Plant-to-plant defence induction in cotton is mediated by delayed release of volatiles upon herbivory

Grandi Luca, Ye Wenfeng, Clancy Mary V., Vallat Armelle, Glauser Gaétan, Abdala-Roberts Luis, Brevault Thierry, Benrey Betty, Turlings Ted C. J., Bustos-Segura Carlos. 2024. Plant-to-plant defence induction in cotton is mediated by delayed release of volatiles upon herbivory. New Phytologist, 244 (6) : 2505-2517.

https://doi.org/10.1111/nph.20202?af=R

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Url - jeu de données - Entrepôt autre : https://zenodo.org/records/12706960

Résumé : Caterpillar feeding immediately triggers the release of volatile compounds stored in the leaves of cotton plants. Additionally, after 1 d of herbivory, the leaves release other newly synthesised volatiles. We investigated whether these volatiles affect chemical defences in neighbouring plants and whether such temporal shifts in emissions matter for signalling between plants. Undamaged receiver plants were exposed to volatiles from plants infested with Spodoptera caterpillars. For receiver plants, we measured changes in defence-related traits such as volatile emissions, secondary metabolites, phytohormones, gene expression, and caterpillar feeding preference. Then, we compared the effects of volatiles emitted before and after 24 h of damage on neighbouring plant defences. Genes that were upregulated in receiver plants following exposure to volatiles from damaged plants were the same as those activated directly by herbivory on a plant. Only vola- tiles emitted after 24 h of damage, including newly produced volatiles, were found to increase phytohormone levels, upregulate defence genes, and enhance resistance to caterpillars. These results indicate that the defence induction by volatiles is a specific response to de novo synthesised volatiles, suggesting that these compounds are honest signals of herbivore attack. These findings point to an adaptive origin of airborne signalling between plants.

Mots-clés Agrovoc : Gossypium hirsutum, Gossypium, composé volatil, préférence alimentaire, gossypol, défense chimique, mécanisme de défense, herbivore

Mots-clés libres : Defence induction, Gossypium hirsutum, Herbivory-induced plant volatiles (HIPVs), Plant defence, Plant signalling, Plant–plant communication, Volatile organic compounds (VOCs)

Classification Agris : F60 - Physiologie et biochimie végétale
H01 - Protection des végétaux - Considérations générales

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

Agences de financement hors UE : Swiss National Science Foundation

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