Polyploidy: recurrent formation and genome evolution

Soltis, Douglas E.; Soltis, Pamela S.

doi:10.1016/s0169-5347(99)01638-9

Cited by 960 publications

(777 citation statements)

References 40 publications

Supporting

Mentioning

750

Contrasting

Unclassified

Order By: Relevance

“…These topologies indicated that ITSs in different D. wangii accessions showed a clear linkage with their related diploid ancestors, which further support the allotetraploid origin of D. wangii (Yen et al 2005;Baum and Johnson 2008). In addition, the ITS tree in this study also suggested a multiple origin of D. wangii resulting from recurrent hybridization, which can be shown by different accessions of the same species, will appear at different clades of a phylogenetic tree (Soltis and Soltis 1999). For example, D. wangii 4, 5, and 6 were grouped in different subclades of the St clade.…”

Section: Phylogenetic Analysissupporting

confidence: 73%

“…Internal transcribed spacer type evolution Recent research suggested that hybridization and polyploidization can lead to genome complicated change within hybrids (e.g., Soltis and Soltis 1999;Soltis and Soltis 2009). On the other hand, empirical studies of the fate of nrDNA loci after polyploidy indicated the evolution of nrDNA loci exhibit a range of pattern, from the maintenance of both homeologous loci to the rapid loss of a locus or interlocus homogenization between homeologous loci (e.g., Rauscher et al 2004).…”

Section: Phylogenetic Analysismentioning

confidence: 99%

“…Many studies on the evolution of polyploid complexes have shown that recurrent formation and multiple origins of polyploids are the rule rather than the exception (e.g., Soltis and Soltis 1999). The origin of polyploids and the mechanisms underlying the establishment of newly evolved taxa and populations are among the most challenging questions in plant sciences (e.g., Soltis and Soltis 1999). Molecular tools…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Polyploidy origin of wheatgrass Douglasdeweya wangii (Triticeae, Poaceae): evidence from nuclear ribosomal DNA internal transcribed spacer and chloroplast trnL–F sequences

Liu

et al. 2010

Dev Genes Evol

View full text Add to dashboard Cite

To study hybrid speciation in wheatgrass Douglasdeweya wangii and to investigate the evolutionary pattern of nuclear ribosomal DNA (nrDNA) internal transcribed spacer sequences (ITSs) in allotetraploids, DNA sequence variation of ITSs and chloroplast trnL-F sequences from D. wangii and its putative donors were analyzed. The ITSs revealed that D. wangii had an StP genome composition. Most accessions of D. wangii had one parental ITS copy in their genome, one accession had two parental ITSs. The trnL-F sequences revealed an especially close relationship of Pseudoroegneria to all D. wangii individuals included, and the two accessions of Pseudoroegneria tauri (PI401324 and PI401331) were maternal candidates of the studied D. wangii individuals. Both of ITS and trnL-F trees suggested multiple origins and recurrent hybridization of D. wangii. Thus, the results suggested that: (1) the St and P genome in allotetraploid D. wangii were donated by Pseudoroegneria and Agropyron, respectively;(2) Pseudoroegneria was the maternal donor of D. wangii, and P. tauri 26 (accession PI401324) and P. tauri 27 (accession PI401331) were most likely the potential candidates of maternal donors; (3) D. wangii individuals studied here showed multiple origins and experienced recurrent hybridization; and (4) bidirectional interlocus concerted evolution of ITSs had occurred in most D. wangii accessions, while in one accession concerted evolution among homeologous loci did not occur.

show abstract

Section: Phylogenetic Analysissupporting

confidence: 73%

Section: Phylogenetic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Polyploidy origin of wheatgrass Douglasdeweya wangii (Triticeae, Poaceae): evidence from nuclear ribosomal DNA internal transcribed spacer and chloroplast trnL–F sequences

Liu

et al. 2010

Dev Genes Evol

View full text Add to dashboard Cite

show abstract

“…These Wshes represent an interesting model for studying lineage speciWc genome duplication events. Furthermore, polyploidization is believed to be an important evolutionary aspect in animals, as it is in plants (e.g., Soltis and Soltis, 1999;Le Comber and Smith, 2004;Crow et al, 2006). However, the timing of the polyploid events in these acipenseriform Wshes remains uncertain.…”

