The role of proboscis of the malaria vector mosquito Anopheles stephensi in host-seeking behavior
The role of proboscis of the malaria vector mosquito Anopheles stephensi in host-seeking behavior
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DOI：
10.1186/1756-3305-4-10
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发表时间：
2011-01-27
影响因子：
3.2
通讯作者：
Kanuka, Hirotaka
中科院分区：
文献类型：
--
作者：
Maekawa, Emi;Aonuma, Hiroka;Kanuka, Hirotaka
背景资料：长鼻是昆虫的一个重要头部附属物，在食物摄入过程中处理味觉代码，特别有用的是，考虑到吸血节肢动物经常使用这个长鼻作为探针到达宿主皮肤下的血管。在这里，使用能够量化CO2活化热的自动化设备，（35摄氏度）的疟疾媒介斯氏按蚊的感应行为，我们发现，蚊子的突出喙意外地有助于从远处识别宿主。烧蚀实验表明，不仅触角和下颚须，但也长鼻识别伪热目标。此外，在这种行为期间，喙的功能可以与引起蚊子激活所需的CO2检测分离，这表明蚊子的喙除了“热探针”之外还将喙分为“热天线”。我们的研究结果支持了一个新兴的观点，即在寻找宿主的过程中，长鼻可能是一个重要的装备，并让我们深入了解这些附属物如何从一个共同的起源进化而来，以便发挥天线器官的功能。
Background: The proboscis is an essential head appendage in insects that processes gustatory code during food intake, particularly useful considering that blood-sucking arthropods routinely reach vessels under the host skin using this proboscis as a probe.Results: Here, using an automated device able to quantify CO2-activated thermo (35 degrees C)-sensing behavior of the malaria vector Anopheles stephensi, we uncovered that the protruding proboscis of mosquitoes contributes unexpectedly to host identification from a distance. Ablation experiments indicated that not only antennae and maxillary palps, but also proboscis were required for the identification of pseudo-thermo targets. Furthermore, the function of the proboscis during this behavior can be segregated from CO2 detection required to evoke mosquito activation, suggesting that the proboscis of mosquitoes divide the proboscis into a "thermo-antenna" in addition to a "thermo-probe".Conclusions: Our findings support an emerging view with a possible role of proboscis as important equipment during host-seeking, and give us an insight into how these appendages likely evolved from a common origin in order to function as antenna organs.