黑蝗对植物气味及其挥发性化合物的嗅觉反应(英文)

本文使用触角电位技术研究了黑蝗雄虫的嗅觉反应,测试的材料包括5种植物叶片、9种植物挥发性气味化合物及它们的定量混合物。在5种植物材料中,路易斯安纳蒿和紫花苜蓿能引起更大的电位反应,而3种禾本科植物的反应相对较小。在绿色气味化合物中,6-碳醇类如E-2-hexen-l-ol和E-3-hexen-l-ol导致最高的电位反应,而pentenol、3-pentanone与空白对照间并无明显差异。在3种或4种挥发性化合物的混合物中,没有含pentenol的组合总是引起较高的电位。因此,该项研究证明pentenol和3-pentanone在这种多食性黑蝗的嗅觉定位中所起的作用不明显。另外,结合触角电位的数据资料,作者讨论了寄主植物挥发性化合物在该种蝗虫定位和选择寄主植物方面的作用。

OLFACTORY RESPONSE OF THE GRASSHOPPER MELANOPLUS SANGUINIPES TO PLANT ODOURS AND VOLATILE COMPOUNDS

Electroantennograms (EAGs) were recorded from male adults of Melanoplus sanguinipes to foliage odours from 5 plam species and 9 volatile compounds as well as their blends. Higher EAG responses were recorded for Louisianna sage and Alfalfa foliages, compared to other three gramineous plants. Among green odour chemicals, 6-carbon alcohols (e.g. E-2-hexen-l-ol and E-3-hexen-l-ol) resulted in the high-est EAG responsas. No significant differences among the pentenol. 3-pentanone and blank control were observed. In ternary and quaternary mixture tests of volatile compounds, the combinations with pentenol did not elicit greater amplitudes; thus pentenol and 3-pentanone were proved to be unimportant to the re-sponse of this generalist grasshopper. The EAG data are discussed with regard to the role of host plant volatiles in host plant orientation and selection by the grasshopper.