« Previous AbstractA protein with similarity to the human retinoblastoma binding protein 2 acts specifically as a repressor for genes regulated by the b mating type locus in Ustilago maydis    Next AbstractQuantification of plant volatiles »

Plant Physiol Biochem

Title:		Role of pathogen-induced volatiles in the Nicotiana tabacum-Golovinomyces cichoracearum interaction
Author(s):		Quaglia M; Fabrizi M; Zazzerini A; Zadra C;
Address:		"Department of Agricultural and Environmental Sciences, University of Perugia, Borgo XX Giugno 74, I-06121 Perugia, Italy. mara.quaglia@unipg.it"
Journal Title:		Plant Physiol Biochem
Year:		2012
Volume:		20111120
Issue:
Page Number:		9 - 20
DOI:		10.1016/j.plaphy.2011.11.006
ISSN/ISBN:		1873-2690 (Electronic) 0981-9428 (Linking)
Abstract:		"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)-beta-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)-beta-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)-beta-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"
Keywords:		"Acetates/metabolism/*pharmacology Acyclic Monoterpenes Aldehydes/metabolism Alkenes/metabolism Anti-Infective Agents/metabolism Ascomycota/*physiology Cyclopentanes/metabolism/*pharmacology Defensins/genetics/metabolism Gene Expression Regulation, Plant/d;"
Notes:		"MedlineQuaglia, Mara Fabrizi, Mario Zazzerini, Antonio Zadra, Claudia eng Research Support, Non-U.S. Gov't France 2012/02/07 Plant Physiol Biochem. 2012 Mar; 52:9-20. doi: 10.1016/j.plaphy.2011.11.006. Epub 2011 Nov 20"