Hybridization, polyploidy and invasion: lessons from Spartina (Poaceae)

@article{Ainouche2008HybridizationPA,
  title={Hybridization, polyploidy and invasion: lessons from Spartina (Poaceae)},
  author={Malika L. Ainouche and Philippe M Fortune and Armel Salmon and Christian Parisod and Marie-Ang{\`e}le Grandbastien and Kenichi Fukunaga and Manuel Ricou and M. T. Misset},
  journal={Biological Invasions},
  year={2008},
  volume={11},
  pages={1159-1173}
}
In this paper, we examine how the Spartina system has helped our understanding of the genomic aspects of allopolyploid speciation in the context of biological invasion. More specifically the respective roles of hybridization and genome duplication in the success of newly formed allopolyploid species are explored. Hybridization appears to have triggered genetic and epigenetic changes in the two recently formed European homoploid hybrids S. × towsendii and S. × neyrautii. Deviation from parental… 
Transcriptomic changes following recent natural hybridization and allopolyploidy in the salt marsh species Spartina x townsendii and Spartina anglica (Poaceae).
TLDR
The results reflect the decoupled effects of the 'genomic shock' following hybridization and genome redundancy on the genetic, epigenetic and regulatory mechanisms characterizing transcriptomic evolution in allopolyploids.
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A comprehensive gene expression study based on individuals sampled in their natural habitat and detected the superimposed effect of environmental heterogeneity, hybridization and allopolyploidy is provided.
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TLDR
Methodological challenges in exploring non-model, highly redundant genomes resulting from superimposed events of polyploidization (such as those encountered in Spartina) and the contribution of the new massive parallel sequencing technologies are discussed.
Evolution of small RNA expression following hybridization and allopolyploidization: insights from Spartina species (Poaceae, Chloridoideae)
TLDR
The central role small RNAs play in shaping regulatory changes in naturally formed recent allopolyploids is confirmed, as well as a strengthen of transposable element repression during theallopolyploidization process.
Polyploid Speciation and Genome Evolution: Lessons from Recent Allopolyploids
TLDR
This chapter focuses on polyploids of hybrid origin (allopolyploids) in two different genera that each have experienced recent allopolyploidy (i.e., duplication of hybrid genomes) and which have been extensively studied, namely Spartina and Gossypium.
The enigmatic invasive Spartina densiflora: A history of hybridizations in a polyploidy context
TLDR
Identification of nuclear homeologous sequences indicate that this species has a reticulate origin in its native range, involving a lineage related to the hexaploid clade formed by S. alterniflora, S. foliosa, and S. maritima.
Similar patterns of rDNA evolution in synthetic and recently formed natural populations of Tragopogon (Asteraceae) allotetraploids
TLDR
Uniparental reductions of homeologous rRNA gene copies occurred in both synthetic and natural populations of Tragopogon allopolyploids, and the extent of these rDNA changes was generally higher in natural populations than in the synthetic lines.
The Early Stages of Polyploidy: Rapid and Repeated Evolution in Tragopogon
TLDR
It is proposed that substantial chromosomal instability results in karyotype restructuring, a likely common process following WGD and a driver of allopolyploid speciation, which has largely unexplored implications for gene losses, gains, and expression patterns.
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.
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