On the fine structure of the cell walls in the genus Closterium (Desmidiaceae) with special reference to the pore system

Mix, Marianne

doi:10.1007/bf00408857

Cited by 26 publications

(5 citation statements)

References 8 publications

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“…The lack of pores in the cell wall of Netrium indicates that mucilage is excreted directly through the cell wall, which, despite the presence of pores, has been also found in Micrasterias (Oertel et al 2004 ). The same holds for the related algae Penium and Closterium which both reveal pore-like structures only in the outer cell-wall layer (Domozych and Rogers-Domozych 2007 ; Mix 1969 , 1972 , 1975 ). The similarity of Netrium with other basic desmids in its mode of cell division but its different cell wall structure strengthens the theory based on morphological (Mix 1975 ) and molecular data (Gontcharov et al 2003 ; McCourt et al 2000 ), suggesting an intermediate position of Netrium between saccoderm and placoderm desmids.…”

Section: Discussionmentioning

confidence: 54%

Analyses and localization of pectin-like carbohydrates in cell wall and mucilage of the green alga Netrium digitus

Eder

Lütz‐Meindl

2009

Protoplasma

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The unicellular, simply shaped desmid Netrium digitus inhabiting acid bog ponds grows in two phases. Prior to division, the cell elongates at its central zone, whereas in a second phase, polar tip growth occurs. Electron microscopy demonstrates that Netrium is surrounded by a morphologically homogeneous cell wall, which lacks pores. Immunocytochemical and biochemical analyses give insight into physical wall properties and, thus, into adaptation to the extreme environment. The monoclonal antibodies JIM5 and JIM7 directed against pectic epitopes with different degrees of esterification label preferentially growing wall zones in Netrium. In contrast, 2F4 marks the cell wall only after experimental de-esterification. Electron energy loss spectroscopy reveals Ca-binding capacities of pectins and gives indirect evidence for the degree of their esterification. An antibody raised against Netrium mucilage is not only specific to mucilage but also recognizes wall components in transmission electron microscopy and dot blots. These results indicate a smooth transition between mucilage and the cell wall in Netrium.

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Section: Discussionmentioning

confidence: 54%

Analyses and localization of pectin-like carbohydrates in cell wall and mucilage of the green alga Netrium digitus

Eder

Lütz‐Meindl

2009

Protoplasma

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“…The different ultrastructure of Closterium and Cosmarium pores has already been described (Mix 1969;PICKETT-HEAPS 1972;NEUHAUS et al 1981). …”

Section: Resultsmentioning

confidence: 85%

An Ultrastructural and Cytochemical Study on Conjugatophycean Cell Wall

Cheli

Vecchi

1989

Caryologia

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SUMMARY -A cytochemical study was carried out to investigate the composition of the extracellular matrices in different species of unicellular and filamentous Conjugatophyceae. The study allowed us to determine the distribution and the precise localization, at the ultrastructural level, of different groups of chemical components. There were clear differences between unicellular and filamentous species, as regards the kind of cell wall texture, the structure and architecture of the external mucilaginous sheath, and the distribution and localization of chemical components within it. The same cytochemical techniques were used to investigate the behavior of extracellular envelopes during the conjugation process only in Spirogyra. These layers underwent extensive modifications during conjugation: the mucilaginous sheath disappeared and glycoproteinaceous material was accumulated in the cell wall of the forming conjugation papilla.

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“…Comparable multilayered cell walls, some with preserved TLS, are recognized in leiosphaerids and are suggested to show developmental stages and various generations among ancient microbiota (Moczydlowska et al, 2009). The deposition of secondary wall layers and formation of three-layered cell walls in morphogenesis of the resting stages occur in a similar way in other algal orders [i.e., the Zygnematales (Mix, 1969;Pickett-Heaps, 1972], and thus does not preclude possible alternative affinities.…”

Section: E V E L O P M E N T a L S T A G E S L I F E C Y C L E A mentioning

confidence: 95%

Life cycle of Early Cambrian microalgae from theSkiagia-plexus acritarchs

Moczydłowska

2010

J. Paleontol.

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ABSTRACT-Light microscopy studies on new materials and museum collections of early Cambrian organic-walled microfossils, informally called acritarchs, provide the observations on phenetic features that permit a comparison to certain Modern microalgae and the recognition of various developmental stages in their life cycle. The microfossils derive from various depositional settings in Estonia, Australia, Greenland, Sweden, and Poland. The exceptionally preserved microfossils reveal the internal body within the vesicle, the endocyst, and the process of releasing the endocyst from the cyst. Vegetative cells, cysts, and endocysts are distinguished, and the hypothetical reconstruction of a complex life cycle with the alternation of sexual and asexual generations is proposed. Acritarchs from the Skiagia-plexus are cysts, and likely zygotes in the sexual generation, which periodically rested as ''benthic plankton.'' Some microfossils of the Leiosphaeridia-plexus that are inferred to be vegetative cells were planktonic and probably haplobiontic. These form-taxa may belong to a single biological species, or a few closely related species, and represent the developmental stages and alternating generations in a complex life cycle that is expressed by polymorphic, sphaero-and acanthomorphic acritarchs. The morphological resemblance and diagnostic cell wall ultrastructure with the trilaminar sheath structure known from earlier studies suggest that the early Cambrian microfossils are the ancestral representatives and/or early lineages to the Modern class Chlorophyceae and the orders Volvocales and Chlorococcales.

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On the fine structure of the cell walls in the genus Closterium (Desmidiaceae) with special reference to the pore system

Cited by 26 publications

References 8 publications

Analyses and localization of pectin-like carbohydrates in cell wall and mucilage of the green alga Netrium digitus

Analyses and localization of pectin-like carbohydrates in cell wall and mucilage of the green alga Netrium digitus

An Ultrastructural and Cytochemical Study on Conjugatophycean Cell Wall

Life cycle of Early Cambrian microalgae from theSkiagia-plexus acritarchs

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