Streptophyta

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Streptophyta
Chara globularis

Chara globularis

Systematics
without rank: Diaphoreticks
without rank: Archaeplastida
without rank: Chloroplastida
without rank: Charophyta
without rank: Phragmoplastophyta
without rank: Streptophyta
Scientific name
Streptophyta
Lewis & McCourt , 2004

The Streptophyta are a group of photosynthetically active, multicellular eukaryotes , i.e. living beings with cell nuclei . The group consists of chandelier algae and land plants (Embryophyta).

features

All characteristics of the Charophyta also apply to the Streptophyta . Cell division here generally takes place via a phragmoplast . The cellulose is synthesized from rosette-shaped enzyme complexes . All species are multicellular, vegetative growth occurs with an apical cell (s) at the end of the side branches or the main axis. Sexual reproduction occurs through oogamy , with the egg cells being protected in a shell. The spermatozoids are mostly twisted. In the case of derived forms, this characteristic recedes: cycads and ginkgo have spermatozoids with a twisted flagella band, the other seed plants have uncultivated and non-twisted sperm. The cell divisions take place in all three spatial levels.

Systematics

In recent years, candelabrum algae have clearly emerged as the sister group of plants. Therefore, these two groups are combined within the Charophyta as a separate Streptophyta group. According to Adl u. a. In 2005 the taxa are not assigned any ranks:

See also

literature

  • Sina M. Adl, Alastair GB Simpson, Mark A. Farmer, Robert A. Andersen, O. Roger Anderson, John A. Barta, Samual S. Bowser, Guy Bragerolle, Robert A. Fensome, Suzanne Fredericq, Timothy Y. James, Sergei Karpov, Paul Kugrens, John Krug, Christopher E. Lane, Louise A. Lewis, Jean Lodge, Denis H. Lynn, David G. Mann, Richard M. McCourt, Leonel Mendoza, Øjvind Moestrup, Sharon E. Mozley-Standridge, Thomas A. Nerad, Carol A. Shearer, Alexey V. Smirnov, Frederick W. Spiegel, Max FJR Taylor: The New Higher Level Classification of Eukaryotes with Emphasis on the Taxonomy of Protists. The Journal of Eukaryotic Microbiology 52 (5), 2005; Pages 399–451 ( abstract and full text )
  • Louise A. Lewis, Richard M. McCourt: Green Algae and the origin of land plants : American Journal of Botany 91 (10), 2004, pages 1535-1556. Abstract and full text