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J Chem Ecol

Title:		Low concentrations of salicylic acid stimulate insect elicitor responses in Zea mays seedlings
Author(s):		Engelberth J; Viswanathan S; Engelberth MJ;
Address:		"Department Biology, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA. jurgen.engelberth@utsa.edu"
Journal Title:		J Chem Ecol
Year:		2011
Volume:		20110301
Issue:		3
Page Number:		263 - 266
DOI:		10.1007/s10886-011-9926-3
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:		"Salicylic acid (SA) generally is thought to suppress jasmonic acid (JA) related signaling events. However, when we treated the roots of corn seedlings overnight with low physiological concentrations of SA (50 muM), we found a priming effect of this pretreatment on typical insect elicitor (IE)-induced responses in the leaves of these plants. IE-induced JA was more than 2-fold up regulated in SA-pretreated plants. Consequently, IE-induced volatile organic compounds (VOC) release also was significantly increased. In contrast, when corn seedlings were treated with SA overnight and then mechanically damaged, we found no significant differences in JA accumulation. We also found that the application of even lower concentrations of SA (5 muM) had no significant effect on IE-induced responses, while higher concentrations (500 muM) inhibited IE-induced JA accumulation. Likewise, shorter exposure to SA did not affect subsequent JA accumulation induced by IE or mechanical wounding. These results provide evidence for the existence of non-compatible defense priming by signaling molecules that usually are involved in a conflictive defense signaling pathway and suggests common elements in the regulation of priming plant defense responses"
Keywords:		Animals Cyclopentanes/metabolism Insecta/physiology Oxylipins/metabolism Salicylic Acid/*pharmacology Seedlings/drug effects/*physiology Volatile Organic Compounds/metabolism Zea mays/growth & development/*metabolism/physiology;
Notes:		"MedlineEngelberth, Jurgen Viswanathan, Sriram Engelberth, Marie Jeanette eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2011/03/02 J Chem Ecol. 2011 Mar; 37(3):263-6. doi: 10.1007/s10886-011-9926-3. Epub 2011 Mar 1"