Circadian rhythm of behavioural responsiveness to carbon dioxide in the blood-sucking bug Triatoma infestans (Heteroptera: Reduviidae)
Circadian rhythm of behavioural responsiveness to carbon dioxide in the blood-sucking bug Triatoma infestans (Heteroptera: Reduviidae)
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DOI：
10.1016/j.jinsphys.2004.01.001
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发表时间：
2004-02-01
影响因子：
2.2
通讯作者：
Lazzari, CR
中科院分区：
文献类型：
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作者：
Barrozo, RB;Minoli, SA;Lazzari, CR
研究了侵染三角瘤（Triatoma infestans）幼虫对二氧化碳行为反应的时间调节及其时间生物学基础。我们分析了3种不同光照条件下昆虫对CO2的取向：(1)12h光照/ 12h黑暗循环（L/D），(2)恒定黑暗（D/D）和(3)恒定光照（L/L）。当维持在L/ D条件下时，昆虫仅在幼虫期的前几个小时对添加1500ppm CO2的气流表现出定向响应。在D/D条件下维持的昆虫在主观夜的头几个小时对CO2也表现出积极的定向反应。L/L下的bug没有表现出有节奏的定向行为。因此，侵染T菌仅在菌丝期开始时才表现出每日向二氧化碳（即潜在的食物来源）定向的节奏。在持续的黑暗下，这种节奏的持续存在揭示了这种行为的内源性昼夜节律控制的存在。(C) 2003 Elsevier Ltd.版权所有。
The temporal modulation of the behavioural response to carbon dioxide and its chronobiological basis were investigated in larvae of Triatoma infestans. We analysed the orientation towards CO2 of insects kept under three different illumination regimes: (1) 12 h light/12 h darkness cycles (L/D), (2) constant darkness (D/D) and (3) constant light (L/L). When maintained under L/ D conditions, insects exhibited an oriented response towards airstreams added with 1500 ppm of CO2 during the first hours of the scotophase only. Bugs maintained under D/D also showed a positive orientation response towards CO2 during the first hours of the subjective night, while. bugs kept under L/L did not show a rhythmic oriented behaviour. Thus, T infestans displayed a daily rhythm of orientation towards CO2 (i.e. a potential food source) only at the beginning of the scotophase. The persistence of the rhythm under constant darkness reveals the existence of an endogenous circadian control of this behaviour. (C) 2003 Elsevier Ltd. All rights reserved.