Biosystematic research in Aegilops and Triticum

Waines, J. G.; Barnhart, D. Michael

doi:10.1111/j.1601-5223.1992.tb00825.x

Cited by 44 publications

(17 citation statements)

References 13 publications

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“…In agreement with the first hypothesis, Pseudoroegneria and Hordeum hybridized and were at the origin of the species-rich allotetraploid genus Elymus [23,30]. If recent interspecific introgression were responsible for the incongruence pattern we observed it would likely proceed via polyploids because all genera investigated here are currently intersterile [71-74]. Polyploids could serve as bridges of genes between diploid species [22].…”

Section: Discussionsupporting

confidence: 87%

Multigenic phylogeny and analysis of tree incongruences in Triticeae (Poaceae)

et al. 2011

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BackgroundIntrogressive events (e.g., hybridization, gene flow, horizontal gene transfer) and incomplete lineage sorting of ancestral polymorphisms are a challenge for phylogenetic analyses since different genes may exhibit conflicting genealogical histories. Grasses of the Triticeae tribe provide a particularly striking example of incongruence among gene trees. Previous phylogenies, mostly inferred with one gene, are in conflict for several taxon positions. Therefore, obtaining a resolved picture of relationships among genera and species of this tribe has been a challenging task. Here, we obtain the most comprehensive molecular dataset to date in Triticeae, including one chloroplastic and 26 nuclear genes. We aim to test whether it is possible to infer phylogenetic relationships in the face of (potentially) large-scale introgressive events and/or incomplete lineage sorting; to identify parts of the evolutionary history that have not evolved in a tree-like manner; and to decipher the biological causes of gene-tree conflicts in this tribe.ResultsWe obtain resolved phylogenetic hypotheses using the supermatrix and Bayesian Concordance Factors (BCF) approaches despite numerous incongruences among gene trees. These phylogenies suggest the existence of 4-5 major clades within Triticeae, with Psathyrostachys and Hordeum being the deepest genera. In addition, we construct a multigenic network that highlights parts of the Triticeae history that have not evolved in a tree-like manner. Dasypyrum, Heteranthelium and genera of clade V, grouping Secale, Taeniatherum, Triticum and Aegilops, have evolved in a reticulated manner. Their relationships are thus better represented by the multigenic network than by the supermatrix or BCF trees. Noteworthy, we demonstrate that gene-tree incongruences increase with genetic distance and are greater in telomeric than centromeric genes. Together, our results suggest that recombination is the main factor decoupling gene trees from multigenic trees.ConclusionsOur study is the first to propose a comprehensive, multigenic phylogeny of Triticeae. It clarifies several aspects of the relationships among genera and species of this tribe, and pinpoints biological groups with likely reticulate evolution. Importantly, this study extends previous results obtained in Drosophila by demonstrating that recombination can exacerbate gene-tree conflicts in phylogenetic reconstructions.

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Section: Discussionsupporting

confidence: 87%

Multigenic phylogeny and analysis of tree incongruences in Triticeae (Poaceae)

et al. 2011

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“…This concurs with observations of some molecular studies since the study of biochemical characters for high molecular weight glutinen subunits in T. monococcum revealed that these characters are quite different from their parallels in T. urartu (Ciaffi et al 1998). This reflects the reproductive isolation of the two species and agrees with their bioclassification treatment and the new naming which consider T. urartu a separate species from T. monococcum (Waines and Barnhart 1992;Morrison 1993). This, in turns, interprets the separation of the two species in the tree based on protein analysis.…”

Section: Genetic Relationships Among Triticum Speciessupporting

confidence: 67%

Comparison of the efficiency of A–PAGE and SDS–PAGE, ISSRs and RAPDs in resolving genetic relationships among Triticum and Aegilops species

Haider

Nabulsi

MirAli

2010

Genet Resour Crop Evol

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Species that belong to the genus Triticum L. and the genetically related Aegilops L. genus are important genetic and economic resources because they have an evolutionary relationship with the two main agricultural crops T. aestivum (bread wheat) and T. durum (durum wheat). Therefore, it is important to understand the genetic relationships among the cultivated wheat species and their wild relatives. The latter have a great role in the improvement of cultivated wheat. Molecular markers are the best choice and most reliable means to study these relationships accurately. In this study, we compared the efficiency of the biochemical methods A-PAGE and SDS-PAGE on seed storage proteins and the molecular methods RAPDs and ISSRs to explore the genetic relationships among seven species of Triticum and 20 Aegilops species. Three phylogenetic trees obtained in this study were compared with available classifications and phylogenetic trees constructed earlier for these species. It was noted that the tree based on ISSRs data was the most congruent with those classification and trees. This may be attributed to the fact that ISSRs is more specific, and therefore more reliable. This study is the first to study genetic relationships among all species studied here using biochemical and molecular techniques.

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“…However, several studies indicated that the B genome of wheat has significantly diverged from all potential extant wild progenitors, although it is closer to A. speltoides than to any of the other Sitopsis genomes3536. Hence, the majority of evidence seems to suggest that A. speltoides is the most likely living relatives of B genomes donor species910.…”

Section: Resultsmentioning

confidence: 99%

Genome-wide characterization of microsatellites in Triticeae species: abundance, distribution and evolution

Deng

Wang

Feng

et al. 2016

Sci Rep

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Microsatellites are an important constituent of plant genome and distributed across entire genome. In this study, genome-wide analysis of microsatellites in 8 Triticeae species and 9 model plants revealed that microsatellite characteristics were similar among the Triticeae species. Furthermore, genome-wide microsatellite markers were designed in wheat and then used to analyze the evolutionary relationship of wheat and other Triticeae species. Results displayed that Aegilops tauschii was found to be the closest species to Triticum aestivum, followed by Triticum urartu, Triticum turgidum and Aegilops speltoides, while Triticum monococcum, Aegilops sharonensis and Hordeum vulgare showed a relatively lower PCR amplification effectivity. Additionally, a significantly higher PCR amplification effectivity was found in chromosomes at the same subgenome than its homoeologous when these markers were subjected to search against different chromosomes in wheat. After a rigorous screening process, a total of 20,666 markers showed high amplification and polymorphic potential in wheat and its relatives, which were integrated with the public available wheat markers and then anchored to the genome of wheat (CS). This study not only provided the useful resource for SSR markers development in Triticeae species, but also shed light on the evolution of polyploid wheat from the perspective of microsatellites.

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Biosystematic research in Aegilops and Triticum

Cited by 44 publications

References 13 publications

Multigenic phylogeny and analysis of tree incongruences in Triticeae (Poaceae)

Multigenic phylogeny and analysis of tree incongruences in Triticeae (Poaceae)

Comparison of the efficiency of A–PAGE and SDS–PAGE, ISSRs and RAPDs in resolving genetic relationships among Triticum and Aegilops species

Genome-wide characterization of microsatellites in Triticeae species: abundance, distribution and evolution

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