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Induced ligno-suberin vascular coating and tyramine-derived hydroxycinnamic acid amides restrict Ralstonia solanacearum colonization in resistant tomato.

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Affiliations

  • 1. Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB, 08193, Bellaterra, Spain.
      Authors
    • Kashyap A 1
    • Jiménez-Jiménez ÁL 1
    • Zhang W 1
    • Capellades M 1
    • Valls M 1
    • Coll NS 1
    (6 authors)
  • 2. Institute of Material Science of Barcelona (ICMAB), CSIC, Campus UAB, 08193, Bellaterra, Spain.
      Authors
    • Srinivasan S 2
    • Laromaine A 2
    (2 authors)
  • 3. Laboratori del Suro, Biology Department, University of Girona, Campus Montilivi, 17003, Girona, Spain.
      Authors
    • Serra O 3
    • Figueras M 3
    (2 authors)
  • 4. Institute of Natural Resources and Agrobiology of Seville (IRNAS), CSIC, 41012, Seville, Spain.
      Authors
    • Rencoret J 4
    • Gutiérrez A 4
    (2 authors)

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The New Phytologist, 13 Feb 2022, 234(4):1411-1429
https://doi.org/10.1111/nph.17982 PMID: 35152435 

This article has been corrected. See New Phytol. 2022 Sep;235(6):2496. This article is based on a previously available preprint.

Abstract 

Tomato varieties resistant to the bacterial wilt pathogen Ralstonia solanacearum have the ability to restrict bacterial movement in the plant. Inducible vascular cell wall reinforcements seem to play a key role in confining R. solanacearum into the xylem vasculature of resistant tomato. However, the type of compounds involved in such vascular physico-chemical barriers remain understudied, while being a key component of resistance. Here we use a combination of histological and live-imaging techniques, together with spectroscopy and gene expression analysis to understand the nature of R. solanacearum-induced formation of vascular coatings in resistant tomato. We describe that resistant tomato specifically responds to infection by assembling a vascular structural barrier formed by a ligno-suberin coating and tyramine-derived hydroxycinnamic acid amides. Further, we show that overexpressing genes of the ligno-suberin pathway in a commercial susceptible variety of tomato restricts R. solanacearum movement inside the plant and slows disease progression, enhancing resistance to the pathogen. We propose that the induced barrier in resistant plants does not only restrict the movement of the pathogen, but may also prevent cell wall degradation by the pathogen and confer anti-microbial properties, effectively contributing to resistance.

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Read article at publisher's site: https://doi.org/10.1111/nph.17982

Read article for free, from open access legal sources, via Unpaywall: https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/nph.17982Unpaywall

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Funding 

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Fundación General CSIC (1)

Indian Council of Agricultural Research

    Ministerio de Ciencia e Innovación (3)