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Identification of Olfactory Volatiles using Gas Chromatography-Multi-unit Recordings GCMR in the Insect Antennal Lobe
Published on: February 24, 2013
Unveiling Chemical Cues of Insect-Tree and Insect-Insect Interactions for the Eucalyptus Weevil and Its Egg
Davide Mendes1, Sofia Branco2,3, Maria Rosa Paiva3
1Associated Laboratory for Green Chemistry (LAQV) of the Network of Chemistry and Technology (REQUIMTE), Chemistry Department, NOVA School of Science and Technology, NOVA University of Lisbon, 2829-516 Caparica, Portugal.
Researchers identified a pheromone blend attractive to both male and female eucalyptus weevils, Gonipterus platensis. This discovery, using advanced gas chromatography, reveals key semiochemicals influencing host plant selection behavior.
Area of Science:
- Analytical Chemistry
- Chemical Ecology
- Entomology
Background:
- Multidimensional gas chromatography offers superior resolution for analyzing complex matrices compared to 1D methods.
- Understanding insect semiochemicals is crucial for pest management and ecological studies.
- The eucalyptus weevil, Gonipterus platensis, poses a significant threat to eucalyptus plantations.
Purpose of the Study:
- To identify volatile organic compounds (VOCs) emitted by eucalyptus host plants that mediate host selection behavior in Gonipterus platensis.
- To determine if a blend of identified compounds is more attractive to G. platensis than individual components.
- To investigate the role of semiochemicals in the host-plant selection of the eucalyptus weevil.
Main Methods:
- Volatile organic compounds (VOCs) were collected using headspace solid phase microextraction (HS-SPME), MonoTrap disks, and simultaneous distillation-extraction (SDE).
- One-dimensional (1D) and two-dimensional (2D) gas chromatography (GC×GC and H/C-MD-GC) coupled with mass spectrometry (MS) and electroantennographic detection (EAD) were employed.
- Behavioral assays were conducted using a two-arm olfactometer with video tracking to assess the attractiveness of identified compounds.
Main Results:
- A blend of specific semiochemicals, including cis and trans-verbenol, verbenene, myrtenol, and trans-pinocarveol, was identified as attractive to G. platensis.
- The identified pheromone blend demonstrated significantly higher attractiveness to both male and female weevils compared to individual compounds.
- Electroantennographic detection confirmed the olfactory relevance of the identified semiochemicals to the insect.
Conclusions:
- The study successfully identified a behaviorally active pheromone blend for Gonipterus platensis.
- This blend plays a critical role in mediating host selection behavior in this eucalyptus pest.
- The findings provide a foundation for developing novel, semiochemical-based pest management strategies for Gonipterus platensis.
