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Molecules 2013, 18(10), 12877-12895; doi:10.3390/molecules181012877

Elicitation of Induced Resistance against Pectobacterium carotovorum and Pseudomonas syringae by Specific Individual Compounds Derived from Native Korean Plant Species

1
Molecular Phytobacteriology Laboratory, Superbacteria Research Center, KRIBB, Daejeon 305-806, Korea
2
Biosystems and Bioengineering Program, School of Science, University of Science and Technology, Daejeon 305-333, Korea
3
Korea Research Institute of Chemical Technology, P.O. Bos 107, 141 Gajeong-ro, Yuseong, Daejeon 305-600, Korea
4
Graduate School of New Drug Discovery and Development, Chungnam National University, Daejeon 305-764, Korea
*
Author to whom correspondence should be addressed.
Received: 27 August 2013 / Revised: 30 September 2013 / Accepted: 9 October 2013 / Published: 16 October 2013
(This article belongs to the Section Natural Products)
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Abstract

Plants have developed general and specific defense mechanisms for protection against various enemies. Among the general defenses, induced resistance has distinct characteristics, such as broad-spectrum resistance and long-lasting effectiveness. This study evaluated over 500 specific chemical compounds derived from native Korean plant species to determine whether they triggered induced resistance against Pectobacterium carotovorum supsp. carotovorum (Pcc) in tobacco (Nicotiana tabacum) and Pseudomonas syringae pv. tomato (Pst) in Arabidopsis thaliana. To select target compound(s) with direct and indirect (volatile) effects, a new Petri-dish-based in vitro disease assay system with four compartments was developed. The screening assay showed that capsaicin, fisetin hydrate, jaceosidin, and farnesiferol A reduced the disease severity significantly in tobacco. Of these four compounds, capsaicin and jaceosidin induced resistance against Pcc and Pst, which depended on both salicylic acid (SA) and jasmonic acid (JA) signaling, using Arabidopsis transgenic and mutant lines, including npr1 and NahG for SA signaling and jar1 for JA signaling. The upregulation of the PR2 and PDF1.2 genes after Pst challenge with capsaicin pre-treatment indicated that SA and JA signaling were primed. These results demonstrate that capsaicin and jaceosidin can be effective triggers of strong induced resistance against both necrotrophic and biotrophic plant pathogens. View Full-Text
Keywords: capsaicin; induced resistance; jaceosidin; plant extracts; systemic acquired resistance capsaicin; induced resistance; jaceosidin; plant extracts; systemic acquired resistance
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Song, G.C.; Ryu, S.Y.; Kim, Y.S.; Lee, J.Y.; Choi, J.S.; Ryu, C.-M. Elicitation of Induced Resistance against Pectobacterium carotovorum and Pseudomonas syringae by Specific Individual Compounds Derived from Native Korean Plant Species. Molecules 2013, 18, 12877-12895.

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