Phylogenetic relationships and reticulation among Asian Elymus (Poaceae) allotetraploids: Analyses of three nuclear gene trees

Mason‐Gamer, Roberta J.; Burns, Melissa M.; Naum, Marianna

doi:10.1016/j.ympev.2009.10.002

Cited by 57 publications

(42 citation statements)

References 84 publications

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“…Thus, close association of polyploidy species with diploid species can be used to infer the maternal genome donor. As Thinopyrum and Dasyspyrum species were also found in the Pseudoroegneria paraphyly, we cannot rule out either as a possible maternal donor to Elymus (Figure 4 and 5), however, studies on nuclear genes and ITS data have indicated that Pseudoroegneria and either Hordeum, Agropyron, or Australopyrum (depending on the Elymus species) are the paternal genome donors to Elymus, while there does not appear to be any additional support for either Thinopyrum or Dasyspyrum as a genome donor to Elymus (Liu et al, 2006;MasonGamer, 2001;Mason-Gamer et al, 2010;Sun et al, 2007;.…”

Section: 4-pseudoroegneria Phylogeny Within the Triticeaementioning

confidence: 81%

“…Further studies, including those on the granule-bound starch synthase I (GBSSI) gene (Mason-Gamer, 2001;MasonGamer et al, 2010), the RPB2 genes (Sun et al, 2008;, ITS of nuclear rDNA (Yu et al, 2008), the EF-G genes (Sun & Komatsuda, 2010; phosphoenolpyruvate carboxylase (Pep-C) (Mason-Gamer et al, 2010) and ß-amylase (Mason-Gamer et al, 2010), have found two distinct clades within the St genome of Pseudoroegneria. In the GBSSI, RPB2, EF-G, and ß-amylase gene phylogenies, P. libanotica and P. tauri have very similar sequences and are sufficiently different from the other diploid Pseudoroegneria so as to form a separate clade (Mason-Gamer et al, 2010;Sun et al, 2008;Sun & Komatsuda, 2010;. This being said, ITS sequences have indicated that P. libanotica, P. tauri, P. spicata and P. strigosa ssp.…”

Section: 4-relationship Within Pseudoroegneriamentioning

confidence: 99%

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Phylogenetic analysis of the genus Pseudoroegneria and the Triticeae tribe using the rbcL gene

Gamache

Sun

2015

Biochemical Systematics and Ecology

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Phylogenetic Analysis of the Genus Pseudoroegneria and the Triticeae Tribe Using the rbcl Gene By Jacques GamachePseudoroegneria are diploid perennial grasses of the Triticeae tribe. The haplome "St" of Pseudoroegneria is shared with several important polyploid species such as Elymus, Kengyilia and, Elytrigia. Due to frequent hybridizations and complex genetic mechanisms, the relationships within Pseudoroegneria, and within the Triticeae, have been heavily disputed. Using the chloroplast rbcL gene I estimated the nucleotide diversity of 8 Pseudoroegneria species, and additionally examined the phylogenetic relationships within Pseudoroegneria and of Pseudoroegneria within the larger context of Triticeae. The estimates of nucleotide diversity indicated that P. tauri and P. spicata species had the highest diversity, while P. gracillima had the lowest. The phylogenetic analysis of Pseudoroegneria placed all P. spicata sequences into a clade separate from the other Pseudoroegneria, while the relationship of the other Pseudoroegneria species could not be determined. Due to the groupings of Pseudoroegneria with the polyploid Elymus, our results strongly support Pseudoroegneria as the maternal genome donor to Elymus. There was also weak support for the idea that P. spicata may be the maternal genome donor to the StH Elymus species.

