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Université de Neuchâtel

Minor effects of two elicitors of insect and pathogen resistance on volatile emissions and parasitism of Spodoptera frugiperda in Mexican maize fields

von Mérey, Georg ; Veyrat, Nathalie ; de Lange, Elvira S. ; Degen, Thomas ; Mahuku, George ; Lopez Valdez, Raymundo ; Turlings, Ted C. J. ; D’Alessandro, Marco

In: Biological Control, 2012, vol. 60, no. 1, p. 7-15

Synthetic elicitors can be used to induce resistance in plants against pathogens and arthropod herbivores. Such compounds may also change the emission of herbivore-induced plant volatiles, which serve as important cues for parasitic wasps to locate their hosts. Therefore, the use of elicitors in the field may affect biological control of insect pests. To test this, we treated maize seedlings...

Université de Neuchâtel

Does the invasive horse-chestnut leaf mining moth, Cameraria ohridella, affect the native beech leaf mining weevil, Orchestes fagi, through apparent competition?

Péré, Christelle ; Bell, Robert ; Turlings, Ted C. J. ; Kenis, Marc

In: Biodiversity and Conservation, 2011, vol. 20, no. 13, p. 3003-3016

Apparent competition, through the action of shared natural enemies, is frequently suggested as a possible mechanism underlying the impact of invasive alien species on native species, but examples are rare, particularly in insects. A previous study showed that the beech leaf mining weevil, Orchestes fagi, was significantly less abundant close to horse-chestnut trees infested by the invasive...

Université de Neuchâtel

Signal signature of aboveground-induced resistance upon belowground herbivory in maize

Erb, Matthias ; Flors, Victor ; Karlen, Danielle ; de Lange, Elvira S. ; Planchamp, Chantal ; D’Alessandro, Marco ; Turlings, Ted C. J. ; Ton, Jurriaan

In: The Plant Journal, 2009, vol. 59, no. 2, p. 292-302

Plants activate local and systemic defence mechanisms upon exposure to stress. This innate immune response is partially regulated by plant hormones, and involves the accumulation of defensive metabolites. Although local defence reactions to herbivores are well studied, less is known about the impact of root herbivory on shoot defence. Here, we examined the effects of belowground infestation by...

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

Sequence of arrival determines plant-mediated interactions between herbivores

Erb, Matthias ; Robert, Christelle Aurélie Maud ; Hibbard, Bruce E. ; Turlings, Ted C. J.

In: Journal of Ecology, 2011, vol. 99, no. 1, p. 7-15

1. Induced changes in plant quality can mediate indirect interactions between herbivores. Although the sequence of attack by different herbivores has been shown to influence plant responses, little is known about how this affects the herbivores themselves. 2. We therefore investigated how induction by the leaf herbivore Spodoptera frugiperda influences resistance of teosinte...

Université de Neuchâtel

Synergies and trade-offs between insect and pathogen resistance in maize leaves and roots

Erb, Matthias ; Balmer, Yves ; de Lange, Elvira S. ; von Merey, Georg ; Planchamp, Chantal ; Robert, Christelle Aurélie Maud ; Röder, Gregory ; Sobhy, Islam ; Zwahlen, Claudia ; Mauch-Mani, Brigitte ; Turlings, Ted C. J.

In: Plant, Cell & Environment, 2011, vol. 34, no. 7, p. 1088-1103

Determining links between plant defence strategies is important to understand plant evolution and to optimize crop breeding strategies. Although several examples of synergies and trade-offs between defence traits are known for plants that are under attack by multiple organisms, few studies have attempted to measure correlations of defensive strategies using specific single attackers. Such links...

Université de Neuchâtel

Systemic root signalling in a belowground, volatile-mediated tritrophic interaction

Hiltpold, Ivan ; Erb, Matthias ; Robert, Christelle Aurélie Maud ; Turlings, Ted C. J.

In: Plant, Cell & Environment, 2011, vol. 34, no. 8, p. 1267–1275

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...