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Ancient horizontal gene transfer from Rhizobium rhizogenes to European genera of the Figwort family (Scrophulariaceae)

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Abstract

Rhizobium rhizogenes exploits horizontal gene transfer as part of its mechanism of pathogenesis. In this respect, genetic material, transfer DNA (T-DNA) from the bacterium, is transferred transiently to the host plant genome. However, plant species within Nicotiana, Linaria and Ipomea genera contain genomic traces of ancient bacterial T-DNA. To determine if ancient bacterial T-DNA is present in uncultivated plants of European genera within Scrophulariaceae, seeds of Linaria, Antirrhinum, Digitalis, and Veronica were analysed for the presence of one of the root oncogenic loci genes; rolC of R. rhizogenes. This study discloses remnants of ancient rolC haplotypes in several species of Linaria, Antirrhinum, Digitalis and Veronica. The distribution of plant species harbouring rolC sequences within each genus was not uniform. In total, 7 of the 16 investigated species were found to be positive for at least one of the rolC haplotypes, where 6 of these are new additions to the group of naturally transformed plants. Sequence alignment showed high interspecies homology of rolC. Five unique rolC haplotypes (rolCa-rolCe) were found in several plant species. The most abundant, rolCa, was identified in all the plant species holding ancient bacterial DNA. Transcripts of rolC were not detected in leaves, which indicates that rolC may not have a function in leaves under non-stress conditions. This study adds Antirrhinum, Digitalis and Veronica to the list of plant genera within Scrophulariaceae which have been subjected to ancient transformation events via horizontal gene transfer from bacteria to plants.

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Data availability

Sequence data that support the findings of this study have been deposited in GenBank with the accession codes LvRolCa (MN097818), LvRolCb (MN097819), LvRolCc (MN097820), LvRolCd (MN097821), LpRolCa (MN097822), AmRolCa (MN097823), DpRolCa (MN097824), DpRolCb (MN097828), DpRolCd (MN097833), DpRolCe (MN097834), VaRolCa (MN097825), VaRolCb (MN097829), VbRolCa (MN097826), VbRolCb (MN097830), VcRolCa (MN097827), VcRolCb (MN097831), VcRolCc (MN097832) and VcRolCe (MN097835).

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Acknowledgements

This work was supported by the Danish Agency for Science and Higher Education as part of the innovation consortium “Innovative Plants”. Botanischer Garten der Universität Hamburg in Germany, Royal Botanic Gardens (KEW) in England and the University Gardens, Frederiksberg Campus and the seed collection, Taastrup Campus, Faculty of Science, University of Copenhagen in Denmark are acknowledged for providing plant material. Martin Himmelboe and Mikkel Kok Jensen are acknowledged for design of primers. We thank Jesper Cairo Westergaard for proofreading the article.

Funding

This study was funded by the Danish Agency for Science and Higher Education as part of the innovation consortium “Innovative Plants”.

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SSS, JPM, RM and JNH conceived and designed the study. SSS and JPM planned and performed experiments with assistance of JNH and HL. SSS and JNH wrote the manuscript. All authors critically revised the manuscript, read and approved the final manuscript.

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Correspondence to Josefine Nymark Hegelund.

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Stavnstrup, S.S., Molina, J.P., Lütken, H. et al. Ancient horizontal gene transfer from Rhizobium rhizogenes to European genera of the Figwort family (Scrophulariaceae). Euphytica 216, 186 (2020). https://doi.org/10.1007/s10681-020-02722-7

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