Document Detail

Role of pathogen-induced volatiles in the Nicotiana tabacum-Golovinomyces cichoracearum interaction.
MedLine Citation:
PMID:  22305063     Owner:  NLM     Status:  In-Data-Review    
Plant injuries activate signal transduction cascades mediated by the plant hormones, which lead to enhanced expression of defence related genes and/or to changes in the emission of volatile organic compounds that can act as semiochemicals. In this research we demostrated that infection with the biotrophic pathogen Golovinomyces cichoracearum (DC.) V.P. Heluta (ex Erysiphe cichoracearum DC.), the causal agent of powdery mildew, led in the susceptible host Nicotiana tabacum L. cv Havana 425 to an increased emission of volatile compounds including Methyl-jasmonate (MeJA), (E)-2-hexenal and (E)-β-ocimene. Furthermore we investigated the role of these volatiles in the plant-pathogen interaction. Exogenous application of MeJA induced in tobacco an increase in the transcripts level of the defence related genes lipoxygenase, allene oxide cyclase and defensin and a decrease in the severity of the infection. Qualitative and quantitative differences in volatile compounds emission were showed also in MeJA-treated plants, where the emission of (E)-β-ocimene was significantly increased instead (E)-2-hexenal was not detected. Application of (E)-2-hexenal reduced the severity of powdery mildew while application of (E)-β-ocimene did not. Since (E)-2-hexenal did not activate in tobacco the accumulation of the above reported genes transcripts and the plant cell death, the reduction of the infection severity could be attributable to its inhibitory activity on the fungal germ tube growth. Our data highlight the contributions of natural substances that can act, directly or indirectly, against phytopathogens. In the global context of sustainability, food safety and environmental protection, such semiochemicals represent an alternative and promising approach to integrated pest management.
Mara Quaglia; Mario Fabrizi; Antonio Zazzerini; Claudia Zadra
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Publication Detail:
Type:  Journal Article     Date:  2011-11-20
Journal Detail:
Title:  Plant physiology and biochemistry : PPB / Société française de physiologie végétale     Volume:  52     ISSN:  1873-2690     ISO Abbreviation:  Plant Physiol. Biochem.     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-02-06     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882449     Medline TA:  Plant Physiol Biochem     Country:  France    
Other Details:
Languages:  eng     Pagination:  9-20     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Masson SAS. All rights reserved.
Department of Agricultural and Environmental Sciences, University of Perugia, Borgo XX Giugno 74, I-06121 Perugia, Italy.
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