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English
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Authors : A.M.C. Barco, T. Hsiang and P.H. Goodwin
Journal / Proceedings: 2nd ETS Confenrence Proceedings
Bibliographic record:
2010 Angers full Papers
Induced Systemic Resistance Against Three Foliar Diseases of Agrostis stolonifera by an Isoparaffin Mixture
Activation of induced systemic resistance (ISR) is associated with gene priming, in which
plant defense genes are expressed more rapidly and strongly after pathogen attack (Conrath et
al., 2006). In monocotyledonous plants, transcripts related to signaling pathways for ethylene
and/or jasmonic acid have been induced or primed after treatment with beneficial fungi, bacteria,
and insects associated with ISR. Recently, a new organic compound, PC1, developed by Petro-
Canada, was found to affect turfgrass diseases in the field (Hsiang et al. 2009). PC1 is a mixture
of food-grade synthetic isoparaffins and food-grade emulsifiers. It is a clear, colorless liquid at
room temperature. Preliminary studies showed that PC1 does not have a direct effect on fungal
pathogens, suggesting that PC1 might be involved in induced resistance.
The purpose of this work was to evaluate the interaction between Agrostis stolonifera
(creeping bentgrass) treated with PC1, and the fungal pathogens Microdochium nivale (causal
agent of pink snow mold), Rhizoctonia solani (causal agent of brown patch) or Sclerotinia
homoeocarpa (causal agent of dollar spot). The effect of PC1 on disease inhibition was assessed,
and expression of ISR-related marker genes in A. stolonifera was assessed after treatment with
PC1 and subsequent inoculation by M. nivale.
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