Olfactory and behavioural responses of the blood-sucking bug Triatoma infestans to odours of vertebrate hosts.
Olfactory and behavioural responses of the blood-sucking bug Triatoma infestans to odours of vertebrate hosts.
复制标题
吸血虫 Triatoma infestans 对脊椎动物宿主气味的嗅觉和行为反应。
DOI：
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发表时间：
2001
影响因子：
2.8
通讯作者：
Patrick M. Guerin
中科院分区：
文献类型：
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作者：
P. Guerenstein;Patrick M. Guerin
五龄Triatoma infestans触角上的锥形感器和凹槽钉感器对寄主气味的反应。主机气味提取物的气相色谱分析，再加上电生理记录从basiconic感器表明，壬醛是羊毛和鸡毛气味，刺激这种类型的感器中的一个受体的成分。类似的分析表明，异丁酸在兔气味是一种化学刺激剂的受体之一，在槽钉感器。醛受体对庚醛、辛醛和壬醛的反应高于其他脂肪醛，酸受体对异丁酸的反应高于其他短链支化和非支化酸。五龄红腹小蠹的行为反应。infestans在伺服层上的气流中对壬醛和异丁酸的反应表明，壬醛引起虫子的激活，而异丁酸引起逆风位移的增加，即气味调节的趋风性。这些化合物的二元混合物没有改善单独使用异丁酸获得的吸引力。对空气中不同量异丁酸的行为和电生理反应的比较表明，在引起槽钉感器中酸激发受体的发射率低至中度增加的浓度下获得吸引力，而在引起相对高的发射率（>40 Hz）的剂量下则没有吸引力。
Olfactory receptors in basiconic and grooved-peg sensilla on the antenna of fifth-instar Triatoma infestans nymphs respond to host odours. Gas chromatography analyses of host odour extracts coupled to electrophysiological recordings from basiconic sensillum receptors indicate that nonanal is a constituent of sheep wool and chicken feather odour that stimulates one of the receptors in this type of sensillum. Similar analyses revealed isobutyric acid in rabbit odour to be a chemostimulant for one of the receptors in grooved-peg sensilla. The response of the aldehyde receptor was higher to heptanal, octanal and nonanal than to other aliphatic aldehydes, and the response of the acid receptor was higher to isobutyric acid than to other short-chain branched and unbranched acids. The behavioural responses of fifth-instar T. infestans nymphs to nonanal and isobutyric acid in an air-stream on a servosphere indicate that, whereas nonanal causes activation of the bugs, isobutyric acid induces an increase in upwind displacement, i.e. odour-conditioned anemotaxis. Binary mixtures of these compounds did not improve the attraction obtained with isobutyric acid alone. A comparison of the behavioural and electrophysiological responses of the bugs to different amounts of isobutyric acid in air suggests that attraction is obtained at concentrations that causes low-to-moderate increases in the firing rate of the acid-excited receptor in the grooved-peg sensilla, whereas at a dose that evokes relatively high firing rates (>40 Hz) no attraction is obtained.