Department of Entomology, University of Missouri, 65211, Columbia, Missouri.
J Chem Ecol. 1992 Oct;18(10):1761-73. doi: 10.1007/BF02751101.
Antennal olfactory responses of the parasitoid,Microplitis croceipes (Cresson) (Hymenoptera: Braconidae), to 29 cotton volatile compounds were measured by electroantennogram (EAG) techniques. No significant sexual differences were found in EAGs of males and females to volatiles emanating from 100-μg stimulus loads of the 29 cotton compounds. Green leaf volatiles (saturated and monounsaturated six-carbon alcohols, aldehydes, and their acetate derivatives), heptanal, and the benzene derivatives, benzaldehyde and acetophenone, elicited the largest EAGs. Monoterpenes elicited moderate EAGs withβ-ocimene being the most effective monoterpene tested. Among the sesquiterpenes tested,β-bisabolol was the most effective stimulus at the 100-μg dose. Dose-response curves constructed from EAGs of females revealed a low threshold for (Z)-3-hexenyl acetate, a compound previously shown to be an effective attractant in wind-tunnel bioassays. Comparison of relative volatilities of the various odorants indicated differential selectivity and sensitivity ofM. croceipes antennal receptors to them. The roles of cotton plant volatiles in host habitat location ofM. croceipes are discussed.
触角嗅觉反应的寄生蜂，小茧蜂（膜翅目：Braconidae），29 种棉挥发物通过触角电位（EAG）技术进行测量。雌雄个体对 29 种棉挥发物的 100-μg 刺激负荷产生的 EAG 无显著的性别差异。绿叶挥发物（饱和和单不饱和的六碳醇、醛及其醋酸酯衍生物）、庚醛和苯衍生物苯甲醛和苯乙酮引起最大的 EAG。单萜产生适度的 EAG，β-罗勒烯是测试的最有效的单萜。在所测试的倍半萜中，β-双醇在 100-μg 剂量下是最有效的刺激物。由雌性 EAG 构建的剂量反应曲线显示（Z）-3-己烯基醋酸酯的低阈值，该化合物以前在风洞生物测定中被证明是一种有效的引诱剂。对各种气味剂相对挥发性的比较表明，M.小茧蜂触角受体对它们具有不同的选择性和敏感性。讨论了棉花植物挥发物在 M.小茧蜂宿主栖息地定位中的作用。
