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PLoS One

Title:		Induced resistance by a long-chain bacterial volatile: elicitation of plant systemic defense by a C13 volatile produced by Paenibacillus polymyxa
Author(s):		Lee B; Farag MA; Park HB; Kloepper JW; Lee SH; Ryu CM;
Address:		"Molecular Phytobacteriology Laboratory, Systems and Synthetic Biology Research Center, KRIBB, Daejeon, South Korea"
Journal Title:		PLoS One
Year:		2012
Volume:		20121128
Issue:		11
Page Number:		e48744 -
DOI:		10.1371/journal.pone.0048744
ISSN/ISBN:		1932-6203 (Electronic) 1932-6203 (Linking)
Abstract:		"BACKGROUND: Some strains of plant growth-promoting rhizobacteria (PGPR) elicit induced systemic resistance (ISR) by emission of volatile organic compounds (VOCs) including short chain alcohols, acetoin, and 2,3-butanediol. The objective of this study was to evaluate whether species-specific VOCs from PGPR strain Paenibacillus polymyxa E681 can promote growth and induce resistance in Arabidopsis. METHODOLOGY/PRINCIPAL FINDINGS: The efficacy of induction was strain-specific, with stronger protection against Pseudomonas syringae pv. maculicola ES4326 in plants exposed to VOCs from P. polymyxa E681 versus Arabidopsis plants exposed to VOCs from a reference strain Bacillus subtilis GB03, which was previously shown to elicit ISR and plant growth promotion. VOC emissions released from E681 primed transcriptional expression of the salicylic acid, jasmonic acid, and ethylene signaling marker genes PR1, ChiB, and VSP2, respectively. In addition, strain E681 produced more than thirty low molecular-weight VOCs, of which tridecane was only produced by E681 and not found in GB03 or IN937a volatile blends. These strain-specific VOCs induced PR1 and VSP2 genes. CONCLUSIONS/SIGNIFICANCE: These results provide new insight into the existence of a long chain VOC signaling molecule produced by P. polymyxa that can serve as a bacterial trigger of induced systemic resistance in planta"
Keywords:		"Arabidopsis/*drug effects/*growth & development/microbiology Disease Resistance/*drug effects/genetics/immunology Gene Expression Profiling Gene Expression Regulation, Plant Paenibacillus/*metabolism Plant Diseases/genetics/immunology/microbiology Pseudom;"
Notes:		"MedlineLee, Boyoung Farag, Mohamed A Park, Hyo Bee Kloepper, Joseph W Lee, Soo Hyun Ryu, Choong-Min eng Research Support, Non-U.S. Gov't 2012/12/05 PLoS One. 2012; 7(11):e48744. doi: 10.1371/journal.pone.0048744. Epub 2012 Nov 28"