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    Insights into the transcriptomic response of the plant engineering bacterium Ensifer adhaerens OV14 during transformation

    Zuniga-Soto, Evelyn and Fitzpatrick, David A. and Doohan, Fiona M. and Mullins, Ewen (2019) Insights into the transcriptomic response of the plant engineering bacterium Ensifer adhaerens OV14 during transformation. Scientific Reports, 9 (10344). ISSN 2045-2322

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    The ability to engineer plant genomes has been primarily driven by the soil bacterium Agrobacterium tumefaciens but recently the potential of alternative rhizobia such as Rhizobium etli and Ensifer adhaerens OV14, the latter of which supports Ensifer Mediated Transformation (EMT) has been reported. Surprisingly, a knowledge deficit exists in regards to understanding the whole genome processes underway in plant transforming bacteria, irrespective of the species. To begin to address the issue, we undertook a temporal RNAseq-based profiling study of E. adhaerens OV14 in the presence/absence of Arabidopsis thaliana tissues. Following co-cultivation with root tissues, 2333 differentially expressed genes (DEGs) were noted. Meta-analysis of the RNAseq data sets identified a clear shift from plasmid-derived gene expression to chromosomal-based transcription within the early stages of bacterium-plant co-cultivation. During this time, the number of differentially expressed prokaryotic genes increased steadily out to 7 days co-cultivation, a time at which optimum rates of transformation were observed. Gene ontology evaluations indicated a role for both chromosomal and plasmid-based gene families linked specifically with quorum sensing, flagellin production and biofilm formation in the process of EMT. Transcriptional evaluation of vir genes, housed on the pCAMBIA 5105 plasmid in E. adhaerens OV14 confirmed the ability of E. adhaerens OV14 to perceive and activate its transcriptome in response to the presence of 200 µM of acetosyringone. Significantly, this is the first study to characterise the whole transcriptomic response of a plant engineering bacterium in the presence of plant tissues and provides a novel insight into prokaryotic genetic processes that support T-DNA transfer.

    Item Type: Article
    Additional Information: © The Author(s) 2019. Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
    Keywords: transcriptomic response; plant engineering; bacterium; Ensifer adhaerens OV14; transformation;
    Academic Unit: Faculty of Science and Engineering > Biology
    Item ID: 11049
    Identification Number:
    Depositing User: David Fitzpatrick
    Date Deposited: 17 Sep 2019 14:16
    Journal or Publication Title: Scientific Reports
    Publisher: Nature Publishing Group
    Refereed: Yes
    Funders: Science Foundation Ireland (SFI), Teagasc Walsh Fellowship Scheme

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