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J Chem Ecol

Title:		Volatile dose and exposure time impact perception in neighboring plants
Author(s):		Giron-Calva PS; Molina-Torres J; Heil M;
Address:		"Departamento de Ingenieria Genetica, CINVESTAV-Irapuato, Irapuato, Guanajuato, Mexico"
Journal Title:		J Chem Ecol
Year:		2012
Volume:		20120212
Issue:		2
Page Number:		226 - 228
DOI:		10.1007/s10886-012-0072-3
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:		"Volatiles emitted from stressed plants can induce resistance in healthy neighbors. It remains unknown, however, how plants perceive volatiles and convert them into internal signals. We exposed lima bean (Phaseolus lunatus L.) to different concentrations of either of two volatiles, nonanal and methyl salicylate (MeSA), over 6 or 24 h. Plant resistance to the bacterial pathogen, Pseudomonas syringae, was increased significantly after exposure to a headspace with two concentrations of nonanal for 6 h, and the same pattern emerged after an exposure over 24 h. By contrast, exposure to a low concentration of MeSA over 6 h did not significantly reduce bacterial infections, whereas exposure to the same concentration over 24 h significantly enhanced resistance. The dose-response relation that was apparent after 6 h of MeSA exposure disappeared in the 24 h treatment, in which the three tested concentrations caused indistinguishable, high levels of resistance to P. syringae. A low concentration of a potentially resistance-enhancing volatile sufficed to cause resistance to pathogens in the receiver plant only after long exposure time. Plant-plant signaling appears to involve the accumulation of volatiles in the receiver"
Keywords:		"Aldehydes/metabolism/*pharmacology Dose-Response Relationship, Drug Phaseolus/*drug effects/immunology/metabolism/*microbiology Pseudomonas syringae/physiology Salicylates/metabolism/*pharmacology Time Factors Volatile Organic Compounds/*pharmacology;"
Notes:		"MedlineGiron-Calva, P Sarai Molina-Torres, Jorge Heil, Martin eng Research Support, Non-U.S. Gov't 2012/02/14 J Chem Ecol. 2012 Feb; 38(2):226-8. doi: 10.1007/s10886-012-0072-3. Epub 2012 Feb 12"