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| DOI: | 10.1093/aob/mcr294 |
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| Web URL(s): | https://academic.oup.com/aob/article/109/2/385/124920/Evolution-and-taxonomic-split-of-the-model-grass
Last checked: 03/02/2017
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Catalán, Pilar;
Müller, Jochen;
Hasterok, Robert;
Jenkins, Glyn;
Mur, Luis A. J.;
Langdon, Tim;
Betekhtin, Alexander;
Siwinska, Dorota;
Pimentel, Manuel;
López-Alvarez, Diana |
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| Author Affiliation: | Catalán and López-Alvarez: Department of Agriculture (Botany), High Polytechnic School of Huesca, University of Zaragoza, Huesca, Spain; Müller: Herbarium Haussknecht, Department of Systematic Botany, University of Jena, Jena, Germany; Hasterok, Betekhtin and Siwinska: Department of Plant Anatomy and Cytology, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland; Jenkins, Mur and Langdon: Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Plas Gogerddan, Wales, UK; Pimentel: Department of Plant and Animal Biology and Ecology, Faculty of Biology, University of Coruña, Spain |
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| Title: | Evolution and taxonomic split of the model grass Brachypodium distachyon |
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| Source: | Annals of Botany. Vol. 109, No. 2, February 2012, p. 385-405. |
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| Publishing Information: | London, Oxford University Press |
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| # of Pages: | 21 |
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| Keywords: | TIC Keywords: Brachypodium distachyon; Comparisons; Differential assessment; Evolution; Fluorescence in situ hybridization; Genetic variability; Hybrids; Laser flow cytometry; Nomenclature; Phenotypic correlation; Phylogenetic analysis; Population genetics; Turfgrass profile
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| Abstract/Contents: | "Background and Aims Brachypodium distachyon is being widely investigated across the world as a model plant for temperate cereals. This annual plant has three cytotypes (2n = 10, 20, 30) that are still regarded as part of a single species. Here, a multidisciplinary study has been conducted on a representative sampling of the three cytotypes to investigate their evolutionary relationships and origins, and to elucidate if they represent separate species. Methods Statistical analyses of 15 selected phenotypic traits were conducted in individuals from 36 lines or populations. Cytogenetic analyses were performed through flow cytometry, fluorescence in situ hybridization (FISH) with genomic (GISH) and multiple DNA sequences as probes, and comparative chromosome painting (CCP). Phylogenetic analyses were based on two plastid (ndhF, trnLF) and five nuclear (ITS, ETS, CAL, DGAT, GI) genes from different Brachypodium lineages, whose divergence times and evolutionary rates were estimated. Key Results The phenotypic analyses detected significant differences between the three cytotypes and demonstrated stability of characters in natural populations. Genome size estimations, GISH, FISH and CCP confirmed that the 2n= 10 and 2n= 20 cytotypes represent two different diploid taxa, whereas the 2n= 30 cytotype represents the allotetraploid derived from them. Phylogenetic analysis demonstrated that the 2n= 20 and 2n= 10 cytotypes emerged from two independent lineages that were, respectively, the maternal and paternal genome donors of the 2n= 30 cytotype. The 2n= 20 lineage was older and mutated significantly faster than the 2n= 10 lineage and all the core perennial Brachypodium species. Conclusions The substantial phenotypic, cytogenetic and molecular differences detected among the three B. distachyon sensu lato cytotypes are indicative of major speciation processes within this complex that allow their taxonomic separation into three distinct species. We have kept the name B. distachyon for the 2n= 10 cytotype and have described two novel species as B. stacei and B. hybridum for, respectively, the 2n= 20 and 2n= 30 cytotypes." |
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| Language: | English |
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| References: | 59 |
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| Note: | Pictures, color
Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Catalán, P., J. Müller, R. Hasterok, G. Jenkins, L. A. J. Mur, T. Langdon, et al. 2012. Evolution and taxonomic split of the model grass Brachypodium distachyon. Ann. Bot. 109(2):p. 385-405. |
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| DOI: 10.1093/aob/mcr294 |
| Web URL(s):
https://academic.oup.com/aob/article/109/2/385/124920/Evolution-and-taxonomic-split-of-the-model-grass
Last checked: 03/02/2017
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2209341a |
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