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Plant Cell

Title:		Herbivory rapidly activates MAPK signaling in attacked and unattacked leaf regions but not between leaves of Nicotiana attenuata
Author(s):		Wu J; Hettenhausen C; Meldau S; Baldwin IT;
Address:		"Department of Molecular Ecology, Max-Planck-Institute for Chemical Ecology, D-07745 Jena, Germany"
Journal Title:		Plant Cell
Year:		2007
Volume:		20070330
Issue:		3
Page Number:		1096 - 1122
DOI:		10.1105/tpc.106.049353
ISSN/ISBN:		1040-4651 (Print) 1532-298X (Electronic) 1040-4651 (Linking)
Abstract:		"Mitogen-activated protein kinase (MAPK) signaling plays a central role in transducing extracellular stimuli into intracellular responses, but its role in mediating plant responses to herbivore attack remains largely unexplored. When Manduca sexta larvae attack their host plant, Nicotiana attenuata, the plant's wound response is reconfigured at transcriptional, phytohormonal, and defensive levels due to the introduction of oral secretions (OS) into wounds during feeding. We show that OS dramatically amplify wound-induced MAPK activity and that fatty acid-amino acid conjugates in M. sexta OS are the elicitors. Virus-induced gene silencing of salicylic acid-induced protein kinase (SIPK) and wound-induced protein kinase revealed their importance in mediating wound and OS-elicited hormonal responses and transcriptional regulation of defense-related genes. We found that after applying OS to wounds created in one portion of a leaf, SIPK is activated in both wounded and specific unwounded regions of the leaf but not in phylotactically connected adjacent leaves. We propose that M. sexta attack elicits a mobile signal that travels to nonwounded regions of the attacked leaf where it activates MAPK signaling and, thus, downstream responses; subsequently, a different signal is transported by the vascular system to systemic leaves to initiate defense responses without activating MAPKs in systemic leaves"
Keywords:		"Animals Cyclopentanes/metabolism Enzyme Activation Ethylenes/metabolism Gene Expression Regulation, Enzymologic Gene Expression Regulation, Plant Gene Silencing Genes, Plant *MAP Kinase Signaling System Manduca/*physiology Mitogen-Activated Protein Kinase;"
Notes:		"MedlineWu, Jianqiang Hettenhausen, Christian Meldau, Stefan Baldwin, Ian T eng England 2007/04/03 Plant Cell. 2007 Mar; 19(3):1096-122. doi: 10.1105/tpc.106.049353. Epub 2007 Mar 30"