Section: Introductionmentioning

confidence: 99%

Age and biogeography of major clades in sturgeons and paddlefishes (Pisces: Acipenseriformes)

Peng

Ludwig

Wang

et al. 2007

Molecular Phylogenetics and Evolution

145

119

View full text Add to dashboard Cite

“…Some allopolyploids are formed through multiple origins and by reciprocal crosses (with different combinations of maternal cytoplasm and paternal nucleus) such as in Tragopogon (46) and Brassica, (47) whereas others are formed by single or a few hybridization events, such as in cotton, (48) wheat (49) and Arabidopsis. (50) The new allopolyploids may cross-hybridize to diploid or autopolyploid progenitors and form hybrid zones in which the polyploids, progenitors and their intermediate forms coexist.…”

mentioning

confidence: 99%

Mechanisms of genomic rearrangements and gene expression changes in plant polyploids

2006

View full text Add to dashboard Cite

SummaryPolyploidy is produced by multiplication of a single genome (autopolyploid) or combination of two or more divergent genomes (allopolyploid). The available data obtained from the study of synthetic (newly created or human-made) plant allopolyploids have documented dynamic and stochastic changes in genomic organization and gene expression, including sequence elimination, inter-chromosomal exchanges, cytosine methylation, gene repression, novel activation, genetic dominance, subfunctionalization and transposon activation. The underlying mechanisms for these alterations are poorly understood. To promote a better understanding of genomic and gene expression changes in polyploidy, we briefly review origins and forms of polyploidy and summarize what has been learned from genome-wide gene expression analyses in newly synthesized autoand allopolyploids. We show transcriptome divergence between the progenitors and in the newly formed allopolyploids. We propose models for transcriptional regulation, chromatin modification and RNA-mediated pathways in establishing locus-specific expression of orthologous and homoeologous genes during allopolyploid formation and evolution. Polyploidy and its formsPolyploidy occurs throughout the evolutionary history of all eukaryotes, (1,2) predominately in flowering plants (3,4) including many important agricultural crops. (5) Compared to plants, polyploidy occurs rarely in animals, but clearly exists in some invertebrates (e.g. insects) and vertebrates (e.g. fish, amphibians and reptiles). (4,6) The relative paucity of polyploidy in animals is attributed to the delicate schemes of sex determination and animal development, which are disrupted by polyploidization. (7,8) Therefore, polyploid animals rarely exist. (9) Moreover, aneuploid and polyploid cells in animals and human are often associated with malignant cell proliferation or carcinogenesis. (10) However, endopolyploidy (somatic polyploid cells within a diploid individual) appears to be a physiological response to developmental changes in plants and some animals, (11,12) indicating plasticity of plant and animal genomes. In the post-sequencing era, polyploidy is proving to be a fascinating and challenging field of plant biology, stimulating many research advances and insightful reviews. (2,13 -24) Here we attempt to update the views using genomic-scale results and provide new mechanistic insights.Historically, Winkler (1916) introduced the term polyploidy, (25) and Winge (1917) called attention to the general importance of polyploidy in the evolution of angiosperms. (26) At that time, research in polyploidy was somewhat limited by the plant and animal materials that were available in nature. In 1937, Blakeslee and Avery induced polyploidy in plants using colchicine, a chemical inhibitor of mitotic cell divisions. (27) The technique has been successfully used to induce chromosome doubling in meristemic cells of diploids and interspecific hybrids. Doubling a single 'diploid' genome results in an autotetraploid, while doubling c...

show abstract

Polyploidy: recurrent formation and genome evolution

Cited by 960 publications

References 40 publications

Polyploidy origin of wheatgrass Douglasdeweya wangii (Triticeae, Poaceae): evidence from nuclear ribosomal DNA internal transcribed spacer and chloroplast trnL–F sequences

Polyploidy origin of wheatgrass Douglasdeweya wangii (Triticeae, Poaceae): evidence from nuclear ribosomal DNA internal transcribed spacer and chloroplast trnL–F sequences

Age and biogeography of major clades in sturgeons and paddlefishes (Pisces: Acipenseriformes)

Mechanisms of genomic rearrangements and gene expression changes in plant polyploids

Contact Info

Product

Resources

About