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Section: 4-pseudoroegneria Phylogeny Within the Triticeaementioning

confidence: 81%

Section: 4-relationship Within Pseudoroegneriamentioning

confidence: 99%

Phylogenetic analysis of the genus Pseudoroegneria and the Triticeae tribe using the rbcL gene

Gamache

Sun

2015

Biochemical Systematics and Ecology

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“…Therefore, the accumulated evidence suggests that the Elymus Y-genome originated in a different species or in multiple species. Unless a similar genome is identified in another grass, the donor of the Y-genome may never be identified (Mason-Gamer et al, 2010a;Mason-Gamer, 2013).…”

Section: Results and Discussion Nrits Treementioning

confidence: 99%

Phylogenetic analysis of Elymus (Poaceae) in western China

2015

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ABSTRACT. Elymus L. is often planted in temperate and subtropical regions as forage. Species in the genus have 5 allopolyploid genomes that are found in the grass tribe Triticeae. To determine the phylogenetic relationships in Elymus species from western China, we estimated phylogenetic trees using sequences from the nuclear ribosomal internal transcribed spacer and non-coding chloroplast DNA sequences from 56 accessions (871 samples) of 9 polyploid Elymus species and 42 accessions from GenBank. Tetraploid and hexaploid Elymus species from western China had independent origins, and Elymus species from the same area or neighboring geographic regions were the most closely related. Based on the phylogenetic tree topology, the St-and Y-genomes were not derived from the same donor and Y-genome likely originated from the H-genome of Hordeum species, or they shared the same origin or underwent introgression. The maternal genome of tetraploid and hexaploid Elymus species originated from species of Hordeum or Pseudoroegneria.

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“…In the Roegneria genus, the Y genome may have a similar origin and evolutionary history to the St genome (Lu and Salomon 2004;Liu et al 2006). Different hypotheses regarding the origin of Y genome have been suggested, and the origin is still under debate (reviewed in Sun and Salomon 2009;Mason-Gamer et al 2010). Regardless of the origin of Y genome, it appears that the addition of an H genome brings complexity to the entire genetic pool of hexaploid C. nutans.…”

Section: Allelic Ancestry and Evolutionary Comparison Between Hexaplomentioning

confidence: 99%

Markers associated with altitude and ecological factors in hexaploid Campeiostachys nutans (Griseb.) J. L. Yang, B. R. Baum et C. Yen and tetraploid Roegeneria nutans (Keng) Keng

Guo

Wang

Yan

et al. 2013

Genet Resour Crop Evol

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The genetic basis of adaptation can be unraveled directly at the genome level, without regard to selectively advantageous genes or traits. Genetic variation and adaptation of polyploidy in the evolution of plants is becoming an area of intense interest. Whether hexaploid wheatgrass species has higher adaptability to altitude than tetraploid or not needs to be proofed by population genomic data. A fluorescence-based AFLP technique was used to investigate the allele share of hexaploid Campeiostachys nutans (Griseb.) J. L. Yang, B. R. Baum et C. Yen and tetraploid Roegeneria nutans (Keng) Keng as well as the genetic variation and natural selection in 22 natural populations and their association with ecological factors. Of all the AFLP bands, 84.29 % were found in common between two different ploidy wheatgrasses. In addition, we found that hexapoid C. nutans had 1.45 times the allelic frequency and more large-sized bands than tetraploid R. nutans. After genetic analyses, the next factor examined should be the effect of altitude on genetic variation. There were no significant inter-population genetic differentiations, suggesting that distance did not contribute to spatial isolation. Altitude and soil nutrient availability might play an important role in maintaining the genetic diversity. A certain percentage of positive selection loci were discovered in total genome allele. Hexaploid wheatgrass with higher ploidy numbers can show strong genetic adaptability to adverse high-altitude condition because of its complex genomic background with an additional H genome, which supports our hypothesis. Though this evolutionary process is believed to be the driving force behind sympatric speciation, we cannot forecast that hexaploid wheatgrass species will diversify into two species in the long term, but believe that diversification under local selection helps to increase the adaptability to the changes in altitude.

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Phylogenetic relationships and reticulation among Asian Elymus (Poaceae) allotetraploids: Analyses of three nuclear gene trees

Cited by 57 publications

References 84 publications

Phylogenetic analysis of the genus Pseudoroegneria and the Triticeae tribe using the rbcL gene

Phylogenetic analysis of the genus Pseudoroegneria and the Triticeae tribe using the rbcL gene

Phylogenetic analysis of Elymus (Poaceae) in western China

Markers associated with altitude and ecological factors in hexaploid Campeiostachys nutans (Griseb.) J. L. Yang, B. R. Baum et C. Yen and tetraploid Roegeneria nutans (Keng) Keng

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