Université de Neuchâtel

Variability in herbivore-induced odour emissions among maize cultivars and their wild ancestors (teosinte)

Gouinguené, Sandrine ; Degen, Thomas ; Turlings, Ted C. J.

In: Chemoecology, 2001, vol. 1, p. 9-16

Maize plants respond to caterpillar feeding with the release of relatively large amounts of specific volatiles, which are known to serve as cues for parasitoids to locate their host. Little is known about the genetic variability in such herbivore-induced plant signals and about how the emissions in cultivated plants compare to those of their wild relatives. For this reason we compared the total...

Université de Neuchâtel

Induction of Volatile Emissions in Maize by Different Larval Instars of Spodoptera littoralis

Gouinguené, Sandrine ; Alborn, Hans ; Turlings, Ted C. J.

In: Journal of Chemical Ecology, 2003, vol. 29, p. 145 - 162

Maize plants under attack by caterpillars emit a specific blend of volatiles that is highly attractive to parasitic wasps. The release of these signals is induced by elicitors in the caterpillar regurgitant. Studies suggest that plants respond differently to different herbivore species and even to different herbivore stages, thus providing parasitoids and predators with specific signals. We...

Université de Neuchâtel

Antennal Electrophysiological Responses of Three Parasitic Wasps to Caterpillar-Induced Volatiles from Maize (Zea mays mays), Cotton (Gossypium herbaceum), and Cowpea (Vigna unguiculata)

Gouinguené, Sandrine ; Pickett, John A. ; Wadhams, Lester J. ; Birkett, Michael A. ; Turlings, Ted C. J.

In: Journal of Chemical Ecology, 2005, vol. 31, no. 5, p. 1023-1038

Many parasitic wasps are attracted to volatiles that are released by plants when attacked by potential hosts. The attractiveness of these semiochemicals from damaged plants has been demonstrated in many tritrophic systems, but the physiological mechanisms underlying the insect responses are poorly understood. We recorded the antennal perception by three parasitoids (Cotesia marginiventris,...

Université de Neuchâtel

Specificity and variability of induced volatile signalling in maize plants

Gouinguené, Sandrine ; Rahier, Martine (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2001 ; 1536.

Many parasitoids that attack phytophageous insects make use of plant odours to locate the habitat of their host. In maize large amount of these odours are specifically emitted by a plant after it has been damaged by a herbivore, but not after mechanical damage. The odour emissions occur systematically throughout the plant. Factors in the oral secretion of the herbivores are the main elicitors of...