« Previous Abstract"Geraniol dehydrogenase, the key enzyme in biosynthesis of the alarm pheromone, from the astigmatid mite Carpoglyphus lactis (Acari: Carpoglyphidae)"    Next Abstract"Herbivore-induced phenylacetonitrile is biosynthesized from de novo-synthesized L-phenylalanine in the giant knotweed, Fallopia sachalinensis" »

J Chem Ecol

Title:		Defensive roles of (E)-2-alkenals and related compounds in heteroptera
Author(s):		Noge K; Prudic KL; Becerra JX;
Address:		"Department of Entomology, University of Arizona, Tucson, AZ 85721, USA. noge@akita-pu.ac.jp"
Journal Title:		J Chem Ecol
Year:		2012
Volume:		20120725
Issue:		8
Page Number:		1050 - 1056
DOI:		10.1007/s10886-012-0166-y
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
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"
Keywords:		Aldehydes/analysis/isolation & purification/pharmacology Animals Gas Chromatography-Mass Spectrometry Heteroptera/*chemistry Pheromones/*analysis/isolation & purification/pharmacology Predatory Behavior/drug effects Scent Glands/chemistry;
Notes:		"MedlineNoge, Koji Prudic, Kathleen L Becerra, Judith X eng Research Support, Non-U.S. Gov't 2012/10/12 J Chem Ecol. 2012 Aug; 38(8):1050-6. doi: 10.1007/s10886-012-0166-y. Epub 2012 Jul 25"