Electron Microscopic Localization of ATPase Activity in the Cytopharyngeal Basket of the Ciliate Pseudomicrothorax dubius

Hauser, Manfred; Hausmann, Klaus

doi:10.1111/j.1432-0436.1982.tb01227.x

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…They have a cytopharyngeal basket adapted for attachment, ingestion and cutting long filaments (Hausman & Peck 1979 ;Peck 1985). The structure and function of the cytopharyngeal basket in some strains of assula (Tucker 1968) and Pseudomicrothorax dubius (Hausmann & Peck 1978 ;Hauser & Hausmann 1982) have been described in detail.…”

Section: Introductionmentioning

confidence: 99%

Inducible defence against a ciliate grazerPseudomicrothorax dubius, in two strains ofPhormidium(cyanobacteria)

Fiałkowska

Pajdak‐Stós

1997

Proc. R. Soc. Lond. B

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Experiments were done with two strain of filamentous, mat-forming Phormidium and their ciliate grazer Pseudomicrothorax dubius, to explain why the ciliates remain hungry in an apparent surplus of food, except for the first 24 hours after feeding. Under grazing pressure, both strains of cyanobacteria showed statistically significant increases in the number of filaments terminating in an empty sheath, compared to the control. Direct observations revealed that the mechanism behind this effect was active withdrawal of the trichomes inside the sheaths when disturbed by grazers. As P. dubius is unable to ingest trichomes with such endings, we conclude that cyanobacteria are not limited to chemical means of defence against grazers but can also defend themselves by means of movement and changes in filament morphology. This is apparently the first report on behavioural defence observed in cyanobacteria.

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Section: Introductionmentioning

confidence: 99%

Inducible defence against a ciliate grazerPseudomicrothorax dubius, in two strains ofPhormidium(cyanobacteria)

Fiałkowska

Pajdak‐Stós

1997

Proc. R. Soc. Lond. B

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“…while types I and 111 occur in other ciliate orders (5,32). The function of microtubule ribbons is probably guidance and transport of food during ingestion (24)(25)(26)(43)(44)(45) and their role in the ophryoscolecids is discussed elsewhere (1 [8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Resultsmentioning

confidence: 99%

The Functional and Evolutionary Significance of the Ultrastructure of the Ophryoscolecidae (Order Entodiniomorphida)¹

Furness

Butler

1988

The Journal of Protozoology

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ABSTRACT. Ophryoscolecid ciliates from the order Entodiniomorphida show a series of morphological types which have been interpreted as an evolutionary lineage. In this study, ultrastructural information from three species—the ancestral Entodinium, intermediate Eudiplodinium maggii, and the advanced Epidinium—has been evaluated in terms of ophryoscolecid evolution. The infraciliature, nuclei, contractile vacuoles, cortex, and cytoplasm are all very similar and sometimes indistinguishable among the three species, suggesting a close relationship. The cytoalimentary system, however, shows considerable interspecific variation. The cytopharynx differs in position and extent of microtubules and microfilaments, varying in appearance from a microtubular to a microfilament‐based mechanism while retaining similar component structures. The esophagus, a zone of cytoplasm extending from the cytopharynx and delimited by a microtubular/fibrillar wall, is rudimentary in Entodinium, sac‐like in Eudiplodinium, and tube‐like in Epidinium, where it also has convoluted walls and a sheath of fibrous material that suggest an expansible‐contractile structure. These variations have been related to type of food particle ingested. The capability of the cytoalimentary systems seems to be increased so that the more advanced forms can exploit a food resource, in the form of large plant fragments in the ruminal fluid, not available to the simpler, ancestral forms, which tend to ingest small particles such as bacteria and starch grains. The original evolutionary lineage based on morphological studies using light microscopy is supported by our observations, in these three forms, of ultrastructural variations in the cytopharynx and in their relationship with diet via possible ingestion mechanisms. Additional support for this evolutionary analysis comes from preliminary studies of other ophryoscolecids in which the cytoalimentary organization is consistent with their positions relative to one another in the evolutionary scheme.

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Spatially separated classes of microtubule bridges in the reticulopodial network of Allogromia

Golz

Hauser

1994

European Journal of Protistology

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Electron Microscopic Localization of ATPase Activity in the Cytopharyngeal Basket of the Ciliate Pseudomicrothorax dubius

Cited by 5 publications

References 16 publications

Inducible defence against a ciliate grazerPseudomicrothorax dubius, in two strains ofPhormidium(cyanobacteria)

Inducible defence against a ciliate grazerPseudomicrothorax dubius, in two strains ofPhormidium(cyanobacteria)

The Functional and Evolutionary Significance of the Ultrastructure of the Ophryoscolecidae (Order Entodiniomorphida)¹

Spatially separated classes of microtubule bridges in the reticulopodial network of Allogromia

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Electron Microscopic Localization of ATPase Activity in the Cytopharyngeal Basket of the Ciliate Pseudomicrothorax dubius

Cited by 5 publications

References 16 publications

Inducible defence against a ciliate grazerPseudomicrothorax dubius, in two strains ofPhormidium(cyanobacteria)

Inducible defence against a ciliate grazerPseudomicrothorax dubius, in two strains ofPhormidium(cyanobacteria)

The Functional and Evolutionary Significance of the Ultrastructure of the Ophryoscolecidae (Order Entodiniomorphida)1

Spatially separated classes of microtubule bridges in the reticulopodial network of Allogromia

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The Functional and Evolutionary Significance of the Ultrastructure of the Ophryoscolecidae (Order Entodiniomorphida)¹