<i>Douglasdeweya</i>: A new genus, with a new species and a new combination (Triticeae: Poaceae)

Yen, Chi; Yang, Junliang; Baum, Bernard R.

doi:10.1139/b05-018

Cited by 32 publications

(22 citation statements)

References 8 publications

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“…For example, D. wangii 4 was included in the St and P clades; D. wangii 5 and 6 were grouped within the St clade; D. wangii 1, 2 and 3 were included in the P clade. 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).…”

Section: Phylogenetic Analysissupporting

confidence: 73%

“…It was originally included in Pseudoroegneria (Nevski) Á. Löve until recently when a new treatment was made by Yen et al (2005). Cytological data and molecular analysis of 5S rDNA sequences suggested that D. wangii has the StP genome composition, suggesting that the St genome was donated by the genus Pseudoroegneria and the P genome by the genus Agropyron (Yen et al 2005;Baum and Johnson 2008). However, hybrid speciation of D. wangii is still unknown.…”

Section: Communicated By K Schneitzmentioning

confidence: 99%

“…Origins of wheatgrass D. wangii allotetraploids Based on the genomic classification in the Triticeae, D. wangii was treated separately from Pseudoroegneria and grouped in the new genus Douglasdeweya (Yen et al 2005). Only limited molecular studies addressing the genomic constitution of D. wangii are reported (Baum and Johnson 2008).…”

Section: Phylogenetic Analysismentioning

confidence: 99%

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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

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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.

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Section: Phylogenetic Analysissupporting

confidence: 73%

Section: Communicated By K Schneitzmentioning

confidence: 99%

Section: Phylogenetic Analysismentioning

confidence: 99%

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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

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“…The cytogenetic studies indicated that there are St, StSt, StP and E e St genomic constitutions in Pseudoroegneria and all of them are diploids or tetraploids (Dewey 1984;Wang et al 1986;Jensen et al 1992;Liu & Wang 1993). Yen et al (2005a) established a new genus Douglasdeweya C. Yen, J.L. Yang & B.R.…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic relationships of species in Pseudoroegneria (Poaceae: Triticeae) and related genera inferred from nuclear rDNA ITS (internal transcribed spacer) sequences

Fan

Zhang

et al. 2008

Biologia

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To evaluate the phylogenetic relationships of species in Pseudoroegneria and related genera, the nuclear ribosomal internal transcribed spacer (ITS) sequences were analyzed for eighteen Pseudoroegneria (St), two Elytrigia (E e St), two Douglasdeweya (StP), three Lophopyrum (E e andE b ), three Agropyron (P), two Hordeum (H), two Australopyrum (W) and two Psathyrostachys (Ns) accessions. The main results were: (i) Pseudoroegneria gracillima, P. stipifolia, P. cognata and P. strigosa (2x) were in one clade, while P. libanotica, P. tauri and P. spicata (2x) were in the other clade, indicating there are the differentiations of St genome among diploid Pseudoroegneria species; (ii) P. geniculata ssp. scythica, P. geniculata ssp. pruinifera, Elytriga caespitosa and Et. caespitosa ssp. nodosa formed the E e St clade with 6-bp indel in ITS1 regions; and (iii) Douglasdeweya wangii, D. deweyi, Agropyron cristatum and A. puberulum comprised the P clade. It is unreasonable to treat P. geniculata ssp. scythica and P. geniculata ssp. pruinifera as the subspecies of P. geniculata, and they should be transferred to a new genus Trichopyrum, which consists of species with E e St genomes. It is also suggested that one of the diploid donor of D. wangii and D. deweyi is derived from Agropyron species, and it is reasonable to treat tetraploid species with StP genomes into Douglasdeweya.

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“…Thinopyrum, as treated here, includes species with just the E genome or both the E and the St genome. The latter species are sometimes placed in Trichopyrum (Löve 1986, Yen et al 2005.…”

Section: Genomic Compositionmentioning

confidence: 99%

Morphological identification of genomic genera in the Triticeae

et al. 2009

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, Northwest Frontier Province, PakistanOur goal was to determine whether the genomic groups of perennial species Triticeae having solitary spikelets could be identified morphologically and, if so, to construct identification keys that could be used for this purpose. If so, it would strengthen the argument for recognizing such groups as genera. We conducted Discriminant and Random Forest ® analyses of 61 characters scored on 218 herbarium specimens representing 13 genomic groups. In addition, we closely examined some additional characters that came to our attention, evaluating our findings on specimens not scored for the two kinds of analysis. Random Forest ® analysis was almost always more successful in distinguishing the genomic groups, whether separating all 13 groups or a subset of the 13. The results suggest that it is usually possible to identify the genomic group to which a specimen of perennial Triticeae with solitary spikelets belongs on the basis of its morphology but that doing so will require examination of characters that have not been considered particularly important in the past. Among these are the length of the middle inflorescence internodes, the width of the palea tip, and the morphology of the glumes. Generic descriptions and keys have been posted to the web (see http://herbarium.usu.edu/ triticeae). They include all the genera that we recognize in the tribe, not just those included in the analyses, and will be improved as additional information becomes available.

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Douglasdeweya: A new genus, with a new species and a new combination (Triticeae: Poaceae)

Cited by 32 publications

References 8 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

Phylogenetic relationships of species in Pseudoroegneria (Poaceae: Triticeae) and related genera inferred from nuclear rDNA ITS (internal transcribed spacer) sequences

Morphological identification of genomic genera in the Triticeae

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