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Plant Cell Environ

Title:		"Systemic root signalling in a belowground, volatile-mediated tritrophic interaction"
Author(s):		Hiltpold I; Erb M; Robert CA; Turlings TC;
Address:		"FARCE Laboratory, University of Neuchatel, Rue Emile-Argand 11, 2000 Neuchatel, Switzerland"
Journal Title:		Plant Cell Environ
Year:		2011
Volume:		20110516
Issue:		8
Page Number:		1267 - 1275
DOI:		10.1111/j.1365-3040.2011.02327.x
ISSN/ISBN:		1365-3040 (Electronic) 0140-7791 (Linking)
Abstract:		"Plants attacked by leaf herbivores release volatile organic compounds (VOCs) both locally from the wounded site and systemically from non-attacked tissues. These volatiles serve as attractants for predators and parasitoids. This phenomenon is well described for plant leaves, but systemic induction of VOCs in the roots has remained unstudied. We assessed the spatial and temporal activation of the synthesis and release of (E)-beta-caryophyllene (EbetaC) in maize roots upon feeding by larvae of Diabrotica virgifera virgifera, as well as the importance of systemically produced EbetaC for the attraction of the entomopathogenic nematode Heterorhabditis megidis. The production of EbetaC was found to be significantly stronger at the site of attack than in non-attacked tissues. A weak, but significant, increase in transcriptional activity of the EbetaC synthase gene tps23 and a corresponding increase in EbetaC content were observed in the roots above the feeding site and in adjacent roots, demonstrating for the first time that herbivory triggers systemic production of a volatile within root systems. In belowground olfactometers, the nematodes were significantly more attracted towards local feeding sites than systemically induced roots. The possible advantages and disadvantages of systemic volatile signalling in roots are discussed"
Keywords:		Animals Coleoptera/*physiology Host-Parasite Interactions Larva Nematoda/*physiology Plant Proteins/genetics/metabolism Plant Roots/genetics/*metabolism Polycyclic Sesquiterpenes Sesquiterpenes Signal Transduction Volatile Organic Compounds/analysis/metab;
Notes:		"MedlineHiltpold, Ivan Erb, Matthias Robert, Christelle A M Turlings, Ted C J eng Research Support, Non-U.S. Gov't 2011/04/12 Plant Cell Environ. 2011 Aug; 34(8):1267-75. doi: 10.1111/j.1365-3040.2011.02327.x. Epub 2011 May 16"