期刊
NEW PHYTOLOGIST
卷 234, 期 4, 页码 1411-1429出版社
WILEY
DOI: 10.1111/nph.17982
关键词
bacterial wilt; feruloyltyramine; HCAAs; lignin; Ralstonia solanacearum; suberin; tomato; vascular coating
资金
- Severo Ochoa Programme for Centres of Excellence in RD [MCIN/AEI/10.13039/501100011033, MCIN/AEI/PID2019-110330GB-C21, MCIN/AEI/PID2020-118968RB-I00, SEV-2015-0533, CEX2019-000917, CEX2019-000902-S, MCIN/AEI/ 10.13039/501100011033]
- Spanish National Research Council (CISC) [pie-201620E081]
- Generalitat de Catalunya [2017SGR765]
- Netaji Subhas - Indian Council of Agricultural Research International Fellowship
- DOC-FAM, European Union [754397]
- CERCA Program/Generalitat de Catalunya
Tomato varieties resistant to the bacterial wilt pathogen can restrict bacterial movement by forming vascular coatings composed of ligno-suberin and tyramine-derived hydroxycinnamic acid amides. Overexpressing genes of the ligno-suberin pathway in susceptible tomato varieties enhances resistance to the pathogen.
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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