NONUNIFORM PROCESSES OF CHROMOSOME EVOLUTION IN SEDGES (CAREX: CYPERACEAE)

@inproceedings{Hipp2007NONUNIFORMPO,
  title={NONUNIFORM PROCESSES OF CHROMOSOME EVOLUTION IN SEDGES (CAREX: CYPERACEAE)},
  author={Andrew L. Hipp},
  booktitle={Evolution; international journal of organic evolution},
  year={2007}
}
  • A. Hipp
  • Published in
    Evolution; international…
    1 September 2007
  • Biology, Medicine
Abstract Holocentric chromosomes—chromosomes that lack localized centromeres—occur in numerous unrelated clades of insects, flatworms, and angiosperms. Chromosome number changes in such organisms often result from fission and fusion events rather than polyploidy. In this study, I test the hypothesis that chromosome number evolves according to a uniform process in Carex section Ovales (Cyperaceae), the largest New World section of an angiosperm genus renowned for its chromosomal variability and… Expand
The Evolution of Chromosome Arrangements in Carex (Cyperaceae)
TLDR
An integration of biosystematic, cytogenetic, and genomic studies across the Cyperaceae will be needed to address the question of what role chromosome evolution plays in species diversification within Carex and the CyPeraceae as a whole. Expand
Macroevolutionary insights into sedges (Carex: Cyperaceae): The effects of rapid chromosome number evolution on lineage diversification
TLDR
The hypothesis that high recombination rates are selected when evolutionary innovation is required is investigated, using chromosome number evolution as a proxy for recombination rate, and significant correlations between morphology and climatic niche and chromosome number in Carex are demonstrated. Expand
Karyotype stability and predictors of chromosome number variation in sedges: a study in Carex section Spirostachyae (Cyperaceae).
TLDR
This gradual model of chromosome evolution contrasts with the shifting equilibrium model previously identified in a younger section of the same genus, suggesting that section Spirostachyae may have a more slowly evolving karyotype. Expand
Evolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies
TLDR
Low underdominace of chromosomal rearrangements and/or prevalence of the recombination-suppression model over the hybrid-sterility model of chromosome speciation are the most common engines of the runaway chromosome number change observed. Expand
Selection and inertia in the evolution of holocentric chromosomes in sedges (Carex, Cyperaceae).
TLDR
It is argued that the finding of small but significant effects of life history and ecology is compatible with the original hypothesis regarding selection of optima in recombination rates: low recombination rate is optimal when inmediate fitness is required. Expand
Inferring hypothesis-based transitions in clade-specific models of chromosome number evolution in sedges (Cyperaceae).
TLDR
The role of chromosomal rearrangements on lineage diversification is elucidated by analyzing a new comprehensive sedge (Cyperaceae) phylogenetic tree and a complex, heterogeneous model composed of different clade-specific chromosome evolution transitions are significantly supported against the null hypothesis. Expand
Unscrambling phylogenetic effects and ecological determinants of chromosome number in major angiosperm clades
TLDR
An evolutionary role of chromosome number variation is supported, and it is argued that environmental stability favours higher recombination rates in comparison to unstable environments, and insight is provided into the presumptive ecological significance of polyploidy. Expand
Evolution of genome size in Carex (Cyperaceae) in relation to chromosome number and genomic base composition.
TLDR
It is concluded that the evolution of genome and karyotype in Carex is promoted by frequent chromosomal fissions/fusions, rare polyploidy and common repetitive DNA proliferation/removal. Expand
Dynamics of chromosome number and genome size variation in a cytogenetically variable sedge (Carex scoparia var. scoparia, Cyperaceae).
TLDR
Chromosome rearrangements within cytogenetically variable Carex species are more likely a consequence of fission and fusion than of duplication and deletion, which suggests the potential for rapid chromosome evolution by fissions at a relatively fine geographic scale (<350 km). Expand
CHROMOSOME NUMBER EVOLVES INDEPENDENTLY OF GENOME SIZE IN A CLADE WITH NONLOCALIZED CENTROMERES (CAREX: CYPERACEAE)
TLDR
It is hypothesize that this decoupling of genome size from chromosome number helps explain the high lability of chromosome number in the genus, as it reduces indirect selection on chromosome number. Expand
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The Evolution of Chromosome Arrangements in Carex (Cyperaceae)
TLDR
An integration of biosystematic, cytogenetic, and genomic studies across the Cyperaceae will be needed to address the question of what role chromosome evolution plays in species diversification within Carex and the CyPeraceae as a whole. Expand
CHROMOSOME EVOLUTION IN CYPERALES
TLDR
This project includes the creation of bacterial artificial chromosome and expressed sequence tagged libraries to be used in physical and genetic linkage mapping studies in order to reveal the patterns of genome structural variation associated with agmatoploidy in Carex, and to explore the sequence and genie characteristics of chromosome break points in the genome. Expand
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Evidence of a direct role for chromosomal rearrangements in the final stages of animal speciation is found, likely to have contributed to the explosive speciation rate observed in Agrodiaetus, 1.6 species per million years. Expand
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Phylogenetic analysis of amplified fragment length polymorphisms (AFLP) was used to infer patterns of morphologic and chromosomal evolution in an eastern North American group of sedges (ENA clade IExpand
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Developing a comprehensive infrasectional classification with a phylogenetic basis would be complicated by the fact that most of the novel morphological characters in the section have evolved within relatively small, independent clades. Expand
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The phylogenetic distribution of clades with an exceedingly high number of species suggests that traits that confer high rates of diversification evolved independently in different instances and do not characterize the angiosperms as a whole. Expand
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The authors' data indicate that Agrodiaetus is monophyletic, and representatives of the genus Polyommatus (sensu stricto) are the closest relatives. Expand
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Using a silver-staining technique for the nucleolar organiser regions (NORs), three pairs of chromosomes, in the basic 2n=26 karyotype, have been positively identified and raises important questions concerning the (cyto)taxonomic status of N. lapillus in different parts of its range. Expand
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The rearranged chromosomes appear to affect the reproductive barrier between karyotypic species, although the strength of this effect depends on the complexity of the hybrids produced, as well as the chromosome composition of populations. Expand
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TLDR
The chromosome configuration at the IMs of the intraspecific hybrid of Carex oxyandra, C. gibba, and C. parciflora, and the previously undisclosed structural hybridity is disclosed, i.e. the allopolyploid nature of this species is disclosed. Expand
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