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首页> 外文期刊>Journal of Chemical Ecology >Response of the Ladybird Parasitoid Dinocampus coccinellae to Toxic Alkaloids from the Seven-spot Ladybird, Coccinella septempunctata
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Response of the Ladybird Parasitoid Dinocampus coccinellae to Toxic Alkaloids from the Seven-spot Ladybird, Coccinella septempunctata

机译：七点瓢虫瓢虫对七种瓢虫的有毒生物碱的瓢虫寄生类Dinocampus球菌的响应。

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摘要

Electrophysiological and behavioral responses of the ladybird parasitoid Dinocampus coccinellae to volatiles from the seven-spot ladybird, Coccinella septempunctata, were investigated to identify semiochemicals involved in host location. Coupled gas chromatography–electroantennography (GC-EAG) with D. coccinellae located a small peak of prominent activity in an extract of volatiles from adult C. septempunctata. The active compound was identified by coupled GC-mass spectrometry and by comparison with an authentic sample as the free-base alkaloid precoccinelline, which forms part of the toxic defense of this ladybird. Behavioral studies in an olfactometer showed that D. coccinellae was significantly attracted to the volatile extract and also to the alkaloid. Myrrhine, a stereoisomer of precoccinelline found in low amounts in C. septempunctata and in other ladybird species, was shown to be electrophysiologically active and significantly attractive. Perception of ladybird alkaloids by D. coccinellae is a rare example of toxicants acting as aerially transmitted cues for interactions between the third and fourth trophic levels.
机译：瓢虫寄生类拟南芥球菌对七点瓢虫七星瓢虫Cococinella septempunctata挥发物的电生理和行为响应进行了调查，以确定参与寄主位置的化学信息素。带有球菌的气相色谱-电子血管造影术（GC-EAG）在成年C. septempunctata的挥发物提取物中发现了一个突出活性的小峰。通过偶合气相色谱-质谱法，并与真实样品进行比较，鉴定出该活性化合物为游离碱生物碱前椰菜碱，这是该瓢虫毒性防御的一部分。嗅觉仪上的行为研究表明，球藻D.coccinellae显着吸引了挥发性提取物和生物碱。没药是一种前球藻胆碱的立体异构体，在七叶蝉和其他瓢虫物种中的含量很低，被证明具有电生理活性并具有明显的吸引力。 D.球菌对瓢虫生物碱的感知是毒性的罕见例子，它是第三和第四营养级之间相互作用的空中提示。

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