Temporal modulation and adaptive control of the behavioural response to odours in Rhodnius prolixus
Temporal modulation and adaptive control of the behavioural response to odours in Rhodnius prolixus
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DOI：
10.1016/j.jinsphys.2008.07.004
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发表时间：
2008-09-01
影响因子：
2.2
通讯作者：
Lazzari, Claudio R.
中科院分区：
文献类型：
--
作者：
Bodin, Aurelie;Barrozo, Romina B.;Lazzari, Claudio R.
已经在几种昆虫物种中证明，昼夜节律钟使整个触角化学感受器在每天的特定时间窗口期间更加敏感。该评估提出了关于表现出双峰活动的昆虫如何处理它们对在一天的不同时刻相关的气味的敏感性的问题。为了阐明这个问题，我们研究了Rhodnius prolixus对CO2（主机相关线索）和聚集线索（主机相关线索）的响应的每日动态，这些线索分别在黄昏和黎明时相关。我们分析了：（1）红腹锦鸡对气味的反应是否存在时间调制;（2）这种调节是一种普遍的调节，还是对每种挥发性物质都有特异性，以及（3）它是由外源性还是内源性机制控制的。我们发现，对CO2的反应只发生在黄昏，并组装气味仅限于黎明。自由奔跑条件下的实验表明，只有对CO2的反应是由生物钟控制的，而不是组装信号。因此，通过结合内源性和外源性机制，对不同气味的敏感性根据其相关的行为背景和一天中的时刻进行调整。(C)2008爱思唯尔有限公司保留所有权利。
It has been demonstrated in several insect species that a circadian clock makes the whole of antennal chemoreceptors more sensitive during a particular temporal window every day, This assessment raises the question about how insects exhibiting bimodal activity handle their sensitivity to odours which are relevant at different moments of the day. To shed some light on this problem, We studied in Rhodnius prolixus the daily dynamics of their responsiveness to CO2 (host-associated cue) and aggregation cues (refuge-associated), which are relevant at dusk and dawn, respectively. We analysed: (1) whether a temporal modulation of the responsiveness to odours does exist in R. prolixus, (2) if this modulation is a general one or it is specific for each type of volatile, and (3) if it is controlled by exogenous or endogenous mechanisms. We found that the responsiveness to CO2 only occurs at dusk and that to assembling odours is restricted to dawn. Experiments under free-running conditions revealed that only the responsiveness to CO2 is controlled by a circadian clock, but not that to assembling signals. Thus, by combining endogenous and exogenous mechanisms, sensitivities to different odours are adjusted according to their associated behavioural context and moment of the day. (C) 2008 Elsevier Ltd. All rights reserved.