Defence by plant toxins in milkweed bugs (Heteroptera: Lygaeinae) through the evolution of a sophisticated storage compartment
Defence by plant toxins in milkweed bugs (Heteroptera: Lygaeinae) through the evolution of a sophisticated storage compartment
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DOI：
10.1111/syen.12189
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发表时间：
2017-01-01
影响因子：
4.8
通讯作者：
Dobler, Susanne
中科院分区：
文献类型：
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作者：
Bramer, Christiane;Friedrich, Frank;Dobler, Susanne
异翅目昆虫亚科Lygaeinae的物种具有特殊的角质下隔室来储存心脏糖苷，这是一种植物衍生的防御性化合物，它们在捕食者攻击时释放出来。在大型马利筋虫的成虫体内，这些储藏室以前被描述为一种改良的被膜，形成了一个充满液体的背外侧空间。在这里，我们使用连续组织切片的三维成像和基于同步辐射的微型计算机断层扫描数据来揭示这些储存室的形态以及在攻击时用于释放富含心脏糖苷的液体的机制。我们的比较分析表明，所研究的物种的形态和释放机制有所不同。通过重建Lygaeinae最近的分子系统学上的这些特征，我们证明了心脏糖苷的储存和释放的适应性是以一种逐步的方式进化的。
Species of the heteropteran subfamily Lygaeinae possess special subcuticular compartments to store cardiac glycosides, plant-derived defensive compounds, which they release upon predator attack. In adults of the large milkweed bug, Oncopeltus fasciatus, these storage compartments have previously been described as a modified integument, forming a fluid-filled dorsolateral space. Here we use three-dimensional imaging of serial histological sections and synchrotron radiation-based micro-computed tomography data to reveal the morphology of these storage compartments and the mechanisms used for the release of a cardiac glycoside-rich fluid upon attack. Our comparative analysis revealed that the morphology and release mechanism vary among the species investigated. By reconstructing these traits on a recent molecular phylogeny of the Lygaeinae, we demonstrate that the adaptations for the storage and release of cardiac glycosides have evolved in a stepwise manner.