Systematic distribution of birefringent bodies in Rotifera and first evidence of their ultrastructure in Acyclus inquietus (Gnesiotrocha: Collothecaceae)

Systematic distribution of birefringent bodies in Rotifera and first evidence of their ultrastructure in Acyclus inquietus (Gnesiotrocha: Collothecaceae)
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轮虫中双折射体的系统分布及其在 Acyclus inquietus 中超微结构的首次证据(Gnesiotrocha:Collothecaceae)

DOI:
10.1007/s10750-018-3784-8
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发表时间:
2019
期刊:
影响因子:
2.6
通讯作者:
Wallace, Robert L.
Wallace, Robert L.
中科院分区:
生物学3区
文献类型:
--
作者:
Yang, Hui;Hochberg, Rick;Walsh, Elizabeth J.;Wallace, Robert L.

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轮虫体内的双折射结核已经被报道了超过世纪,并且经常被假设为能量来源。在这里,我们提供了最新的分布在总目的Gnesiotrocha和第一个数据,他们的超微结构。在Gnesiotrocha中,这些双折射体(BRB)已知来自至少10种Collothecaceae和14种Flosculariaceae,两者都包括无柄和无柄物种。在固着物种中,捕食者Acyclus inquietus包含一个单一的BRB,被描述为淀粉样。我们检查了A.用透射电子显微镜观察,发现BRB有一个不规则的,电子致密的边缘,围绕着一个斑点状的核心。核心大部分是无定形的,但包含许多非常小的电子致密点和薄的电子致密纤维;没有任何晶格的证据。肠腔含有较小的结石,可能是BRB代谢的结果。薄的上皮含有丰富的电子致密颗粒,但相对较少的细胞器。我们推测BRB是一种独特的细胞外糖原形式,在幼虫的扩散和变态中作为能量来源发挥作用。在成人A.当猎物不再可用时,BRB可以提供能量允许繁殖。
Small birefringent concretions have been reported in rotifers for over a century and often hypothesized as energy sources. Here, we provide an update on their distribution in superorder Gnesiotrocha and the first data on their ultrastructure. Within Gnesiotrocha, these birefringent bodies (BRB) are known from at least ten species of Collothecaceae and 14 species of Flosculariaceae, both of which include planktonic and sessile species. Among sessile species, the predatorAcyclus inquietuscontains a single BRB that has been described as starch-like. We examined larvae ofA. inquietuswith transmission electron microscopy and revealed the BRB to have an irregular, electron-dense margin that surrounds a speckled core. The core appears mostly amorphous, but contains numerous, very small electron-dense spots and thin electron-dense fibers; there is no evidence of any crystalline lattice. The intestinal lumen contains smaller concretions that are probably the result of BRB metabolism. The thin epithelium contains abundant electron-dense granules but relatively few organelles. We hypothesize that the BRB is a unique form of extracellular glycogen that functions as an energy source in larvae for their dispersal and metamorphosis. In adultA. inquietus, the BRB may provide energy permitting reproduction when prey are no longer available.
轮虫类:或称轮子动物,英国和外国的 / C. T. Hudson 着;
DOI: --
发表时间: --
期刊:
影响因子: --
作者:
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DOI: 10.1083/jcb.8.3.575
发表时间: 1960-12
期刊: The Journal of biophysical and biochemical cytology
影响因子: --
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无柄轮虫的幼虫变态
DOI: --
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发表时间: 2012
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影响因子: --
作者:
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DOI: --
发表时间: 1975
期刊:
影响因子: --
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