Université de Neuchâtel

The role of abscisic acid and water stress in root herbivore-induced leaf resistance

Erb, Matthias ; Köllner, Tobias G. ; Degenhardt, Jörg ; Zwahlen, Claudia ; Hibbard, Bruce E. ; Turlings, Ted C. J.

In: New Phytologist, 2011, vol. 189, no. 1, p. 308-320

Herbivore-induced systemic resistance occurs in many plants and is commonly assumed to be adaptive. The mechanisms triggered by leaf-herbivores that lead to systemic resistance are largely understood, but it remains unknown how and why root herbivory also increases resistance in leaves. To resolve this, we investigated the mechanism by which the root herbivore Diabrotica...

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

The underestimated role of roots in defense against leaf attackers

Erb, Matthias ; Lenk, Claudia ; Degenhardt, Jörg ; Turlings, Ted C. J.

In: Trends in Plant Science, 2009, vol. 14, no. 12, p. 653-659

Plants have evolved intricate strategies to withstand attacks by herbivores and pathogens. Although it is known that plants change their primary and secondary metabolism in leaves to resist and tolerate aboveground attack, there is little awareness of the role of roots in these processes. This is surprising given that plant roots are responsible for the synthesis of plant toxins, play an active...

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...

Université de Neuchâtel

Costs of induced volatile production in maize

Hoballah, Maria Elena ; Köllner, Tobias G. ; Degenhardt, Jörg ; Turlings, Ted C. J.

In: Oikos, 2004, vol. 105, p. 168-180

Herbivore-induced plant volatiles have been shown to serve as indirect defence signals that attract natural enemies of herbivores. Parasitoids and predators exploit these plant-provided cues to locate their victims and several herbivores are repelled by the volatiles. Recently, benefits, in terms of plant fitness, from the action of the parasitoids were shown for a few systems. However, the cost...