| Venom gland of the ichneumonid Diadromus collaris： morphology, ultrastructure and age-related changes |
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| 作者姓名： | WEI-DI LI RUI-XIAN YU XUE-XIN CHEN JUN-HUA HE |
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| 作者单位： | Institute of Applied Entomology, Zhejiang University, Hangzhou, China |
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| 基金项目： | We are grateful to Professor Hong Jian and Mrs Yuexian Fang （Zhejiang University, Hangzhou） for their help with transmission electron microscopy. Funding for this study was provided jointly by National Natural Science Foundation of China （NSFC number： 30370959） and Program for New Century Excellent Talents in University （NCET-04- 0521）. |
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| 摘 要： | Females of the solitary parasitoid Diadromus collaris （Insecta： Hymenoptera： Ichneumonidae） lay eggs in the pupae of Plutella xylostella （Lepidoptera： Plutellidae）, and the venom is synchronously injected into hosts. The venom apparatus consists of two glandular tubules terminating in a common reservoir, A ductule connects the reservoir with the sting apparatus, by which the reservoir content enters the latter. Secretory units line the two glandular tubules. All secretory cells belong to dermal gland type Ⅲ. Dermal gland cells in glandular tubules are more abundant and developed than those in the reservoir. There are extensive rough endoplasmic reticulum and electrondense vesicles, and the microvilli are well developed. By the cuticle-lined central funnel secretion products of secretory units reach the reservoir. Moreover, the secretory apparatus undergoes age-related changes. The secretory units in the venom gland are better developed and more vigorous 7 days after eclosion than those 1 day after eclosion; autolytic processes occur 15 days after eclosion, and the tissue of the reservoir is more prostrate 15 day after eclosion than those 1 day after eclosion. The ovipostion peak of this parasitoid, about 3-7 days after eclosion, corresponds with the period when the venom gland is highly developed in the life span of the wasp.
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| 关 键 词： | 毒液腺 形态学 超微结构 年龄 姬蜂科 |
| 收稿时间： | 2006-01-16 |
| 修稿时间： | 2006-01-16 |
Venom gland of the ichneumonid Diadromus collaris: morphology, ultrastructure and age-related changes |
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| Authors: | WEI-DI LI RUI-XIAN YU XUE-XIN CHEN JUN-HUA HE |
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| Institution: | Institute of Applied Entomology, Zhejiang University, Hangzhou, China |
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| Abstract: | Abstract Females of the solitary parasitoid Diadromus collaris (Insecta: Hymenoptera: Ichneumonidae) lay eggs in the pupae of Plutella xylostella (Lepidoptera: Plutellidae), and the venom is synchronously injected into hosts. The venom apparatus consists of two glandular tubules terminating in a common reservoir. A ductule connects the reservoir with the sting apparatus, by which the reservoir content enters the latter. Secretory units line the two glandular tubules. All secretory cells belong to dermal gland type III. Dermal gland cells in glandular tubules are more abundant and developed than those in the reservoir. There are extensive rough endoplasmic reticulum and electrondense vesicles, and the microvilli are well developed. By the cuticle-lined central funnel secretion products of secretory units reach the reservoir. Moreover, the secretory apparatus undergoes age-related changes. The secretory units in the venom gland are better developed and more vigorous 7 days after eclosion than those 1 day after eclosion; autolytic processes occur 15 days after eclosion, and the tissue of the reservoir is more prostrate 15 day after eclosion than those 1 day after eclosion. The ovipostion peak of this parasitoid, about 3–7 days after eclosion, corresponds with the period when the venom gland is highly developed in the life span of the wasp. |
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| Keywords: | age-related changes Diadromus collaris Ichneumonidae morphology ultrastructure venom gland |
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