Structure and significance of cruciate flagellar root systems in green algae: Zoospores ofUlva lactuca (Ulvales, Chlorophyceae)

Melkonian, Michael

doi:10.1007/bf02277986

Cited by 49 publications

(46 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two pairs of basal bodies, upper and lower pairs, lie at obviously different levels in the papilla. A similar disposition is also found in the zoospores of Enteromorpha intestinalis (L.) Link (Stuessy et al 1983), Entodadia viridis Reinke (O'Kelly and Floyd 1983) and probably Ulva lactuca L. (Melkonian 1979b), but the upper pair is located only slightly anterior to the lower pair in these algae.…”

Section: Discussionmentioning

confidence: 60%

Flagellar Apparatus of the Quadriflagellated Zoospore of Chaetomorpha spiralis Okamura (Cladophorales, Chlorophyta)

Hirayama¹,

Hori²

1984

Botm

View full text Add to dashboard Cite

The flagellar apparatus of the quadriflagellate zoospores of the marine cladophoralean alga, Chaetomorpha spiralis Okamura, was compared with that of other green algae. There is a general similarity, with some important differences, to the Ulvales and siphonous green algae so far studied. Common features are the presence of a cruciate root System (4-2-4-2 type), basal body overlap, the presence of terminal caps and displacement of the upper pair of the basal bodies and four microtubular roots. On the basis of these features, it is concluded that the taxonomic affinities of C. spiralis lie with the Ulvophyceae sensu Stewart and Mattox rather than with the Chlorophyceae sensu Stewart and Mattox.In this alga two pairs of basal bodies He at obviously different levels. Basal bodies of the upper pair are disposed relevant to each other in the 11/5 o'clock direction (counter-clockwise orientation), whereas basal bodies of the Iower pair are in the 1/7 o'clock direction (clockwise orientation). We discuss the terminology of the arrangements of the flagellar apparatus components.Characteristics of the striped fibres which connect the X-membered roots to basal bodies are also discussed and this is given the name "X-membered root associated striped band (XSB)" to distinguish it from the rhizoplast-type System II fibres.

show abstract

Section: Discussionmentioning

confidence: 60%

Flagellar Apparatus of the Quadriflagellated Zoospore of Chaetomorpha spiralis Okamura (Cladophorales, Chlorophyta)

Hirayama¹,

Hori²

1984

Botm

View full text Add to dashboard Cite

show abstract

“…(a Based on Ettl, 1976;b on Ringo, 1967b on Ringo, ) et al, 1980Hoffmann, 1984;Melkonian, 1977Melkonian, , 1978Melkonian, , 1983Moestrup, 1978Moestrup, , 1982. Bakker & Lokhorst, 1985;Floyd et al, 1985;Gori, 1979;Hirayama & Hori, 1984;Hoops et al, 1982;Hold, 1977;Hori & Kobara, 1982;J6nsson & Chesnoy, 1984;Lokhorst, 1984;Melkonian, 1979Melkonian, , 1980Melkonian, , 1981bMiyaji & Hori, 1984;O'Kelly et al, 1984;Roberts et al, 1980Roberts et al, , 1981Sluiman, 1985b;Sluiman et al, 1980bSluiman et al, , 1982Stuessy et al, 1983). This flagellate cell type is characteristic of the class Ulvophyceae.…”

Section: Architecture Of the Flageflate Cellmentioning

confidence: 97%

The emergence of a new chlorophytan system, and Dr. Kornmann's contribution thereto

Hoek

Stam

Olsen

1988

Helgolander Meeresunters

View full text Add to dashboard Cite

In traditional chlorophytan systems the organizational level was the primary character for the distinction of main groups (classes and orders). For instance, in Fott (1971), the flagellate level corresponds with the Volvocales, the coccoid level with the Chlorococcales, the filamentous level with the Ulotrichales, the siphonocladous level with the Siphonocladales, and the siphonous level with the Bryopsidales. The new system presented here is an elaboration and emendation of recently proposed taxonomies and their underlying phylogenetic hypotheses, and it is mainly based on ultrastructural features which have become available over the last 15 years. The following criteria are used for the distinction of classes and orders: (1) architecture of the flagellate cell (flagellate cells are considered as the depositories of primitive characters); (2) type of mitosis-cytokinesis; (3) place of meiosis in the life history and, consequently, the sexual hfe history type; (4) organizational level and thallus architecture; (5) habitat type (marine versus feshwater and terrestrial); (6) chloroplast type.

show abstract

“…In the 1970s, ultrastructural studies led to reclassification of this group (Melkonian 1979, McArthur andMoss 1973). Most studies of Ulva marine species focused on the ultrastructure aspects of the rhizoid cell morphology (Bråten 1975), the mitosis process (Lovlie and Bråten 1970), zoospores (Callow et al 2001), and their flagellar apparatus (Melkonian 1979), and on differences in the thickness of the thylakoid membrane (Bond et al 1997). Moreover, as evidenced by the study of marine Ulva flexuosa, high Ca 2+ concentration resulted in thickening and smoothing of the cell wall internal layers, an increase in the number of starch granules, and an increase in the dimension and the number of cytoplasmic lipid droplets (Andrade et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Ulva flexuosa subsp. pilifera (Chlorophyta, Ulvophyceae) from the Wielkopolska region (West Poland): a new observation on the ultrastructure of vegetative cells

Messyasz

Czerwik-Marcinkowska

Uher³

et al. 2013

Oceanological and Hydrobiological Studies

View full text Add to dashboard Cite

Ulva flexuosa subsp. pilifera previously known from northern Poland, from the channel near Szczecin and ponds near Łódź, has recently been found in the Malta Reservoir in the Wielkopolska (West Poland) region. Specimens collected in the Wielkopolska region were examined in detail, also under a transmission electron microscope (TEM). The morphometric analysis of Ulva thalli (both young and mature specimens) was performed in order to study the differences in the ultrastructure of vegetative cells. Rectangular cells in young thalli measured * Corresponding author: marcinko@kielce.com.pl from 32.21 -55.81 μm to 20.24 -35.12 μm, and they formed clear longitudinal rows, while cells in the mature specimens ranged from 25.09 -47.66 μm to 18.90 -31.56 μm. This study indicates that vegetative cells of the mature thalli show tendency towards distortions of both the longitudinal and transverse cells arrangement. This distortion is determined by the development of possible carbonate calcium crystals on the thalli surface. The ultrastructural analysis (TEM) confirmed that the structure and placement of thylakoids is genus/species specific.

show abstract

Structure and significance of cruciate flagellar root systems in green algae: Zoospores ofUlva lactuca (Ulvales, Chlorophyceae)

Cited by 49 publications

References 25 publications

Flagellar Apparatus of the Quadriflagellated Zoospore of Chaetomorpha spiralis Okamura (Cladophorales, Chlorophyta)

Flagellar Apparatus of the Quadriflagellated Zoospore of Chaetomorpha spiralis Okamura (Cladophorales, Chlorophyta)

The emergence of a new chlorophytan system, and Dr. Kornmann's contribution thereto

Ulva flexuosa subsp. pilifera (Chlorophyta, Ulvophyceae) from the Wielkopolska region (West Poland): a new observation on the ultrastructure of vegetative cells

Contact Info

Product

Resources

About