Stereochemistry plays a significant role in structure–activity relationships of messenger chemicals. The ability to distinguish between enantiomers and geometric isomers, however, may be limited to certain stereoisomeric substances, depending on the receiver. In this study, we assessed the preference of the peripheral olfactometry system of Western Flower Thrips, F. occidentalis towards ubiquitously expressed host compounds, with a goal of establishing whether particular stereoisomers enhance host odour recognition. We demonstrate that the peripheral olfactory system of a highly polyphagous thysanopteran insect has evolved to become highly sensitive to a type of green leaf volatile, which is highly ubiquitous in the plant kingdom. We show that there is a significantly greater antennal response to the cis isomer, more so than the isomerisation by-product trans-3-hexen-1-ol. We demonstrate that the antennae of a highly polyphagous insect are capable of detecting common plant secondary metabolites in both enantiomeric forms.

中文翻译：

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西花蓟马，富兰克氏菌的外围嗅觉系统对常见植物挥发物的立体异构体的偏爱。

立体化学在信使化学物质的构效关系中起着重要作用。然而，取决于受体，区分对映异构体和几何异构体的能力可能限于某些立体异构体。在这项研究中，我们评估了西花蓟马F. occidentalis的外围嗅觉系统对遍在表达的宿主化合物的偏爱，目的是确定特定的立体异构体是否能增强宿主的气味识别能力。我们证明高度多食性thysanopteran昆虫的外围嗅觉系统已演变成对一种绿色的叶挥发物高度敏感，这在植物界中非常普遍。我们表明，对天线的触角反应明显更大。顺式异构体，比异构化副产物反-3-hexen-1-ol更是如此。我们证明高度多食性昆虫的触角能够检测两种对映体形式的常见植物次生代谢产物。