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Nuclear and chloroplast DNA phylogeny reveals complex evolutionary history of Elymus pendulinus.
Yan C, Hu Q, Sun G
(2014) Genome 57: 97-109
MeSH Terms: Base Sequence, Biological Evolution, Cell Nucleus, Chloroplasts, DNA, Chloroplast, Elymus, Evolution, Molecular, Genome, Chloroplast, Genome, Plant, Hordeum, Polyploidy, RNA Polymerase II, Ribosomal Proteins, Sequence Analysis, DNA, Serine Endopeptidases
Show Abstract · Added May 15, 2018
Evidence accumulated over the last decade has shown that allopolyploid genomes may undergo complex reticulate evolution. In this study, 13 accessions of tetraploid Elymus pendulinus were analyzed using two low-copy nuclear genes (RPB2 and PepC) and two regions of chloroplast genome (Rps16 and trnD-trnT). Previous studies suggested that Pseudoroegneria (St) and an unknown diploid (Y) were genome donors to E. pendulinus, and that Pseudoroegneria was the maternal donor. Our results revealed an extreme reticulate pattern, with at least four distinct gene lineages coexisting within this species that might be acquired through a possible combination of allotetraploidization and introgression from both within and outside the tribe Hordeeae. Chloroplast DNA data identified two potential maternal genome donors (Pseudoroegneria and an unknown species outside Hordeeae) to E. pendulinus. Nuclear gene data indicated that both Pseudoroegneria and an unknown Y diploid have contributed to the nuclear genome of E. pendulinus, in agreement with cytogenetic data. However, unexpected contributions from Hordeum and unknown aliens from within or outside Hordeeae to E. pendulinus without genome duplication were observed. Elymus pendulinus provides a remarkable instance of the previously unsuspected chimerical nature of some plant genomes and the resulting phylogenetic complexity produced by multiple historical reticulation events.
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Barley stripe mosaic virus: structure and relationship to the tobamoviruses.
Kendall A, Williams D, Bian W, Stewart PL, Stubbs G
(2013) Virology 443: 265-70
MeSH Terms: Capsid Proteins, Cryoelectron Microscopy, Evolution, Molecular, Hordeum, RNA Viruses, Tobacco, Tobacco Mosaic Virus, X-Ray Diffraction
Show Abstract · Added February 15, 2016
Barley stripe mosaic virus (BSMV) is the type member of the genus Hordeivirus, rigid, rod-shaped viruses in the family Virgaviridae. We have used fiber diffraction and cryo-electron microscopy to determine the helical symmetry of BSMV to be 23.2 subunits per turn of the viral helix, and to obtain a low-resolution model of the virus by helical reconstruction methods. Features in the model support a structural relationship between the coat proteins of the hordeiviruses and the tobamoviruses.
Copyright © 2013 Elsevier Inc. All rights reserved.
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Multiple origins of allopolyploid wheatgrass Elymus caninus revealed by RPB2, PepC and TrnD/T genes.
Yan C, Sun G
(2012) Mol Phylogenet Evol 64: 441-51
MeSH Terms: DNA, Plant, Elymus, Gene Duplication, Genetic Variation, Genome, Plant, Hordeum, Phosphoenolpyruvate Carboxylase, Phylogeny, Polyploidy, RNA Polymerase II, Sequence Analysis, DNA
Show Abstract · Added May 15, 2018
We examined evolutionary mechanisms in the tetraploid Elymus caninus by comparing the phylogenetic relationships of 21 accessions suggested by sequence data from two single copy nuclear genes, the largest subunit of RNA polymerase II (RPB2) and phosphoenolpyruvate carboxylase (pepC), and one non-coding chloroplast region, TrnD/T. Elymus caninus is known combining two different genomes, an St genome and an H genome. Data from two single copy nuclear genes showed that there are two versions of the St genome in the species, St1 and St2. Most accessions combined one of these versions with an H genome version but two accessions had both versions of the St sequence for RPB2. This suggests that the RPB2gene may have been duplicated without chromosome doubling, possibly induced by transposable element. Our data also indicate that the H genome sequences in E. caninus have multiple origins, and a close phylogenetic relationship between Hordeum bogdanii and H sequences in some accessions of E. caninus. Thus, it is more likely that H. bogdanii is one of the major donors of the H copy in E. caninus. The maternal origin of E. caninus is the St genome species. There was no correlation between the geographic origin of the accessions and their sequence divergence.
Copyright © 2012 Elsevier Inc. All rights reserved.
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Nucleotide sequence of a rice genomic clone that encodes a class I endochitinase.
Huang JK, Wen L, Swegle M, Tran HC, Thin TH, Naylor HM, Muthukrishnan S, Reeck GR
(1991) Plant Mol Biol 16: 479-80
MeSH Terms: Amino Acid Sequence, Base Sequence, Chitinases, Cloning, Molecular, DNA Probes, Hordeum, Molecular Sequence Data, Oryza, Sequence Homology, Nucleic Acid
Added April 17, 2019
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