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  • 1
    Electronic Resource
    Electronic Resource
    The comparative aspects of cell wall chemistry in the green algae (chlorophyta) (1980)
    Springer
    Journal of molecular evolution 15 (1980), S. 1-12 
    Details
    ISSN: 1432-1432
    Keywords: Green algae ; Phylogeny ; Cell walls ; Glycoproteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The origin of a cell wall was an event of fundamental importance in the evolution of plants. In the green algae, cell walls apparently had independent origins in at least three lines of evolution. In this paper, the components of the cell wall were determined and compared in four filamentous green algae representing the charophycean, chlorophycean and ulvacean evolutionary lines. The walls of all four have hydroxyproline-containing proteins which separate into five or six bands upon SDS gel electrophoresis. Variation does exist, with the charophyte possessing fast moving electrophoretic bands and high hydroxyproline content, the chlorophytes having intermediate movement of bands and lower hydroxyproline content, and the ulvacean representative possessing slow moving bands and a very low, if not questionable, hydroxyproline and saccharide content. Qualitative and quantitative estimates of wall proteins and sugars have been determined and compared. A hypothetical scheme of cell wall evolution based on these data, those of previous analyses, and recent phylogenetic schemes is presented. Although sound conclusions cannot be made until more information is available, the scheme might help to emphasize the areas most in need of additional research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01732578
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  • 2
    Electronic Resource
    Electronic Resource
    The novel light-harvesting pigment-protein complex ofMantoniella squamata (Chlorophyta): Phylogenetic implications (1986)
    Springer
    Journal of molecular evolution 23 (1986), S. 168-176 
    Details
    ISSN: 1432-1432
    Keywords: Chlorophyta ; Micromonadophyceae ; Mantoniella ; Micromonas ; Pedinomonas ; Pigment-protein complexes ; Phylogeny ; Immunochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A light-harvesting pigment-protein complex has been isolated fromMantoniella squamata (Micromonadophyceae, Chlorophyta) by nondenaturing polyacrylamide-gel electrophoresis. The complex runs as two bands of molecular weights 54,000 and 55,000. There are two constituent polypeptides of molecular weights 20,500 and 22,000. Antibodies were raised to the 20,500-dalton polypeptides from this complex and to the 24,500-dalton polypeptide from the analogous complex ofPedinomonas minor (Micromonadophyceae). The antibodies to theM. squamata polypeptide are specific for both polypeptides of theM. squamata light-harvesting complex, as well as for a 27,000-dalton polypeptide of undetermined function. The antibodies to theP. minor polypeptide are specific for polypeptide components of the light-harvesting complex of that alga. The antibodies specific for theM. squamata light-harvesting complex polypeptides do not cross react with any polypeptides ofP. minor thylakoid membranes, as demonstrated by crossed immunoelectrophoresis. Similarly, no polypeptides ofM. squamata thylakoids cross react with the antibodies specific forP. minor light-harvesting complex polypeptides. These results indicate that the light-harvesting complex ofM. squamata is structurally very different from that ofP. minor. In a survey of several land plants and green algae, including representatives of all classes of green algae, a light-harvesting complex homologous to that ofM. squamata was found only inMicromonas pusilla. All other organisms tested possessed a lightharvesting complex homologous to that ofP. minor. The evolutionary and taxonomic implications of the novelM. squamata light-harvesting complex are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02099911
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  • 3
    Electronic Resource
    Electronic Resource
    The case for a polyphyletic origin of mitochondria: Morphological and molecular comparisons (1984)
    Springer
    Journal of molecular evolution 21 (1984), S. 54-57 
    Details
    ISSN: 1432-1432
    Keywords: Mitochondrion ; Cytochrome C ; Rhodospirillaceae ; Endosymbiosis ; rRNA ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The comparative morphology and pigmentation of protists suggest that those with tubular mitochondrial cristae belong to a different lineage than those with lamellar cristae and that the evolutionary divergence might have been very early. We propose that the difference in cristal morphology is the result of separate origins of the mitochondria from endosymbionts related to the Rhodospirillaceae (purple nonsulfur bacteria) but differing in the morphology of their internal membranes. Comparisons of the cytochromes c of protists and the Rhodospirillaceae and of 16s rRNA T1 oligonucleotide catalogs in the Rhodospirillaceae do not contradict, and in fact provide support for, the idea. More extensive evidence may be lacking simply because cytochromes c have been studied in very few protists with tubular mitochondrial cristae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02100627
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  • 4
    Electronic Resource
    Electronic Resource
    The flagellar apparatus ofMesostigma viride (Prasinophyceae): Multilayered structures in a scaly green flagellate (1981)
    Springer
    Plant systematics and evolution 138 (1981), S. 247-258 
    Details
    ISSN: 1615-6110
    Keywords: Chlorophyta ; Prasinophyceae ; Flagellar apparatus ; multilayered structures ; phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mesostigma viride Lauterborn (Prasinophyceae) is the first green flagellate found to have multilayered structures (MLS) in its flagellar apparatus. MLS's were previously known from green algae only in charophycean swarmers, linking theCharophyceae to the origin of land plants, whose male gametes (when flagellated) also possess an MLS.M. viride is, therefore, probably more closely related to the origin of theCharophyceae than any other green flagellate that has been thoroughly studied so far. The occurrence of MLS's in green flagellates and apparently in other algae and protozoans suggests that an MLS occurred in an ancient group of flagellates and has survived in various protistan lines, including the line of green algae related to land plants. The occurrence of a synistosome inM. viride and other of its characteristics suggest that it is more closely related toPyramimonas than to other genera of scaly green flagellates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985188
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