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Plant Speciation
Polyploid speciation, in which the entire genome is duplicated, is particularly frequent in plants, perhaps because polyploid plants often exhibit ecological differentiation, local dispersal, high fecundity, perennial life history, and self-fertilization or asexual reproduction. Expand
Chromosomal rearrangements and speciation.
  • L. Rieseberg
  • Medicine, Biology
  • Trends in ecology & evolution
  • 1 July 2001
It is argued that rearrangements reduce gene flow more by suppressing recombination and extending the effects of linked isolation genes than by reducing fitness. Expand
Transgressive segregation, adaptation and speciation
Credence is lent to the view that hybridization may provide the raw material for rapid adaptation and provide a simple explanation for niche divergence and phenotypic novelty often associated with hybrid lineages. Expand
Hybrid Origins of Plant Species
Experimental, theoretical, and empirical studies of homoploid hybrid speciation suggest that it is feasible, although evolutionary conditions are stringent, and hybridization may be important as a stimulus for the genetic or chromosomal reorganization envisioned in founder effect and saltational models of speciation. Expand
Major Ecological Transitions in Wild Sunflowers Facilitated by Hybridization
The same combinations of parental chromosomal segments required to generate extreme phenotypes in synthetic hybrids also occurred in ancient hybrids, and this possibility was tested through phenotypic and genomic comparisons of ancient and synthetic hybrids. Expand
The frequency of polyploid speciation in vascular plants
It is established that 15% of angiosperm and 31% of fern speciation events are accompanied by ploidy increase, and frequency estimates are higher by a factor of four than earlier estimates and lead to a standing incidence of polyploid species within genera of 35% (n = 1,506). Expand
Environmental DNA
This paper presents a new probabilistic procedure called “spot-spot analysis” that allows for direct measurement of the response of the immune system to E.coli. Expand
The sunflower genome provides insights into oil metabolism, flowering and Asterid evolution
It is found that the genomic architecture of flowering time has been shaped by the most recent whole-genome duplication, which suggests that ancient paralogues can remain in the same regulatory networks for dozens of millions of years. Expand
Hybrid zones and the genetic architecture of a barrier to gene flow between two sunflower species.
The utility of hybrid zones for identifying factors contributing to isolation and the prediction of increased resolution relative to controlled crosses are demonstrated and verified. Expand
Predicting the Risk of Extinction through Hybridization
These simulations provide guidance concerning the kinds of data required to evaluate extinction risk and possible conservation strategies, and demonstrate that hybridization is perhaps the most rapidly acting genetic threat to endangered species, with extinction often taking place in less than five generations. Expand