Cytoplasmic Inheritance and Reciprocal Amphiploidy in Tragopogon

Ownbey, Marion; McCollum, Greg

doi:10.1002/j.1537-2197.1953.tb06556.x

Cited by 59 publications

(46 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Multivalents were also observed at a low frequency in natural populations of T. mirus and T. miscellus [13] and in the few F 2 plants resulting from diploid F 1 hybrids of Tragopogon [35]. Meiotic abnormalities can cause unequal segregation of homeologous chromosomes and are a likely driver of the chromosomal imbalance between genomes observed in both Tragopogon allotetraploids.…”

Section: Discussionmentioning

confidence: 99%

Rapid Chromosome Evolution in Recently Formed Polyploids in Tragopogon (Asteraceae)

et al. 2008

View full text Add to dashboard Cite

BackgroundPolyploidy, frequently termed “whole genome duplication”, is a major force in the evolution of many eukaryotes. Indeed, most angiosperm species have undergone at least one round of polyploidy in their evolutionary history. Despite enormous progress in our understanding of many aspects of polyploidy, we essentially have no information about the role of chromosome divergence in the establishment of young polyploid populations. Here we investigate synthetic lines and natural populations of two recently and recurrently formed allotetraploids Tragopogon mirus and T. miscellus (formed within the past 80 years) to assess the role of aberrant meiosis in generating chromosomal/genomic diversity. That diversity is likely important in the formation, establishment and survival of polyploid populations and species.Methodology/Principal FindingsApplications of fluorescence in situ hybridisation (FISH) to natural populations of T. mirus and T. miscellus suggest that chromosomal rearrangements and other chromosomal changes are common in both allotetraploids. We detected extensive chromosomal polymorphism between individuals and populations, including (i) plants monosomic and trisomic for particular chromosomes (perhaps indicating compensatory trisomy), (ii) intergenomic translocations and (iii) variable sizes and expression patterns of individual ribosomal DNA (rDNA) loci. We even observed karyotypic variation among sibling plants. Significantly, translocations, chromosome loss, and meiotic irregularities, including quadrivalent formation, were observed in synthetic (S0 and S1 generations) polyploid lines. Our results not only provide a mechanism for chromosomal variation in natural populations, but also indicate that chromosomal changes occur rapidly following polyploidisation.Conclusions/SignificanceThese data shed new light on previous analyses of genome and transcriptome structures in de novo and establishing polyploid species. Crucially our results highlight the necessity of studying karyotypes in young (<150 years old) polyploid species and synthetic polyploids that resemble natural species. The data also provide insight into the mechanisms that perturb inheritance patterns of genetic markers in synthetic polyploids and populations of young natural polyploid species.

show abstract

Section: Discussionmentioning

confidence: 99%

Rapid Chromosome Evolution in Recently Formed Polyploids in Tragopogon (Asteraceae)

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Furthermore, interpopulational cpDNA variation in T. dubius permitted the identification of the parental populations of the Pullman T. miscellus. Despite intensive previous study of both T. mirus and T. miscellus Ownbey and McCollum, 1953;, multiple origins of these tetraploids had not been demonstrated conclusively. The complementary use of rDNA and cpDNA markers provides definitive evidence for multiple origins of both T. mirus and T. miscellus within the narrow geographic limits of the Palouse.…”

Section: Multiple Origins Of Polyploid Speciesmentioning

confidence: 93%

“…Allozymic and morphologic (Ownbey and McCollum, 1953) markers suggested multiple origins of T. mirus and T. miscellus, respectively, although the data were equivocal.…”

Section: Multiple Origins Of Polyploid Speciesmentioning

confidence: 96%

“…Although allozymic and morphologic data have been useful in documenting multiple origins of some polyploid species (Werth et aI., 1985b;Ranker et aI., 1989), these markers have provided at best equivocal evidence for multiple origins of others (Ownbey and McCollum, 1953;. The complementary use ofrDNA and cpDNA markers has proven to be a valuable approach not only for unraveling the parentage of polyploid species but also for detecting multiple origins of polyploids.…”

Section: Multiple Origins Of Polyploid Speciesmentioning

confidence: 99%

See 1 more Smart Citation

Molecular Systematics of Plants

Soltis¹,

Soltis²,

Doyle³

1992

201

View full text Add to dashboard Cite

F Of more intormation contact:AlI rights reserved. No part ofthis book covered by the copyright hereon may be reproduced Of used in any form or by any means--graphic, electronic. Of mechanical, inc1uding photocopying. recording. taping, Of intonnation storage and retrieval systems--without the written pennission of the publisher.2 3 4 5 6 7 8 9 XXX OI 00 99 98 97 96 Library of Congress Cataloging-ill-Publicatioll DataMolocular systematics ofplaots / edited by Pamela S. Sollis. Douglas E. Sollis, and Jelt' J. Doyle. p. em. lncludes bibliographical references and index.

show abstract

“…It was originally believed that allopolyploids consistently result from a single origination event, giving rise to an initially genetically uniform new species (Ownbey and Mccollum ; Soltis et al. ).…”

Section: Introductionmentioning

confidence: 99%

Genetic structure reveals a history of multiple independent origins followed by admixture in the allopolyploid weed Salsola ryanii

Welles

Ellstrand

2016

Evolutionary Applications

View full text Add to dashboard Cite

It has recently become clear that many invasive species have evolved in situ via hybridization or polyploidy from progenitors which themselves are introduced species. For species formed by hybridization or polyploidy, genetic diversity within the newly formed species is influenced by the number of independent evolutionary origins of the species. For recently formed species, an analysis of genetic structure can provide insight into the number of independent origin events involved in the formation of the species. For a putative invasive allopolyploid species, the number of origins involved in the species formation, the genetic diversity present within these origins, and the level of gene flow between independent origins determines the genetic composition of the neospecies. Here we analyze the genetic structure of the newly formed allopolyploid species, Salsola ryanii, a tumbleweed which evolved within the last 20–100 years in California. We utilize the genetic structure analysis to determine that this new species is the result of at least three independent allopolyplodization events followed by gene flow between the descendants of independent origins.

show abstract

Cytoplasmic Inheritance and Reciprocal Amphiploidy in Tragopogon

Cited by 59 publications

References 6 publications

Rapid Chromosome Evolution in Recently Formed Polyploids in Tragopogon (Asteraceae)

Rapid Chromosome Evolution in Recently Formed Polyploids in Tragopogon (Asteraceae)

Molecular Systematics of Plants

Genetic structure reveals a history of multiple independent origins followed by admixture in the allopolyploid weed Salsola ryanii

Contact Info

Product

Resources

About