Abundant Chitinous Structures in Chilostomella (Foraminifera, Rhizaria) and Their Potential Functions.
Abundant Chitinous Structures in Chilostomella (Foraminifera, Rhizaria) and Their Potential Functions.
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DOI：
10.1111/jeu.12828
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发表时间：
2021-01
期刊：
影响因子：
--
通讯作者：
Isobe N
中科院分区：
文献类型：
--
作者：
Nomaki H;Chen C;Oda K;Tsuchiya M;Tame A;Uematsu K;Isobe N
底栖有孔虫，Rhizaria的成员，栖息在广泛的海洋环境中，特别是在缺氧沉积物中。底栖有孔虫生物学是理解底栖生态系统和相关生物地球化学循环的关键，特别是在缺氧环境中。Chilostomella是一种常见于缺氧深海沉积物中的有孔虫属，其生态特征知之甚少。例如，它们的脂质的碳同位素组成与其他共存的属有很大不同，可能反映了其代谢的独特特征。在这里，我们研究了来自日本相模湾半深海沉积物的Chilostomella ovoidea的细胞质和超微结构特征，基于使用光学显微镜检查的连续半薄切片，然后进行三维重建，结合超薄切片的TEM观察。TEM观察显示存在大量电子致密结构，将细胞质分开。基于组织化学染色，这些结构被证明是由几丁质。我们的3D重建显示了最后七个腔室中的几丁质结构。这些在最终腔室中表现出板状形态，但在早期腔室中卷起（朝向前房）。这些几丁质的板状结构可能起到分隔室中细胞质的作用，以增加表面积/体积比和/或作为某些代谢功能的反应位点。
Benthic foraminifera, members of Rhizaria, inhabit a broad range of marine environments and are particularly common in hypoxic sediments. The biology of benthic foraminifera is key to understanding benthic ecosystems and relevant biogeochemical cycles, especially in hypoxic environments. Chilostomella is a foraminiferal genus commonly found in hypoxic deep‐sea sediments and has poorly understood ecological characteristics. For example, the carbon isotopic compositions of their lipids are substantially different from other co‐occurring genera, probably reflecting unique features of its metabolism. Here, we investigated the cytoplasmic and ultrastructural features of Chilostomella ovoidea from bathyal sediments of Sagami Bay, Japan, based on serial semi‐thin sections examined using an optical microscope followed by a three‐dimensional reconstruction, combined with TEM observations of ultra‐thin sections. Observations by TEM revealed the presence of abundant electron‐dense structures dividing the cytoplasm. Based on histochemical staining, these structures are shown to be composed of chitin. Our 3D reconstruction revealed chitinous structures in the final seven chambers. These exhibited a plate‐like morphology in the final chambers but became rolled up in earlier chambers (toward the proloculus). These chitinous, plate‐like structures may function to partition the cytoplasm in a chamber to increase the surface/volume ratio and/or act as a reactive site for some metabolic functions.
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DOI：
10.1023/a:1015222607996
发表时间：
2002-01-01
影响因子：
3.3
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