Coleochaete

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Coleochaete
Scientific classification
Kingdom: Plantae
Division: Charophyta
Class: Coleochaetophyceae
Order: Coleochaetales
Family: Coleochaetaceae
Genus: Coleochaete
Brebisson, 1844
Species

See text

Coleochaete is a genus of parenchymatous green algae in the family Coleochaetaceae.[1] They are haploid, reproduce asexually, they can be characterised by true multicellular organisation (with plasmodesmata), creating planar sprawling discs on solid surfaces in freshwater streams worldwide, usually as epiphytes on aquatic plants or growing on the surface of stones. They are seen as one of two most probable ancestor groups to land plant species.[2][3][4] (The second candidates being the Characeae, the issue - as of 2009 - is still not solved[4]). As they show some of the earliest and simplest features of multicellular plant growth, that makes them ideal model organisms in the field of synthetic biology. They are easy to culture and techniques that have been used to study Arabidopsis thaliana are now being applied to the Coleochaete.[5]

Coleochaete also has a sterile jacket of cells that surround the gametangia, and zygotes that are protected by a layer of sterile cells after fertilization. However, unlike plants, the Charophyceae has zygotic meiosis and therefore could not have been the literal ancestor of plants

Species

  • Coleochaete divergens (ITIS)
  • Coleochaete irregularis (ITIS)
  • Coleochaete nitellarum (ITIS)
  • Coleochaete orbicularis (ITIS)
  • Coleochaete pulvinata (ITIS)
  • Coleochaete sampsonii (ITIS)
  • Coleochaete scutata (ITIS)
  • Coleochaete soluta (ITIS)

References

  1. ↑ Delwiche, C.F.; Karol, K.G.; Cimino, M.T.; Sytsma, K.J. (2002), "Phylogeny of the genus Coleochaete (Coleochaetales, Charophyta) and related taxa inferred by analysis of the chloroplast gene rbc{L}", Journal of Phycology 38: 394–403, doi:10.1046/j.1529-8817.2002.01174.x 
  2. ↑ http://www.plantsci.cam.ac.uk/Haseloff/biosystems/Coleochaete/ExpBenefits.htm Benefits of the Coleochaete system
  3. ↑ http://www.plantsci.cam.ac.uk/Haseloff/laboratory/labdocs/LabPDFs/Dupuy2006.pdf A biomechanical model for the study of plant morphogenesis: Coleocheate orbicularis, a 2D study species. Lionel Dupuy, Jonathan Mackenzie and Jim Haseloff
  4. ↑ 4.0 4.1 Becker, B.; Marin, B. (2009), "Streptophyte algae and the origin of embryophytes", Annals of Botany 103 (7): 999–1004, doi:10.1093/aob/mcp044, PMC 2707909, PMID 19273476 
  5. ↑ http://www.plantsci.cam.ac.uk/Haseloff/biosystems/Index_systems.htm Experimental systems for plant morphogenesis

External links


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