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Defensive Roles of (E)-2-Alkenals and Related Compounds in Heteroptera

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Abstract

We examined whether shared volatiles found in various heteropteran species and developmental stages function to repel predators. The nymphal dorsal abdominal gland secretions of Riptortus pedestris (Heteroptera: Alydidae) and Thasus acutangulus (Heteroptera: Coreidae), and the metathoracic scent gland secretion of Euschistus biformis (Heteroptera: Pentatomidae) adults were identified by gas chromatography/mass spectrometry (GC/MS). (E)-2-Hexenal, 4-oxo-(E)-2-hexenal (4-OHE), and (E)-2-octenal were found in all three species and deemed likely candidates for repelling predators. In addition to (E)-2-alkenals, the adult E. biformis secreted (E)-2-hexenyl acetate, (E)-2-octenyl acetate, and four hydrocarbons. We evaluated the potential predator repellent properties of these compounds and compound blends against a generalist, cosmopolitan insect predator, the Chinese praying mantid (Mantodea: Mantidae: Tenodera aridifolia sinensis). Mantids that experienced (E)-2-hexenal, (E)-2-octenal, and (E)-2-octenyl acetate moved away from the site of interaction, while 4-OHE and (E)-2-hexenyl acetate did not affect mantid behavior. The compound blends did not have additive or synergistic repellency effects on predator behavior. Compound repellency was not related to compound volatility. Instead, the repellent effect is likely related to predator olfaction, and the affinity of each compound to receptors on the antennae. Our results also suggest the repellents might intensify the visual defensive signals of aposematism (T. acutangulus nymphs) and mimicry (R. pedestris nymphs) in heteropteran bugs.

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Acknowledgments

We thank Carl W. Schaefer (University of Connecticut), Carl A. Olson, Sarai Olivier (University of Arizona) for help with insect identification, Alexander L. Wild (University of Arizona) for photographs of the insects, and Gabriela and D. Lawrence Venable (University of Arizona) for insect-collecting assistance. We are also grateful to Neil Jacobsen and Guangxin Lin (University of Arizona) for acquiring the NMR spectra. This work was funded by a seed grant from the BIO5 institute, University of Arizona to J. X. B. The GC–MS, a PerkinElmer Turbo Mass, partly used in this study is a commonly shared instrument at Akita Prefectural University.

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Correspondence to Koji Noge.

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Noge, K., Prudic, K.L. & Becerra, J.X. Defensive Roles of (E)-2-Alkenals and Related Compounds in Heteroptera. J Chem Ecol 38, 1050–1056 (2012). https://doi.org/10.1007/s10886-012-0166-y

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