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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

Site-specific field resistance of grapevine to Plasmopara viticola correlates to altered gene expression and was not modulated by the application of organic amendments

Thuerig, Barbara ; Slaughter, Ana R. ; Marouf, Elaheh ; Held, Matthias ; Mauch-Mani, Brigitte ; Tamm, Lucius

In: European Journal of Plant Pathology, 2011, vol. 129, no. 2, p. 255-265

The influence of site on resistance of grapevine (cv. Chasselas) to Plasmopara viticola was evaluated. Grapevine leaves from three vineyards in the region of Lake Neuchâtel (Switzerland) were tested for their susceptibility to P. viticola in the lab in five successive years (2004–2008), and the expression levels of four selected defence-related genes (Glucanase, Lipoxygenase...

Université de Neuchâtel

Priming by airborne signals boosts direct and indirect resistance in maize

Ton, Jurriaan ; D'Alessandro, Marco ; Jourdie, Violaine ; Jakab, Gabor ; Karlen, Danielle ; Held, Matthias ; Mauch-Mani, Brigitte ; Turlings, Ted C. J.

In: The Plant Journal, 2007, vol. 49, no. 1, p. 16-26

Plants counteract attack by herbivorous insects using a variety of inducible defence mechanisms. The production of toxic proteins and metabolites that instantly affect the herbivore's development are examples of direct induced defence. In addition, plants may release mixtures of volatile organic compounds (VOCs) that indirectly protect the plant by attracting natural enemies of the herbivore....

Université de Neuchâtel

The Role of Indole and Other Shikimic Acid Derived Maize Volatiles in the Attraction of Two Parasitic Wasps

D'Alessandro, Marco ; Held, Matthias ; Triponez, Yann ; Turlings, Ted C. J.

In: Journal of Chemical Ecology, 2006, vol. 32, no. 2, p. 2733-2748

After herbivore attack, plants release a plethora of different volatile organic compounds (VOCs), which results in odor blends that are attractive to predators and parasitoids of these herbivores. VOCs in the odor blends emitted by maize plants (Zea mays) infested by lepidopteran larvae are well characterized. They are derived from at least three different biochemical pathways, but the...

Université de Neuchâtel

A comparison of naïve and conditioned responses of three generalist endoparasitoids of lepidopteran larvae to host-induced plant odours

Tamò, Cristina ; Ricard, Ingrid ; Held, Matthias ; Davison, A. C. ; Turlings, Ted C. J.

In: Animal Biology, 2006, vol. 56, p. 205-220

Many parasitic wasps that exploit herbivores as their hosts make use of herbivoreinduced plant odours to locate their victims and these wasps often exhibit an ability to learn to associate specific plant-produced odours with the presence of hosts. This associative learning is expected to allow generalist parasitoids to focus on cues that are most reliably associated with current host presence,...

Université de Neuchâtel

Evaluating the Induced-Odour Emission of a Bt Maize and its Attractiveness to Parasitic Wasps

Turlings, Ted C. J. ; Jeanbourquin, Philippe M. ; Held, Matthias ; Degen, Thomas

In: Transgenic Research, 2005, vol. 14, p. 807-816

The current discussion on the safety of transgenic crops includes their effects on beneficial insects, such as parasitoids and predators of pest insects. One important plant trait to consider in this context is the emission of volatiles in response to herbivory. Natural enemies use the odours that result from these emissions as cues to locate their herbivorous prey and any significant change in...

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...