Zygnematophyceae

Zygnematophyceae
Conjugation in Spirogyra.
Scientific classification
Domain: Eukaryota
(unranked): Archaeplastida
Kingdom: Plantae
(unranked): Streptophyta
Division: Charophyta
Class: Zygnematophyceae
Round, 1971
Orders

Zygnematales
Desmidiales

Synonyms[1]
  • Akontae Blackman & Tansley, 1902
  • Conjugatophyceae Engler, 1892
  • 'Conjugatae' Engler, 1892
  • Gamophyceae
  • Saccodermae Pascher ex Kossinskaja, 1952
  • Zygnemaphyceae Round 1971
  • Zygophyceae Widder, 1960

Zygnematophyceae is a class of green algae in the division Charophyta.[2] It contains two orders: Zygnematales and Desmidiales. From all the Charophyta, the Zygnematophyceae are considered to represent the closest relatives to land plants.[3][4]

Sexual reproduction in the Zygnematophyceae takes place through a process called conjugation.[5] Here cells or filaments of opposite gender line up, and tubes form between corresponding cells. The male cells then become amoeboid and crawl across the female, or sometimes both cells crawl into the connecting tube. The cells then meet and fuse to form a zygote, which later undergoes meiosis to produce new cells or filaments. As in plants, only the female passes its chloroplasts on to the offspring.

References

  1. ↑ Guiry, M.D. (2013). Taxonomy and nomenclature of the Conjugatophyceae (=Zygnematophyceae). Algae. An International Journal of Algal Research 28: 1-29.
  2. ↑ Gontcharov AA, Marin B, Melkonian M (March 2004). "Are combined analyses better than single gene phylogenies? A case study using SSU rDNA and rbcL sequence comparisons in the Zygnematophyceae (Streptophyta)". Mol. Biol. Evol. 21 (3): 612–24. doi:10.1093/molbev/msh052. PMID 14739253.
  3. ↑ Wickett, Norman J.; Mirarab, Siavash; Nguyen, Nam; Warnow, Tandy; Carpenter, Eric; Matasci, Naim; Ayyampalayam, Saravanaraj; Barker, Michael S.; Burleigh, J. Gordon (2014-11-11). "Phylotranscriptomic analysis of the origin and early diversification of land plants". Proceedings of the National Academy of Sciences. 111 (45): E4859–E4868. doi:10.1073/pnas.1323926111. ISSN 0027-8424. PMC 4234587Freely accessible. PMID 25355905.
  4. ↑ de Vries, Jan; Stanton, Amanda; Archibald, John M.; Gould, Sven B. (2016-02-16). "Streptophyte Terrestrialization in Light of Plastid Evolution". Trends in Plant Science. 0 (0). doi:10.1016/j.tplants.2016.01.021. ISSN 1360-1385.
  5. ↑ Kapraun DF (April 2007). "Nuclear DNA Content Estimates in Green Algal Lineages: Chlorophyta and Streptophyta". Ann. Bot. 99 (4): 677–701. doi:10.1093/aob/mcl294. PMC 2802934Freely accessible. PMID 17272304.


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