Bacterial plant pathogens affect the locomotor behavior of the insect vector: A case study of Citrus volkameriana-Triozae erytreae-Candidatus Liberibacter asiaticus system

Ameline Arnaud, Karkach Alain, Denoirjean Thomas, Grondin Martial, Molinari Maria Florencia, Turpin Patrick, Delatte Hélène, Reynaud Bernard. 2023. Bacterial plant pathogens affect the locomotor behavior of the insect vector: A case study of Citrus volkameriana-Triozae erytreae-Candidatus Liberibacter asiaticus system. Insect Science, 10 p.

https://doi.org/10.1111/1744-7917.13279

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Résumé : Plant pathogens can alter the behavior of their insect vectors as well as their survival and reproduction. The African psyllid, Trioza erytreae, is one of the vectors of Huanglongbing, a citrus disease caused mainly by “Candidatus Liberibacter asiaticus” (CLas). The purpose of this study was to characterize the effects of CLas on the psyllid, T. erytreae using Citrus volkamerina plants as the study system. The study focused more specifically on the CLas effects prior to and after its acquisition by the psyllid T. erytreae. Our results did not support the hypothesis that CLas effects psyllid probing behavior prior to acquisition; few differences were observed between uninfected T. erytrea feeding on CLas-infected versus control plants. On the other hand, compared to psyllids that had completed their development on control plants, the ones that had completed their development on a CLas-infected plant exhibited changes in their behavior (greater velocity), physiology (smaller mass) and biochemistry (lower water and lipid content). Altogether, our results confirm the existence of a marked postacquisition effect on the vector locomotor behavior and a minor preacquisition effect of CLas on the vector behavior, which can be partially explained by physiological and biochemical changes.

Mots-clés Agrovoc : comportement animal, insecte nuisible, agent pathogène, bactérie pathogène, vecteur de maladie, Trioza erytreae

Mots-clés complémentaires : Candidatus liberibacter asiaticus

Mots-clés libres : Electrical penetration graph, Huanglongbing, Locomotory behavior, Lipid biomass, Probing behavior, Vector manipulation

Classification Agris : L20 - Écologie animale

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

Agences de financement européennes : European Commission, European Agricultural Fund for Rural Development

Agences de financement hors UE : Conseil Régional de La Réunion

Programme de financement européen : H2020

Projets sur financement : (EU) Preventing HLB epidemic for ensuring Citrus survival in Europe

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