4.7 Article

Chemical Identity and Functional Characterization of Semiochemicals That Promote the Interactions between Rice Plant and Rice Major Pest Nilaparvata lugens

Journal

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 69, Issue 16, Pages 4635-4644

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c01135

Keywords

semiochemical; terpenes; pest colonization; push-pull; Nilaparvata lugens; brown planthopper; rice; pest resistance

Funding

  1. National Natural Science Foundation of China [31501633]
  2. Special Fund for Scientific Innovation Strategy Construction of High Level Academy of Agriculture Science, Guangdong Academy of Agricultural Sciences, China [R3018QD-054]
  3. Cooperation Innovation Centre of Efficient Production with High Annual Yield of Wheat and Corn, Shandong Province, China
  4. Cardiff University
  5. BBSRC [BB/J020281/1, BB/L001683]
  6. BBSRC Global Challenge Research Fund (GCRF-IAA)
  7. Program of Introducing Talents to Chinese Universities (111 Program) [D20023]
  8. Biotechnology and Biological Sciences Research Council (BBSRC) of the UK
  9. BBSRC [BB/J020281/1] Funding Source: UKRI

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The interaction between food crops and insect pests is mediated by semiochemicals emitted from host plants. The study identified eight rice neuroactive semiochemicals and found that uninfested plants emit semiochemicals that are attractive to pests, but this attractiveness can be reduced by adding a blend mimicking the composition of semiochemicals emitted by infested plants. This research suggests a mechanism for the spread of pest infestation from infested plants to nearby uninfested plants, which can be used for crop protection strategies.
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.

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