Ultrastructure of Trimastix pyriformis (Klebs) Bernard et at.:: Similarities of Trimastix species with retortamonad and jakobid flagellates
Ultrastructure of Trimastix pyriformis (Klebs) Bernard et at.:: Similarities of Trimastix species with retortamonad and jakobid flagellates
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DOI：
10.1016/s1434-4610(99)70018-0
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发表时间：
1999-08-01
期刊：
影响因子：
2.5
通讯作者：
Nerad, TA
中科院分区：
文献类型：
--
作者：
O'Kelly, CJ;Farmer, MA;Nerad, TA
梨形Trimastix pyriformis (Klebs 1893) Bernard et al, 1999，是一种来自缺乏线粒体的缺氧淡水的四鞭毛虫，自由生活，嗜菌异养纳米鞭毛虫。该物种的单原生培养物含有裸露的营养细胞，具有前鞭毛插入和明显的腹沟。细菌在腹沟后端被摄入，但没有持久的细胞咽复合体。后鞭毛位于这个沟中，有两个突出的叶片。鞭毛止点附近有高尔基体（双染色体体）。动质由4个基体、4个微管根和相关的纤维和带组成。在开放的有丝分裂纺锤体的两极出现了重复的分裂体，每个分裂体有四个基体和微管根模板。梨形Trimastix与其他Trimastix物种的区别在于其外部形态、动体结构和内膜分布。Trimastix的种类与jakobid鞭毛虫，尤其是jakobiformmalawimonas，以及Chilomastix的变种最为相似。还原单胞菌可能是通过失去“典型”（在电子显微镜下很容易看到）的内膜系统和与细胞壁/细胞咽复合体相关的细胞骨架元件而从类似trimasix的祖先进化而来的。
Trimastix pyriformis (Klebs 1893) Bernard et al, 1999, is a quadriflagellate, free-living, bacterivorous heterotrophic nanoflagellate from anoxic freshwaters that lacks mitochondria. Monoprotist cultures of this species contained naked trophic cells with anterior flagellar insertion and a conspicuous ventral groove. Bacteria were ingested at the posterior end of the ventral groove, but there was no persistent cytopharyngeal complex. The posterior flagellum resided in this groove, and bore two prominent vanes. A Golgi body (dictyosome) was present adjacent to the flagellar insertion. The kinetid consisted of four basal bodies, four microtubular roots, and associated fibers and bands. Duplicated kinetids, each with four basal bodies and microtubular root templates, appeared at the poles of the open mitotic spindle. Trimastix pyriformis is distinguishable from other Trimastix species on the basis of external morphology, kinetid architecture and the distribution of endomembranes. Trimastix species are most similar to jakobid flagellates, especially Malawimonas jakobiformis, and to species of the retortamonad genus Chilomastix. Retortamonads may have evolved from a Trimastix-like ancestor through loss of "canonical" (easily seen with electron microscopy) endomembrane systems and elaboration of cytoskeletal elements associated with the cytostome/cytopharynx complex.