Symbionts protect aphids from parasitic wasps by attenuating herbivore-induced plant volatiles

Frago Enric, Mala Mukta, Weldegergis Berhane T., Yang Chenjiao, McLean Alisa, Godfray A. Charles J., Gols Rieta, Dicke Marcel. 2017. Symbionts protect aphids from parasitic wasps by attenuating herbivore-induced plant volatiles. Nature Communications, 8 (1860), 9 p.

https://doi.org/10.1038/s41467-017-01935-0

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Outlier, Sujet : MULTIDISCIPLINARY SCIENCES

Résumé : Plants respond to insect attack by releasing blends of volatile chemicals that attract their herbivores' specific natural enemies, while insect herbivores may carry endosymbiotic microorganisms that directly improve herbivore survival after natural enemy attack. Here we demonstrate that the two phenomena can be linked. Plants fed upon by pea aphids release volatiles that attract parasitic wasps, and the pea aphid can carry facultative endosymbiotic bacteria that prevent the development of the parasitic wasp larva and thus markedly improve aphid survival after wasp attack. We show that these endosymbionts also attenuate the systemic release of volatiles by plants after aphid attack, reducing parasitic wasp recruitment and increasing aphid fitness. Our results reveal a novel mechanism through which symbionts can benefit their hosts and emphasise the importance of considering the microbiome in understanding insect ecological interactions.

Mots-clés Agrovoc : Vicia faba, symbiote, plante parasite

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Agences de financement européennes : European Commission

Programme de financement européen : FP7

Projets sur financement : (EU) The role of insect symbionts in host plant use through their effect on plant-induced defenses

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