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. 2018 Mar 6;9(2):e02447-17. doi: 10.1128/mBio.02447-17

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Copyright © 2018 Tashyreva et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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FIG 7 — Scanning (A, B) and transmission (C to L) electron micrographs of trophic D. japonicum. (A) General appearance of the cell. Note the protruding cytoskeletal microtubules that follow the helix path (arrowheads). (B) Anterior part of the cell. Note the protruding cytoskeletal microtubules near the cytostome (arrowhead). (C) Longitudinally sectioned cell illustrating the main ultrastructural features. (D) Transversely sectioned cell. (E) Tangential section showing an elaborate array of microtubules that follow the helical path along the length of the cytoskeleton. (F) Cross-sectioned endosymbiotic bacterium. Note the double membrane, periplasm, and homogeneous granular interior. (G) Longitudinal profile of a hornlike cytopharynx. The ribs that constitute the cytopharynx appear as a series of longitudinally oriented, electron-dense lines. (H) Cross-sectioned cytopharynx in a region of the cytostome showing a series of five ribs and supporting rods made of clusters of microtubules and fibrous material. Note the row of longitudinally oriented microtubules in close proximity to reinforcing and cytoskeletal microtubules (asterisk). (I) Cross-sectioned proximal end of the cytopharynx. A row of longitudinally oriented microtubules become associated with the rods and ribs. Longitudinally sectioned flagellar pocket. Parallel basal bodies are associated with intermediate and ventral roots. Note the reinforcing microtubules and gap of cytoskeletal microtubules in the flagellar attachment zone. Arrows indicate distal (black) and proximal (white) transitional plates. (K) Transverse section of a flagellum covered with fine hairs. The paraflagellar rod is absent. (L) Cross section through the extension underneath the flagellar pocket, where a band of reinforcing microtubules originates. Abbreviations: Ap, apical papilla; B, basal body; C, cytostome; ch, chromatin; cr, mitochondrial cristae; ER, endoplasmic reticulum; F, flagellum; Fa, feeding apparatus; Fp, flagellar pocket; G, Golgi apparatus; ir, intermediate root; L, phagolysosome-like body; M, mitochondrion; m, microtubules; MTR, reinforcing microtubules; N, nucleus; n, nucleolus; P, cytopharynx; pm, plasma membrane; R, rib; r, supporting rod; S, endosymbiont; V, vacuole; vr, ventral root. Scale bars: 1 µm (A to D, G), 0.2 µm (E, F, H to J), and 0.1 µm (K, L).