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首页> 外文期刊>Zoological Science >Morphology of the digestive system in the wood-feeding termiteNasutitermes takasagoensis (Shiraki) [Isoptera : Termitidae]
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Morphology of the digestive system in the wood-feeding termiteNasutitermes takasagoensis (Shiraki) [Isoptera : Termitidae]

机译：以木材为食的白蚁Nasutitermes takasagoensis（Shiraki）消化系统的形态[等翅目：mit科]

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摘要

The morphologies of epithelial cells throughout the alimentary canal of the wood-feeding termite Nasutitermes takasagoensis (Shiraki) were examined. The digestive tract consists of four principal portions, which are the foregut, the midgut, the mixed segment and the hindgut. The midgut epithelium is primarily composed of columnar cells and degenerative cells. Most columnar cells have one or more autophagic vacuoles at cell apexes, suggesting a rapid turnover of the midgut cells. In the mixed segment, the mesenteric epithelium occupies half of the gut wall and the proctodeal epithelium covers the remaining wall. Extensive invaginations of the basal membrane are characteristic of the mesenteric columnar cells, suggesting active transport of an ionic fluid. The hindgut can be divided into five segments, the first of which is a simple tube lined with a thick cuticle, termed the first proctodeal segment. The epithelium of the third segment, the paunch, consists of cuboidal cells, which are covered by multiple cuticular layers. The apical membrane of these epithelial cells forms regular invaginations, suggesting that they have an absorptive function. In the anterior paunch, numerous spirochetes are found adhered to the gut wall. Our observations indicate that termites such as N. takasagoensis appear to have developed structures that enable more efficient interactions with intestinal microorganisms, particularly by the elongation and differentiation of the hindgut and the creation of the mixed segment.
机译：检查了以木材为食的白蚁Nasutitermes takasagoensis（Shiraki）的整个消化道中上皮细胞的形态。消化道由四个主要部分组成，分别是前肠，中肠，混合部分和后肠。中肠上皮细胞主要由柱状细胞和变性细胞组成。大多数柱状细胞在细胞顶点具有一个或多个自噬泡，表明中肠细胞快速周转。在混合节段中，肠系膜上皮占据肠壁的一半，而直肠上皮覆盖其余的壁。肠系膜柱状细胞的特征是基底膜的广泛内陷，提示离子液体的主动转运。后肠可分为五个部分，第一个是简单的内衬厚表皮的管，称为第一个直肠前段。第三节的上皮，即下颌，由长方体细胞组成，被多个表皮层覆盖。这些上皮细胞的顶膜形成规则的内陷，表明它们具有吸收功能。在前刺中，发现许多螺旋体附着在肠壁上。我们的观察表明，白蚁（如高砂猪笼草）似乎具有发达的结构，能够与肠道微生物进行更有效的相互作用，特别是通过后肠的延伸和分化以及混合节段的形成。

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