低放射密度μCT扫描显示白蚁腿及其亚属器官的详细形态

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2022-09-01 DOI:10.1016/j.asd.2022.101191
Travers M. Sansom , Sebastian Oberst , Adrian Richter , Joseph C.S. Lai , Mohammad Saadatfar , Manuela Nowotny , Theodore A. Evans
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引用次数: 0

摘要

白蚁通过位于其腿胫骨内的亚属器官(SGOs)感知微小的底物传播振动。人们对sgo的结构和物理性质知之甚少。我们采用高分辨率(体素大小0.45 μm)微计算机断层扫描(μCT)对澳大利亚白蚁,Coptotermes lacteus和Nasutitermes exitiosus (Hill)进行了两种染色技术的测试。我们比较了Lugol’s碘溶液(LS)和LS之后的磷钨酸(PTA)溶液(1%和2%)的染色效果。然后,我们展示了一群埃及纳乌白蚁(Nasutitermes exitiosus)的结果,将μCT与LS + 2%PTS染色和扫描电镜相结合,以举例说明其sgo的可视化。由于其近似椭圆形的形状,白蚁的SGO最大直径为60 μm,最小直径为48 μm,覆盖了60±4%的腿横截面和90.4±5%的残留血淋巴通道。此外,腿部和残余血淋巴通道的横截面积在SGO周围分别减少了33%和73%。我们假设这种横截面积的变化放大了SGO的振动。由于sgo直接与角质层相连,因此它们的机械特性和几何细节可以为确定白蚁如何感知微振动提供新的方法。
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Low radiodensity μCT scans to reveal detailed morphology of the termite leg and its subgenual organ

Termites sense tiny substrate-borne vibrations through subgenual organs (SGOs) located within their legs' tibiae. Little is known about the SGOs' structure and physical properties. We applied high-resolution (voxel size 0.45 μm) micro-computed tomography (μCT) to Australian termites, Coptotermes lacteus and Nasutitermes exitiosus (Hill) to test two staining techniques. We compared the effectiveness of a single stain of Lugol's iodine solution (LS) to LS followed by Phosphotungstic acid (PTA) solutions (1% and 2%). We then present results of a soldier of Nasutitermes exitiosus combining μCT with LS + 2%PTS stains and scanning electron microscopy to exemplify the visualisation of their SGOs. The termite's SGO due to its approximately oval shape was shown to have a maximum diameter of 60 μm and a minimum of 48 μm, covering 60 ± 4% of the leg's cross-section and 90.4 ± 5% of the residual haemolymph channel. Additionally, the leg and residual haemolymph channel cross-sectional area decreased around the SGO by 33% and 73%, respectively. We hypothesise that this change in cross-sectional area amplifies the vibrations for the SGO. Since SGOs are directly connected to the cuticle, their mechanical properties and the geometric details identified here may enable new approaches to determine how termites sense micro-vibrations.

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来源期刊
CiteScore
3.50
自引率
10.00%
发文量
54
审稿时长
60 days
期刊介绍: Arthropod Structure & Development is a Journal of Arthropod Structural Biology, Development, and Functional Morphology; it considers manuscripts that deal with micro- and neuroanatomy, development, biomechanics, organogenesis in particular under comparative and evolutionary aspects but not merely taxonomic papers. The aim of the journal is to publish papers in the areas of functional and comparative anatomy and development, with an emphasis on the role of cellular organization in organ function. The journal will also publish papers on organogenisis, embryonic and postembryonic development, and organ or tissue regeneration and repair. Manuscripts dealing with comparative and evolutionary aspects of microanatomy and development are encouraged.
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