Chemical identity and functional characterization of semiochemicals that promote the interactions between rice plant and rice major pest Nilaparvata lugens

Zhang, Zhenfei, Liu, Yong, Portaluri, Vincent, Woodcock, Christine, Pickett, John A. ORCID: https://orcid.org/0000-0002-1008-6595, Wang, Senshan and Zhou, Jing-Jiang 2021. Chemical identity and functional characterization of semiochemicals that promote the interactions between rice plant and rice major pest Nilaparvata lugens. Journal of Agricultural and Food Chemistry 69 (16) , 4635–4644. 10.1021/acs.jafc.1c01135

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Abstract

The interaction between food crops and insect pests is mediated by semiochemicals emitted from host plants. These semiochemicals are natural behavioral modifiers and act on the insect olfactory system to locate hosts and preys. In this study, eight rice neuroactive semiochemicals were identified from rice varieties by GC–EAG and GC–MS. Their ability to modify rice pest behaviors was further studied as individual chemicals and physiologically relevant blend. The total amount of each semiochemical and the expression of their biosynthesis genes were significantly higher in pest susceptible variety than in pest-resistant variety and upregulated by the infestation of the pest Nilaparvata lugens (BPH). The semiochemicals emitted by uninfested plants (UIRVs) were more attractive to BPHs. Interestingly, the attractiveness of UIRVs was significantly reduced by the addition of the blend that mimics the natural composition of these semiochemicals emitted by infested plants (IRVs). Our study suggests a mechanism for the spread of pest infestation from infested plants to uninfested plants nearby. UIRVs initially serve as attractive signals to rice insect pests. The pest infestation changes the rice semiochemical profile to be less attractive or even repellent, which pushes further colonization to uninfested plants nearby. The identified semiochemicals can be used for crop protection based on a push–pull strategy.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Publisher:	American Chemical Society
ISSN:	0021-8561
Date of First Compliant Deposit:	11 May 2021
Date of Acceptance:	6 April 2021
Last Modified:	15 Nov 2024 19:45
URI:	https://orca.cardiff.ac.uk/id/eprint/141224

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