Université de Fribourg

Induced jasmonate signaling leads to contrasting effects on root damage and herbivore performance

Lu, Jing ; Robert, Christelle Aurélie Maud ; Riemann, Michael ; Cosme, Marco ; Mène-Saffrané, Laurent ; Massana, Josep ; Stout, Michael Joseph ; Lou, Yonggen ; Gershenzon, Jonathan ; Erb, Matthias

In: Plant Physiology, 2015, vol. 167, no. 3, p. 1100–1116

Induced defenses play a key role in plant resistance against leaf feeders. However, very little is known about the signals that are involved in defending plants against root feeders and how they are influenced by abiotic factors. We investigated these aspects for the interaction between rice (Oryza sativa) and two root-feeding insects: the generalist cucumber beetle (Diabrotica balteata) and the...

Université de Neuchâtel

Attractiveness of Constitutive and Herbivore-Induced Sesquiterpene Blends of Maize to the Parasitic Wasp Cotesia marginiventris (Cresson)

Fontana, Anna ; Held, Matthias ; Fantaye, Chalie A. ; Turlings, Ted C. J. ; Degenhardt, Jörg ; Gershenzon, Jonathan

In: Journal of Chemical Ecology, 2011, vol. 37, no. 6, p. 582-591

Plant volatile compounds induced by herbivore attack have been demonstrated to provide a signal to herbivore enemies such as parasitic wasps that use these volatiles to locate their hosts. However, in addition to herbivore-induced volatiles, plants often release volatiles constitutively. We assessed the interaction between herbivore-induced and constitutively released volatiles of maize in the...

Université de Neuchâtel

Restoring a maize root signal that attracts insect-killing nematodes to control a major pest

Degenhardt, Jörg ; Hiltpold, Ivan ; Köllner, Tobias G. ; Frey, Monika ; Gierl, Alfons ; Gershenzon, Jonathan ; Hibbard, Bruce E. ; Ellersieck, Mark R. ; Turlings, Ted C. J.

In: Proceedings of the National Academy of Sciences, 2009, vol. 106, no. 32, p. 13213-13218

When attacked by herbivorous insects, plants emit volatile compounds that attract natural enemies of the insects. It has been proposed that these volatile signals can be manipulated to improve crop protection. Here, we demonstrate the full potential of this strategy by restoring the emission of a specific belowground signal emitted by insect-damaged maize roots. The western corn rootworm induces...

Université de Neuchâtel

The products of a single maize sesquiterpene synthase form a volatile defense signal that attracts natural enemies of maize herbivores

Schnee, Christiane ; Köllner, Tobias G. ; Held, Matthias ; Turlings, Ted C. J. ; Gershenzon, Jonathan ; Degenhardt, Jörg

In: Proceedings of the National Academy of Sciences of the United Sciences of America (PNAS), 2006, vol. 103, p. 1129-1134

Plants can defend themselves against herbivores by attracting natural enemies of the herbivores. The cues for attraction are often complex mixtures of herbivore-induced plant volatiles, making it difficult to demonstrate the role of specific compounds. After herbivory by lepidopteran larvae, maize releases a mixture of volatiles that is highly attractive to females of various parasitic wasp...

Université de Neuchâtel

Recruitment of entomopathogenic nematodes by insect-damaged maize roots

Rasmann, Sergio ; Köllner, Tobias G. ; Degenhardt, Jörg ; Hiltpold, Ivan ; Toepfer, Stefan ; Kuhlmann, Ulrich ; Gershenzon, Jonathan ; Turlings, Ted C. J.

In: Nature, 2005, vol. 434, p. 732-737

Plants under attack by arthropod herbivores often emit volatile compounds from their leaves that attract natural enemies of the herbivores. Here we report the first identification of an insect-induced belowground plant signal, (E)-β-caryophyllene, which strongly attracts an entomopathogenic nematode. Maize roots release this sesquiterpene in response to feeding by larvae of the beetle...