Plant Pathology (2008) 57, 870-876

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S. Hase, S. Takahashi, S. Takenaka, K. Nakaho, T. Arie, S. Seo, Y. Ohashi and H. Takahashi (2008)
Involvement of jasmonic acid signalling in bacterial wilt disease resistance induced by biocontrol agent Pythium oligandrum in tomato
Plant Pathology 57 (5), 870-876
Abstract: When the biocontrol agent Pythium oligandrum (PO) colonizes the rhizosphere, it suppresses bacterial wilt disease in tomato (Solanum lycopersicum cv. Micro-Tom) caused by Ralstonia solanacearum, and a homogenate of its mycelia exhibits elicitor activity, inducing an ethylene (ET)-dependent defence response in Micro-Tom. Since salicylic acid (SA) and jasmonic acid (JA) play an important role in plant defence responses to pathogens, the involvement of SA- and JA-dependent signal transduction pathways in resistance to R. solanacearum was investigated in tomato roots treated with a mycelial homogenate of PO. Bacterial wilt disease was also suppressed in tomato cv. Moneymaker treated with the PO homogenate. However, the SA-inducible PR-1(P6) gene was not up-regulated in either Micro-Tom or Moneymaker. SA did not accumulate in homogenate-treated roots in comparison with distilled water-treated controls, even 24 h after inoculation. Induced resistance against R. solanacearum was not compromised in SA-non-accumulating NahG transgenic plants treated with the PO homogenate. On the other hand, the expression of the JA-responsive gene for the basic PR-6 protein was induced in both tomato cultivars treated with the PO homogenate. Furthermore, quantitative disease assays showed that the induced resistance against R. solanacearum was compromized in PO homogenate-treated jai1-1 mutant plants defective in JA signalling. These results indicated that the JA-dependent signalling pathway is required for PO-induced resistance against R. solanacearum in tomato.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Kazuhiro Nakaho, Hideki Takahashi, Tsutomu Arie

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
molecular biology - genes

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Ralstonia solanacearum Tomato (Solanum lycopersicum)
Pythium oligandrum (antagonist) Ralstonia solanacearum Tomato (Solanum lycopersicum)