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Effects of cis-jasmone treatment of brassicas on interactions with myzus persicae aphids and their parasitoid diaeretiella rapae

Ali, Jamin, Covaci, Anca D., Roberts, Joe M., Sobhy, Islam S. ORCID:, Kirk, William D. J. and Bruce, Toby J. A. 2021. Effects of cis-jasmone treatment of brassicas on interactions with myzus persicae aphids and their parasitoid diaeretiella rapae. Frontiers in Plant Science 12 , 7. 10.3389/fpls.2021.711896

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There is a need to develop new ways of protecting plants against aphid attack. Here, we investigated the effect of a plant defence activator, cis-jasmone (CJ), in a range of cultivars of Brassica napus, Brassica rapa and Brassica oleracea. Plants were sprayed with cis-jasmone or blank formulation and then tested with peach potato aphids (Myzus persicae Sulzer) (Hemiptera: Aphididae) and their parasitoid Diaeretiella rapae (M'Intosh) (Hymenoptera: Braconidae). CJ treated plants had significantly lower aphid settlement than control plants in a settlement bioassay. Conversely, in a foraging bioassay, D. rapae parasitoids spent a significantly longer time foraging on CJ treated plants. Our results reveal that CJ treatment makes plants less attractive to and less suitable for M. persicae but more attractive to D. rapae in a range of brassica cultivars. It is likely that these effects are due to changes in volatile emission indicating activation of defence and presence of conspecific competitors to aphids but presence of prey to parasitoids. Increases in volatile emission were found in CJ induced plants but varied with genotype. Among the synthetic volatile compounds that were induced in the headspace of CJ treated brassica cultivars, methyl isothiocyanate, methyl salicylate and cis-jasmone were most repellent to aphids. These results build on earlier studies in Arabidopsis and show that tritrophic interactions are influenced by CJ in a wide range of brassica germplasm. The implication is that CJ is a promising treatment that could be used in brassica crops as part of an integrated pest management system.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Additional Information: This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).
Publisher: Frontiers Media
ISSN: 1664-462X
Date of First Compliant Deposit: 6 December 2021
Date of Acceptance: 23 August 2021
Last Modified: 04 May 2023 10:04

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