Comparison of male antennal morphology and sensilla physiology for sex pheromone olfactory sensing between sibling moth species: Ectropis grisescens and Ectropis obliqua (Geometridae)

文献类型: 外文期刊

第一作者: Liu Jing

作者: Liu Jing;Li Zhaoqun;Luo Zongxiu;Cai Xiaoming;Bian Lei;Xin Zhaojun;Chen, Zongmao

作者机构:

关键词: olfactory sensing neurons; reproductive isolation; single sensillum recording; tea pest; trichodea sensilla

期刊名称:ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY ( 影响因子:1.698; 五年影响因子:1.758 )

ISSN: 0739-4462

年卷期: 2019 年 101 卷 1 期

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收录情况: SCI

摘要: Ectropis grisescens and Ectropis obliqua (Lepidoptera: Geometridae) are sibling pest species that co-occur on tea plants. The sex pheromone components of both species contain (Z,Z,Z)-3,6,9-octadecatriene and (Z,Z)-3,9-cis-6,7-epoxy-octadecadiene. E. obliqua has (Z,Z)-3,9-cis-6,7-epoxy-nonadecadiene as an additional sex pheromone component, which ensures reproductive segregation between the two species. To ascertain the detection mechanism of olfactory organs for sex pheromone components of E. grisescens and E. obliqua, we applied scanning electron microscopy and single sensillum recording to compare antennal morphology and sensillum physiology in the two species. There was no apparent morphological difference between the antennae of the two species. Both species responded similarly to all three sex pheromone components, including, E. obliqua specific component. The distribution patterns of antennal sensilla trichodea differed between the two species. Sex pheromone olfactory sensing in these sibling species appears to be determined by the density of different types of olfactory sensing neurons. Dose-dependent responses of sensilla trichodea type 1 to (Z,Z)-3,9-cis-6,7-epoxy-octadecadiene, the most abundant component, showed an "all or none" pattern and the other two components showed sigmoidal dose-response curves with a half threshold of 10(-4) (dilution equal to the concentration of 10 mu g/mu l). These results suggest that the major sex pheromone component functions as an on-off controller while secondary components function as modulators during olfactory transmission to the primary olfactory center.

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