ELECTROPHYSIOLOGICAL RESPONSES OF RECEPTOR NEURONS IN MOSQUITO MAXILLARY PALP SENSILLA TO CARBON-DIOXIDE
ELECTROPHYSIOLOGICAL RESPONSES OF RECEPTOR NEURONS IN MOSQUITO MAXILLARY PALP SENSILLA TO CARBON-DIOXIDE
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DOI：
10.1007/bf00187475
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发表时间：
1995-10-01
期刊：
影响因子：
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通讯作者：
OCONNELL, RJ
中科院分区：
文献类型：
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作者：
GRANT, AJ;WIGTON, BE;OCONNELL, RJ
雌性埃及伊蚊（Aedes negegypti）上颌触须上的基本感受器含有一个受体神经元，该神经元对低浓度（150-300 ppm）的二氧化碳（CO2）产生相-张力模式的动作电位反应，这是一种已知与寻找宿主行为有关的刺激。这些受体神经元对二氧化碳浓度的小增量（例如50 ppm）有可靠的反应。我们特别感兴趣的是评估这种可能性，即对二氧化碳浓度阶跃增加的敏感性可以通过二氧化碳背景水平的变化来调节，在寻找宿主的过程中可能会遇到一个范围。我们在这里报告，对给定浓度的CO2单脉冲的响应（脉冲数/秒）似乎与CO2的背景水平无关，除非该水平等于或大于刺激脉冲的浓度。其他种类的雌性蚊子，包括：斯氏按蚊、致倦库蚊、黑库蚊和带喙伊蚊，也具有感受器神经元，对二氧化碳刺激的敏感性相当。然而，在上颌触须的外部形态和沿触须的感受器分布上都有很大的种间差异。男性Ae。埃及伊蚊在形态上有类似的感受器，也包含一个对二氧化碳作出反应的受体神经元。
Sensilla basiconica on the maxillary palps of female Aedes negypti contain a receptor neuron which produces a phasic-tonic pattern of action potential response to low concentrations (150-300 ppm) of carbon dioxide (CO2), a stimulus known to be involved with host seeking behavior. These receptor neurons respond reliably to small increments in CO2 concentration (e.g., 50 ppm). We were particularly interested in evaluating the possibility that the sensitivity to step increases in CO2 concentration could be modulated by alterations in the background levels of CO2, over a range which might be encountered during host-seeking behavior. We report here that the response (impulses/s) to a single pulse of a given concentration of CO2 appears to be independent of the background level of CO2, unless that level is equal to or greater than the concentration of the stimulus pulse. Females of other mosquito species, including: Anopheles stephensi, Culex quinquefasciatus, Culiseta melanura, and Aedes taeniorhynchus, also possess sensilla with receptor neurons that respond with comparable sensitivity to CO2 stimulation. However, there is much interspecific variation in both the external morphology of the maxillary palp and the distribution of sensilla along the palp. Male Ae. aegypti have morphologically similar sensilla which also contain a receptor neuron that responds to CO2.