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Volatile organic compounds (VOC) were extracted and identified from plant growth-promoting fungi (PGPF),  Phoma  sp.,  Cladosporium  sp. and  Ampelomyces  sp., using gas chromatography–mass spectrometry (GC-MS). Among the three VOC extracted, two VOC blends (emitted from  Ampelomyces  sp. and  Cladosporium  sp.) significantly reduced disease severity in  Arabidopsis  plants against  Pseudomonas syringae  pv.  tomato  DC3000 ( Pst ). Subsequently,  m -cresol and methyl benzoate (MeBA) were identified as major active volatile compounds from  Ampelomyces sp.  and  Cladosporium sp ., respectively, and found to elicit induced systemic resistance (ISR) against the pathogen. Molecular signaling for disease suppression by the VOC were investigated by treating different mutants and transgenic Arabidopsis plants impaired in salicylic acid (SA) or Jasmonic acid (JA)/ethylene (ET) signaling pathways with  m -cresol and MeBA followed by challenge inoculation with  Pst . Results show that the level of protection was significantly lower when JA/ET-impaired mutants were treated with MeBA, and in SA-, and JA/ET-disrupted mutants after  m -cresol treatment, indicating the involvement of these signal transduction pathways in the ISR primed by the volatiles. Analysis of defense-related genes by real-time qRT-PCR showed that both the SA-and JA-signaling pathways combine in the  m -cresol signaling of ISR, whereas MeBA is mainly involved in the JA-signaling pathway with partial recruitment of SA-signals. The ET-signaling pathway was not employed in ISR by the volatiles. Therefore, this study identified two novel volatile components capable of eliciting ISR that may be promising candidates in biological control strategy to protect plants from diseases.

Systemic Resistance Induced by Volatile Organic Compounds Emitted by Plant Growth-Promoting Fungi in Arabidopsis thaliana