Transcriptome assembly and analyses of gene expression in diploid wheat Triticum monococcum Public Deposited


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  • Background: Triticum monococcum (2n) is a close ancestor of T. urartu, the A-genome progenitor of cultivated hexaploid wheat, and is therefore a useful model for the study of components regulating photomorphogenesis in diploid wheat. In order to develop genetic and genomic resources for such a study, we constructed genome-wide transcriptomes of two Triticum monococcum subspecies, the wild winter wheat T. monococcum ssp. aegilopoides (accession G3116) and the domesticated spring wheat T. monococcum ssp. monococcum (accession DV92) by generating de novo assemblies of RNA-Seq data derived from both etiolated and green seedlings. Principal Findings: The de novo transcriptome assemblies of DV92 and G3116 represent 120,911 and 117,969 transcripts, respectively. We successfully mapped ~90% of these transcripts from each accession to barley and ~95% of the transcripts to T. urartu genomes. However, only ~77% transcripts mapped to the annotated barley genes and ~85% transcripts mapped to the annotated T. urartu genes. Differential gene expression analyses revealed 22% more light up-regulated and 35% more light down-regulated transcripts in the G3116 transcriptome compared to DV92. The DV92 and G3116 mRNA sequence reads aligned against the reference barley genome led to the identification of ~500,000 single nucleotide polymorphism (SNP) and ~22,000 simple sequence repeat (SSR) sites. Conclusions: De novo transcriptome assemblies of two accessions of the diploid wheat T. monococcum provide new empirical transcriptome references for improving Triticeae genome annotations, and insights into transcriptional programming during photomorphogenesis. The SNP and SSR sites identified in our analysis provide additional resources for the development of molecular markers. For more details on the Triticum monococcum transcriptome project data, visit:
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  • Fox, Samuel E.; Geniza, Matthew; Hanumappa, Mamatha; Naithani, Sushma; Sullivan, Chris; Preece, Justin; Tiwari, Vijay K.; Elser, Justin; Leonard, Jeffery M.; Sage, Abagail; Gresham, Cathy; Kerhornou, Arnaud; Bolser, Dan; McCarthy, Fiona; Kersey, Paul; Lazo, Gerard R.; Jaiswal, Pankaj (2014): Transcriptome assembly and analyses of gene expression in diploid wheat Triticum monococcum. Oregon State University Libraries. Dataset.
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  • This work was supported by the laboratory startup funds provided by the Department of Botany and Plant Pathology and College of Agricultural Sciences at Oregon State University to PJ and SN. Research funds were also provided by the Department of Crop and Soil Science, Agricultural Sciences at Oregon State University to JL. MG received Anita S. Summers travel award from the Department of Botany and Plant Pathology at Oregon State University and to present this work at the Plant and Animal Genome Conference. Contributions from International collaborators, PK, DB and AK were supported by the ‘transPLANT’ project funded by the European Commission within its 7th Framework Programme, under the thematic area ‘Infrastructures’ (contract #283496) and the Triticeae Genomics for Sustainable Agriculture project (BBSRC: #BB/J003743/1). The funders had no role in the study design, data analysis, or preparation of the manuscript.
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