Evolutionary consequences of autopolyploidy.
It is hypothesized that polysomic inheritance may provide a short-term evolutionary advantage for autopolyploids compared to diploid relatives when environmental change enforces range shifts, and should possess increased genome flexibility, allowing them to adapt and persist across heterogeneous landscapes in the long run.
Epigenetic Variation in Mangrove Plants Occurring in Contrasting Natural Environment
- C. Lira-Medeiros, C. Parisod, R. A. Fernandes, Camila Souza da Mata, M. Cardoso, P. Ferreira
- Environmental Science, BiologyPLoS ONE
- 26 April 2010
Co-Inertia analysis, exploring jointly the genetic and epigenetic data, showed that individuals with similar genetic profiles presented divergent epigenetic profiles that were characteristic of the population in a particular environment, suggesting that CpG-methylation changes may be associated with environmental heterogeneity.
Impact of transposable elements on the organization and function of allopolyploid genomes.
Transposable elements (TEs) represent an important fraction of plant genomes and are likely to play a pivotal role in fuelling genome reorganization and functional changes following allopolyploidization, but available evidence indicates that TE proliferation in the short or the long term after allopolyPloidization may be restricted to a few TEs.
Hybridization, polyploidy and invasion: lessons from Spartina (Poaceae)
Nuclear and chloroplast DNA data indicate a reticulate origin (alloheptaploid) of the invasive Spartina densiflora, and Transcriptomic changes suggest possible gene silencing in both hybrids and allopolyploid.
Rapid structural and epigenetic reorganization near transposable elements in hybrid and allopolyploid genomes in Spartina.
- C. Parisod, A. Salmon, T. Zerjal, M. Tenaillon, M. Grandbastien, M. Ainouche
- BiologyNew Phytologist
- 1 December 2009
Evidence of major structural and CpG methylation changes in the vicinity of TE insertions accompanying hybridization, and to a lesser extent, genome doubling is found, indicating that nuclear incompatibilities in Spartina trigger immediate alterations, which are TE-specific with an important epigenetic component.
Climate cooling promoted the expansion and radiation of a threatened group of South American orchids (Epidendroideae: Laeliinae)
These results provide independent evidence that climate cooling following the Middle Miocene Climatic Optimum led to important vegetational shifts in eastern Brazil, causing an increase in the dominance of open versus closed habitats.
Glacial in situ survival in the Western Alps and polytopic autopolyploidy in Biscutella laevigata L. (Brassicaceae)
This study highlights the phylogeographical relationships of maternal lineages in the Western Alps and investigates the polyploidy process using plastid DNA sequences combined with plASTid DNA length polymorphism markers, which were transferable among Brassicaceae species.
Origin and expansion of the allotetraploid Aegilops geniculata, a wild relative of wheat.
It is shown that the evolutionary trajectories of ruderal plants can be similar to those of wild species, but are interfered by human activities, promoting range expansions through increased long-distance dispersal and the creation of suitable habitats, and human-mediated dispersal resulting in substantial introgression between resident and migrant populations.
Natural Pathways to Polyploidy in Plants and Consequences for Genome Reorganization
The last decade highlighted polyploidy as a rampant evolutionary process that triggers drastic genome reorganization, but much remains to be understood about their causes and consequences in both…
Genetic variability and founder effect in the pitcher plant Sarracenia purpurea (Sarraceniaceae) in populations introduced into Switzerland: from inbreeding to invasion.
The results suggest that, under restricted gene flow among families, the species may not only have rapidly purged deleterious alleles, but also have undergone some form of selection for inbreeding due to co-adaptation between loci.