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Function of infochemicals produced at the damage in a tritrophic interaction.

三营养相互作用中损伤处产生的信息化学物质的功能。

基本信息

批准号：
09640759
负责人：
SATO Yoshibumi
金额：
$ 1.73万
依托单位：
Kyoto College of Medical Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Cotesia glomerata, a parasitoid of P. rapae larvae, is attracted by a damage made by host larvae and shows intensive searching behavior. The major components of the chemicals produced at the damaged site were fatty acids, palmitic acid and stearic acid. The feeding experiments by Pieris rapae larvae suggested that the fatty acids were feeding attractants of the larvae. Meanwhile, we found that Pieris rapae larvae secreted oily droplets from the dorsal setae. GC-MS analysis showed that palmitic acid and stearic acid were the major components of this secretion.In Hokkaido, we studied oviposition preference of four Pieris butterflies, P. rapae crucivora, P. melete, P. napinesis and P. brassicae, toward six species of food plants in a cage under natural and carried out feeding experiments using larvae of the four Pieris speciesand the six species of plants. The results of the experiments showed that Rorippa sylvestris was relatively intrinsically superior plants for larvae of each species. On the other hand, Arabis pendula was very inferior, even for P. napi, which uses it as a usual food plant. But a oviposition preference test showed ovipositing female butterflies of P. rapae preferred cabbage plants to R. sylvestris and P. melete selected Cardamine leucantha, but did not oviposit on R. sylvestris.In the field condition Cotesia glomerata parasitized P. brassicae larvae. But according to the parasitization experiment, C. glomerata egressed from P. rapae larvae in Hokkaido did not oviposit in larvae of P. brassicae.

Cotesia glomerata 是菜籽油菜幼虫的寄生蜂，受到寄主幼虫造成的损害所吸引，并表现出密集的搜索行为。受损部位产生的化学物质的主要成分是脂肪酸、棕榈酸和硬脂酸。菜青虫幼虫的摄食实验表明，脂肪酸是幼虫的摄食引诱剂。同时，我们发现菜青虫幼虫的背刚毛会分泌油滴。 GC-MS分析表明，棕榈酸和硬脂酸是这种分泌物的主要成分。在北海道，我们研究了4种菜粉蝶（菜粉蝶P. rapae crucivora）、黑粉蝶P. melete、油菜粉蝶P. napinesis和菜粉蝶P. brasicae在自然条件下对笼内6种食用植物的产卵偏好，并用这4种菜粉蝶和6种植物的幼虫进行了取食实验。实验结果表明，对于各物种的幼虫来说，樟子松是本质上相对优越的植物。另一方面，南芥的品质非常低劣，甚至对于将其作为常用食用植物的南芥来说也是如此。但产卵偏好试验显示，产卵的雌性菜花蝶优先选择甘蓝植物，而小菜花蝶则选择白花碎米荠，但不产卵。田间条件下，小菜花蝶寄生甘蓝菜幼虫。但根据寄生实验，从北海道菜籽油菜幼虫中排出的球状小蠹并没有在甘蓝菜幼虫中产卵。