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首页> 外文期刊>Open access Insect Physiology >Distribution of mechanoreceptive sensilla and their functions in the defensive behavior of tenebrionid beetle pupae
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Distribution of mechanoreceptive sensilla and their functions in the defensive behavior of tenebrionid beetle pupae

机译：机械感受性感受器的分布及其在ten虫的防御行为中的作用

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Background: Pupae of the tenebrionid beetles exhibit different defensive behaviors in response to tactile stimulation of different parts of their bodies. Little is known about the mechanosensory mechanisms that initiate these defensive behaviors. To understand the mechanisms, we examined the distribution and function of the mechanoreceptive sensilla on the pupal body of Zophobas atratus.Methods: The sensilla on the surface of the pupal cuticle were observed using light and scanning electron microscopy. The tactile sensitivity of various parts of the pupal body was tested using three probes with different bending forces. The function of particular sensilla was examined by stimulating them electrically.Results: Hair (trichoid) sensilla were classified according to their length, ie, long hair sensilla (80–200 μm) were mostly located on the lateral regions of each body segment and short hairs (5–50 μm) were distributed across almost the entire surface of the pupal body, except for the elytra and intersegmental membrane of the abdomen. In addition to the trichoid sensilla, almost all parts of the pupal body, including the elytra and the intersegmental membrane, had campaniform sensilla (CS) with a dome-like structure in the cuticular layer; these sensilla detected strains in the cuticle. The CS were concentrated on the articulation of segmented appendages and the lateral region of the intersegmental membrane. The defensive response (abdominal rotation) to electrical stimulation was greatly reduced when afferent nerves from CS clustered on the apical region of the tarsus were transected.Conclusion: CS may be responsible for the high sensitivity of pupal appendages to tactile stimuli. The CS located on the appendages and abdominal intersegmental membrane may trigger specific and effective defensive behaviors. Both types of mechanoreceptive sensilla may enable pupal perception of the external environment, including the location of potentially harmful stimuli, and are involved in the control of defensive posture and movement.
机译：背景：br虫的P表现出不同的防御行为，以响应其身体不同部位的触觉刺激。关于引发这些防御行为的机械感官机制知之甚少。为了了解其机理，我们研究了机械感受器在小生虫的Z体中的分布和功能。方法：使用光和扫描电镜观察observed表皮表面的感觉。使用三个具有不同弯曲力的探头测试了body体各个部位的触觉灵敏度。结果：头发（长毛）感官根据其长度进行分类，即长发感官（80–200μm）主要位于每个身体部位的外侧区域，短发毛（5–50μm）几乎遍布up体的整个表面，腹部的鞘翅和节间膜除外。除毛状脉络膜感器外，almost体的几乎所有部位，包括鞘翅和节间膜，在表皮层都具有带圆顶状结构的坎帕尼样感器（CS）。这些感官检测到角质层中的菌株。 CS集中于节段性附件的关节和节间膜的外侧区域。切断CS聚集在the节顶端区域的传入神经后，对电刺激的防御反应（腹部旋转）大大降低。结论：CS可能是of附属物对触觉刺激的高度敏感性。位于附肢和腹部节间膜上的CS可能触发特定和有效的防御行为。两种类型的机械感受器均可使may感知外部环境，包括潜在有害刺激的位置，并且参与防御姿势和运动的控制。

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