Ochieng S A, Park K C, Baker T C
Department of Entomology, Iowa State University, Ames, IA 50011, USA.
J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2002 May;188(4):325-33. doi: 10.1007/s00359-002-0308-8. Epub 2002 Apr 12.
Single-cell electrophysiological recordings were obtained from olfactory receptor neurons in antennal trichoid sensilla of male corn earworm, Helicoverpa zea. Spontaneous activity of the neuron specific for the major component ( Z)-11-hexadecenal, the conspecific female-emitted sex pheromone, was not affected by exposure to host plant volatiles. However, stimulations with binary mixtures of a threshold dosage of the pheromone component and increasing dosages of either linalool or ( Z)-3-hexenol significantly synergized the pheromone-specific neuron's firing rates compared with responses to the major pheromone component alone. Cross-adaptation studies confirmed that the enhanced impulses originated from the pheromone-component-tuned neuron. Because plant volatiles do not stimulate the pheromone-specific neuron when presented alone, the pheromone plus host odor blend would be interpreted as containing more pheromone than it actually does when processed by the pheromone-processing portion of the antennal lobe.
从雄性玉米穗虫（Helicoverpa zea）触角毛形感器中的嗅觉受体神经元获得了单细胞电生理记录。对主要成分（Z）-11-十六碳烯醛（同种雌性释放的性信息素）具有特异性的神经元的自发活动，不受暴露于寄主植物挥发物的影响。然而，与单独对主要信息素成分的反应相比，用阈值剂量的信息素成分与递增剂量的芳樟醇或（Z）-3-己烯醇的二元混合物刺激，显著增强了信息素特异性神经元的放电频率。交叉适应研究证实，增强的冲动源自信息素成分调谐的神经元。由于植物挥发物单独呈现时不会刺激信息素特异性神经元，当触角叶的信息素处理部分对其进行处理时，信息素与寄主气味混合物会被解释为所含信息素比实际更多。
