The ultrastructural investigation of the midgut in the quill mite Syringophilopsis fringilla (Acari, Trombidiformes: Syringophilidae)
The ultrastructural investigation of the midgut in the quill mite Syringophilopsis fringilla (Acari, Trombidiformes: Syringophilidae)
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DOI：
10.1016/j.asd.2009.01.002
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发表时间：
2009-07-01
影响因子：
2
通讯作者：
Filimonova, S. A.
中科院分区：
文献类型：
--
作者：
Filimonova, S. A.
本文采用光镜和透射电镜对雌性毛羽丁香（Syringophilopsis fringilla, Fritsch）由前中肠和后中肠组成的中肠进行了研究。前中肠包括脑室和两对中肠盲肠。这些器官除毗邻臀腺的区域外，均有类似的上皮排列。前中肠上皮细胞分为四种亚型。它们都明显地代表了一种细胞类型的生理状态。消化细胞最多。这些细胞富含粗内质网，参与分泌和细胞内消化。它们在顶端区域形成巨噬细胞囊泡，在中央细胞质形成大量的次生溶酶体。消化细胞在积累各种残体和球体后，转化为排泄细胞。后者可以挤进肠腔或从其顶端区域芽出并进入一个新的消化循环。在所有检查的标本中均未发现分泌细胞。它们的特点是存在致密的膜结合颗粒，直径2-4 pm，以及广泛的粗糙内质网和高尔基体。靠近尾腺的脑室壁显示上皮细胞运输的特征。细胞的特点是顶端突起分叉不规则，线粒体浓度高。排泄器官（后中肠）的主要功能是排除含氮废物。在上皮细胞的细胞质中形成含鸟嘌呤颗粒被证明与高尔基体活性有关。排泄颗粒通过内分泌或大汗液分泌进入肠腔。定期排出粪便团块。在前中肠上皮细胞中偶见有丝分裂象。2009爱思唯尔有限公司版权所有。
The midgut of the females of Syringophilopsis fringilla (Fritsch) composed of anterior midgut and excretory organ (=posterior midgut) was investigated by means of light and transmission electron microscopy. The anterior midgut includes the ventriculus and two pairs of midgut caeca. These organs are lined by a similar epithelium except for the region adjacent to the coxal glands. Four cell subtypes were distinguished in the epithelium of the anterior midgut. All of them evidently represent physiological states of a single cell type. The digestive cells are most abundant. These cells are rich in rough endoplasmic reticulum and participate both in secretion and intracellular digestion. They form macropinocytotic vesicles in the apical region and a lot of secondary lysosomes in the central cytoplasm. After accumulating various residual bodies and spherites, the digestive cells transform into the excretory cells. The latter can be either extruded into the gut lumen or bud off their apical region and enter a new digestive cycle. The secretory cells were not found in all specimens examined. They are characterized by the presence of dense membrane-bounded granules, 2-4 pm in diameter, as well as by an extensive rough endoplasmic reticulum and Golgi bodies. The ventricular wall adjacent to the coxal glands demonstrates features of transporting epithelia. The cells are characterized by irregularly branched apical processes and a high concentration of mitochondria. The main function of the excretory organ (posterior midgut) is the elimination of nitrogenous waste. Formation of guanine-containing granules in the cytoplasm of the epithelial cells was shown to be associated with Golgi activity. The excretory granules are released into the gut lumen by means of eccrine or apocrine secretion. Evacuation of the fecal masses occurs periodically. Mitotic figures have been observed occasionally in the epithelial cells of the anterior midgut. (C) 2009 Elsevier Ltd. All rights reserved.