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Effects of cis-Jasmone Treatment of Brassicas on Interactions With Myzus persicae Aphids and Their Parasitoid Diaeretiella rapae.

Ali, J; Covaci, AD; Roberts, JM; Sobhy, IS; Kirk, WDJ; Bruce, TJA

Effects of cis-Jasmone Treatment of Brassicas on Interactions With Myzus persicae Aphids and Their Parasitoid Diaeretiella rapae. Thumbnail


Authors

J Ali

AD Covaci

JM Roberts

IS Sobhy

WDJ Kirk



Abstract

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.

Citation

Ali, J., Covaci, A., Roberts, J., Sobhy, I., Kirk, W., & Bruce, T. (2021). Effects of cis-Jasmone Treatment of Brassicas on Interactions With Myzus persicae Aphids and Their Parasitoid Diaeretiella rapae. Frontiers in Plant Science, 711896 - ?. https://doi.org/10.3389/fpls.2021.711896

Acceptance Date Aug 23, 2021
Publication Date Oct 1, 2021
Journal Frontiers in Plant Science
Publisher Frontiers Media
Pages 711896 - ?
DOI https://doi.org/10.3389/fpls.2021.711896
Keywords induced defence, aphid, tritrophic interactions, biological control, crop protection
Publisher URL https://www.frontiersin.org/articles/10.3389/fpls.2021.711896/full

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