The ultrastructure of the integument and proventriculus in the raptorial rotifer Cupelopagis vorax (Monogononta: Collothecaceae: Atrochidae)
The ultrastructure of the integument and proventriculus in the raptorial rotifer Cupelopagis vorax (Monogononta: Collothecaceae: Atrochidae)
复制标题
猛禽轮虫Cupelopagis vorax（Monogononta：Collothecaceae：Atrochidae）的珠皮和腺胃的超微结构
DOI：
10.1111/ivb.12161
复制
发表时间：
2017
影响因子：
1.2
通讯作者：
Wallace, Robert L.
中科院分区：
文献类型：
--
作者：
Hochberg, Rick;Walsh, Elizabeth J.;Wallace, Robert L.
无柄轮虫Cupelopagis vorax是一种不寻常的伏击捕食者，它们永久地附着在水下淡水植物上。以前的光学显微镜研究揭示了这个物种的几个不寻常的特征，包括星状图案的外皮和称为前胃的扩张的前肠区域。在这项研究中，我们应用透射电子显微镜来探讨的珠被和前肠的超微结构，以确定他们如何不同于其他轮虫。我们的研究结果表明，珠被覆盖厚的糖萼和图案与结节，起源于胞质内层（ICL）内的合胞体表皮。ICL在合胞体内形成一个顶端层，电子致密，大部分是无定形的，并形成高达2.3 μm的结节;这些结节可能解释了外皮的图案外观，并且与在其他gnesiotrochan rotifers中发现的相似。基底细胞质是高度颗粒状的，包含两种类型的膜结合囊泡：具有无定形、不透明内容物的大卵形囊泡（320-411 nm）和具有电子透明核心和偶尔电子致密内容物的分泌球（110-264 nm）。只有分泌球被观察到形成连接顶端质膜，所以可能是胞吐。在内部，前胃是一个大的可扩张的囊，连接前咽管和后乳突。腺室上皮是一个薄的合胞体，大部分覆盖着致密的糖萼，下面是一个薄的终末网。细胞质含有很少的细胞器，并且没有证据表明它是分泌的或具有特征（例如，ICL），这可能有助于浸渍。我们推测，厚glycocalyx可能起到保护作用，对运动的活猎物和/或对酶释放的轮虫的胃腺，在喂养过程中成为reproditated。
Members of the sessile rotifer speciesCupelopagis voraxare unusual ambush predators that live permanently attached to submerged freshwater plants. Previous light microscopical research has revealed several uncommon features in this species including a stellate‐patterned integument and an expansive foregut region called the proventriculus. In this study, we apply transmission electron microscopy to explore the ultrastructure of both the integument and foregut to determine how they differ from other rotifers. Our results reveal that the integument is covered by a thick glycocalyx and is patterned with tubercles that originate from the intracytoplasmic lamina (ICL) within the syncytial epidermis. The ICL forms an apical layer within the syncytium, is electron dense and mostly amorphous, and forms tubercles up to 2.3 μm; these tubercles probably account for the patterned appearance of the integument and are similar to what has been found in other gnesiotrochan rotifers. The basal cytoplasm is highly granular and contains two types of membrane‐bound vesicles: large ovoid vesicles (320–411 nm) with amorphous, opaque contents, and secretory bulbs (110–264 nm) with electron‐lucent cores and occasionally electron‐dense contents. Only the secretory bulbs were observed to form connections to the apical plasmalemma, and so are probably exocytotic. Internally, the proventriculus is a large distensible sack that connects the anterior pharyngeal tube to the posterior mastax. The proventricular epithelium is a thin syncytium mostly covered with a dense glycocalyx and a strong brush border of microvilli underlain by a thin terminal web. The cytoplasm contains few organelles and there is no evidence that it is either secretory or has features (e.g., ICL) that might aid in maceration. We hypothesize that the thick glycocalyx might serve a protective function against the movements of live prey and/or against enzymes released from the rotifer's gastric glands that become regurgitated during feeding.
登录
查看更多内容
无柄轮虫的幼虫变态
影响因子：
2.6
作者：
L. Kutikova
通讯作者：
L. Kutikova
轮虫Habrotrocha rosa Donner (Aschelminthes)外皮超微结构的研究
影响因子：
3.6
作者：
U. Schramm
通讯作者：
U. Schramm
DOI：
--
发表时间：
1966
期刊：
影响因子：
--
作者：
J. Koehler
通讯作者：
J. Koehler
轮虫外皮的超微结构：Sinantherina Socialis（Monogononta：Gnesiotrocha）的特性
影响因子：
1.2
作者：
Hochberg, Rick;Hochberg, Adele;Chan, Courtney
通讯作者：
Chan, Courtney
凯尔盖勒尼科 (Kergueleniidae) 科。
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
J. Lowry;H. Stoddart
通讯作者：
H. Stoddart