Domestication provides durum wheat with protection from locust herbivory

Chapuis Marie-Pierre, Leménager Nicolas, Piou Cyril, Roumet Pierre, Marche Héloïse, Centanni Julia, Estienne Christophe, Ecarnot Martin, Vasseur François, Violle Cyrille, Kazakou Elena. 2023. Domestication provides durum wheat with protection from locust herbivory. Ecology and Evolution, 13 (1):e9741, 15 p.

Url - jeu de données - Dataverse Cirad : https://doi.org/10.18167/DVN1/HFGUJH

Résumé : Lower plant resistance to herbivores following domestication has been suggested as the main cause for higher feeding damage in crops than in wild progenitors. While herbivore compensatory feeding has also been proposed as a possible mechanism for raised damage in crops with low nutritional quality, predictions regarding the effects of plant domestication on nutritional quality for herbivores remain unclear. In particular, data on primary metabolites, even major macronutrients, measured in the organs consumed by herbivores, are scarce. In this study, we used a collection of 10 accessions of wild ancestors and 10 accessions of modern progenies of Triticum turgidum to examine whether feeding damage and selectivity by nymphs of Locusta migratoria primarily depended on five leaf traits related to structural resistance or nutrient profiles. Our results unexpectedly showed that locusts favored wild ancestors over domesticated accessions and that leaf toughness and nitrogen and soluble protein contents increased with the domestication process. Furthermore, the quantitative relationship between soluble protein and digestible carbohydrates was found to poorly meet the specific requirements of the herbivore, in all wheat accessions, both wild and modern. The increase in leaf structural resistance to herbivores in domesticated tetraploid wheat accessions suggested that resource allocation trade-offs between growth and herbivory resistance may have been disrupted by domestication in the vegetative organs of this species. Since domestication did not result in a loss of nutritional quality in the leaves of the tetraploid wheat, our results rather provides evidence for a role of the content of plants in nonnutritive nitrogenous secondary compounds, possibly deterrent or toxic, at least for grasshopper herbivores.

Mots-clés Agrovoc : Triticum turgidum, domestication des plantes, Triticum, plante sauvage

Mots-clés libres : Cereal crops, Domestication syndrome, Feeding selection, Functional ecology, Leaf, Locusta migratoria, Nutritional ecology, Pest insects, Nitrogen content, Plant toughness, Triticum turgidum

Classification Agris : F40 - Écologie végétale
H10 - Ravageurs des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement européennes : European Research Council

Agences de financement hors UE : Centre Méditerranéen de l'Environnement et de la Biodiversité, Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Projets sur financement : (FRA) DINER

Auteurs et affiliations

• Chapuis Marie-Pierre, CIRAD-BIOS-UMR CBGP (FRA) - auteur correspondant
• Leménager Nicolas, CIRAD-BIOS-UMR CBGP (FRA)
• Piou Cyril, CIRAD-BIOS-UMR CBGP (FRA) ORCID: 0000-0002-9378-9404
• Roumet Pierre, Montpellier SupAgro (FRA)
• Marche Héloïse, Montpellier SupAgro (FRA)
• Centanni Julia, Université de Montpellier (FRA)
• Estienne Christophe, CIRAD-BIOS-UMR CBGP (FRA)
• Ecarnot Martin, Université de Montpellier (FRA)
• Vasseur François, Université de Montpellier (FRA)
• Violle Cyrille, CEFE (FRA)
• Kazakou Elena, Montpellier SupAgro (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/603480/)

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