlights the important role of dysploidy in the diversification of high mountain Artemisia. Expand
Antagonistic effects of whole-genome duplications and dysploidy on genome sizes in the pantropical monocot family Marantaceae: Consequences in the light of a new molecular phylogeny
TLDR
How variable chromosomal evolution can be and how it contributes to species richness and speciation in the plant kingdom is shown. Expand
THE PROMISCUOUS AND THE CHASTE: FREQUENT ALLOPOLYPLOID SPECIATION AND ITS GENOMIC CONSEQUENCES IN AMERICAN DAISIES (MELAMPODIUM SECT. MELAMPODIUM; ASTERACEAE)
TLDR
The origin of tetra‐ and hexaploids in a group of American daisies is clarified, allowing characterization of genome dynamics in polyploids compared to their diploid ancestors, and Patterns of rDNA sequence conversion and provenance of the lost loci are highly idiosyncratic and differ even between allopolyploids of identical parentage. Expand
The evolutionary history of the white-rayed species of Melampodium (Asteraceae) involved multiple cycles of hybridization and polyploidization.
TLDR
Polyploids in M. cinereum and M. leucanthum are of recent autopolyploid origin in line with the lack of significant genomic changes, and Hexaploid M. argophyllum appears to be of autopolyPLoid origin against the previous hypothesis of an allopolyploids origin involving the other two species. Expand
Molecular phylogenetic analyses identify Alpine differentiation and dysploid chromosome number changes as major forces for the evolution of the European endemic Phyteuma (Campanulaceae).
TLDR
Major forces for diversification and evolution of Phyteuma are descending dysploidy as well as allopatric and ecological differentiation within the Alps, the genus' center of species diversity. Expand
Chromosome numbers and polyploidy events in Korean non-commelinids monocots: A contribution to plant systematics
TLDR
Investigating chromosome numbers, base chromosome numbers (x), ploidy levels, rDNA loci numbers, and genome size data to gain insight into the incidence, evolution and significance of polyploidy in Korean monocots finds that diploids and tetraploids prevail. Expand
Molecular and cytogenetic evidence for an allotetraploid origin of Chenopodium quinoa and C. berlandieri (Amaranthaceae).
TLDR
The phylogenetic analyses confirmed allotetraploid origin of both tetraploids involving diploids of two different genomic groups and suggested that these two might share very similar parentage. Expand
Dating the Species Network: Allopolyploidy and Repetitive DNA Evolution in American Daisies (Melampodium sect. Melampodium, Asteraceae)
TLDR
The dating approach is applied in a group of closely related allopolyploids and their progenitor species in the plant genus Melampodium, dated to the Pleistocene, which likely played a role in the near‐absence of major changes in the repetitive fraction of the polyploids' genomes. Expand
Patterns of chromosomal evolution in the florally diverse Andean clade Iochrominae (Solanaceae)
TLDR
This study suggests that the diversification of Iochrominae has not been accompanied by the formation of strong chromosomal barriers, which may help to explain the crossability of many species and even genera within the group. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 89 REFERENCES
Chromosomal stasis in diploids contrasts with genome restructuring in auto- and allopolyploid taxa of Hepatica (Ranunculaceae).
TLDR
Genome restructuring, especially involving 35S rDNA, within a few million yr or less characterizes evolution of both auto- and allopolyploids and of the diploid species H. asiatica, which is the presumptive ancestor of two other diploids species. Expand
Recent and recurrent polyploidy in Tragopogon (Asteraceae): cytogenetic, genomic and genetic comparisons
TLDR
It is shown that multiple origins of a polyploid species not only affect patterns of genetic variation in natural populations, but also contribute to differential patterns of gene expression and may therefore play a major role in the long-term evolution of polyploids. Expand
Karyotype diversification and evolution in diploid and polyploid South American Hypochaeris (Asteraceae) inferred from rDNA localization and genetic fingerprint data.
TLDR
Early evolution of Hypochaeris in South America was characterized by considerable karyotype differentiation resulting from independent derivations from an ancestral karyotypes, including the apargioides group and its derivatives, which constitute by far the majority of species. Expand
Diploid and polyploid reticulate evolution throughout the history of the perennial soybeans (Glycine subgenus Glycine)
TLDR
The perennial soybeans (Glycine subgenus Glycine), are the sister group of the annual cultivated soybean (G. max), and some recurrent polyploids show evidence of lineage recombination, indicating that their populations comprise a single biological species. Expand
Chloroplast DNA phylogeny, reticulate evolution, and biogeography of Paeonia (Paeoniaceae).
TLDR
A refined hypothesis of species phylogeny of section Paeonia was proposed by considering the discordance between the nuclear and cpDNA phylogenies to be results of hybrid speciation followed by inheritance of cpDNA of one parent and fixation of ITS sequences of another parent. Expand
Chromosome evolution of Pennisetum species (Poaceae): implications of ITS phylogeny
TLDR
Phylogenetic relationships based on internal transcribed spacer (ITS) sequences were used to assess evolutionary trends in genome structure within the genus Pennisetum on the basis of observed variations in genome size, basic chromosome numbers and ploidy level, indicating that the genome structure might have evolved towards a reduced chromosome number and an increased chromosome size. Expand
Phylogeny and systematics of Achillea (Asteraceae-Anthemideae) inferred from nrITS and plastid trnL-F DNA sequences
TLDR
Here and in other groups of Achillea, various instances of conflicting evidence from nrITS, plastid trnL-F, and morphology point to hybridization and lineage sorting. 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 phylogenetics of the Espeletia complex (Asteraceae): evidence from nrDNA ITS sequences on the closest relatives of an Andean adaptive radiation.
  • J. Rauscher
  • Biology, Medicine
  • American journal of botany
  • 2002
TLDR
Gene phylogenies based on maximum parsimony analyses reveal that the Espeletiinae clade is nested well within the subtribe Melampodiinae and thus should be considered a monophyletic complex of species, not a separate subtribe. Expand
Phylogenetic relationships among species of Hypochaeris (Asteraceae, Cichorieae) based on ITS, plastid trnL intron, trnL-F spacer, and matK sequences.
TLDR
Monophyly of species of Hypochaeris from South America is strongly supported by both ITS and the joint matrix of ITS, trnL, and matK data, and low levels of sequence divergence among South American taxa suggest a pattern of rapid speciation, in contrast to much greater divergence among European representatives. Expand
...
1
2
3
4
5
...