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In [[alpha taxonomy|taxonomy]], '''Prasinophytes''' are a class of primitive [[eukaryotic]], marine [[green algae]].<ref>{{cite journal | author = Sym SD, Pienaar RN | year = 1993 | title = The class Prasinophyceae | journal = Prog Phycol Res | volume = 9 | pages = 281–376}}</ref> Its best known genus is ''[[Ostreococcus]]'', which is considered to be the smallest (ca. 0.95 [[micrometre|μm]]) free-living [[eukaryote]]<ref>{{cite journal | author = Courties C, Vaquer A, Troussellier M, Lautier J, Chrétiennot-Dinet MJ, Neveux J, Machado C, Claustre H | year = 1994 | title = Smallest eukaryotic organism | journal = Nature | volume = 370 | pages = 255}}</ref> and which has been detected in marine samples around the world. Prasinophytes are thought to have low cellular complexity i.e. they are naked cells that possess single, multiple or no [[flagellae]] and contain only a single [[chloroplast]] and a single [[mitochondrium]]. They also have very small genomes for a eukaryote (about 12Mbp). |
In [[alpha taxonomy|taxonomy]], '''Prasinophytes''' are a class of primitive [[eukaryotic]], marine [[green algae]].<ref>{{cite journal | author = Sym SD, Pienaar RN | year = 1993 | title = The class Prasinophyceae | journal = Prog Phycol Res | volume = 9 | pages = 281–376}}</ref> Its best known genus is ''[[Ostreococcus]]'', which is considered to be the smallest (ca. 0.95 [[micrometre|μm]]) free-living [[eukaryote]]<ref>{{cite journal | author = Courties C, Vaquer A, Troussellier M, Lautier J, Chrétiennot-Dinet MJ, Neveux J, Machado C, Claustre H | year = 1994 | title = Smallest eukaryotic organism | journal = Nature | volume = 370 | pages = 255 | doi = 10.1038/370255a0}}</ref> and which has been detected in marine samples around the world. Prasinophytes are thought to have low cellular complexity i.e. they are naked cells that possess single, multiple or no [[flagellae]] and contain only a single [[chloroplast]] and a single [[mitochondrium]]. They also have very small genomes for a eukaryote (about 12Mbp). |
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== Ecology == |
== Ecology == |
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A study of photosynthetic gene-sequence diversity (''rbcL'') in the [[Gulf of Mexico]] indicated that Prasinophytes are particularly prevalent at the [[Subsurface Chlorophyll Maximum]] (SCM)<ref>{{cite journal | author = Wawrik B, Paul JH, Campbell L, Griffin D, Houchin L, Fuentes-Ortega A, Müller-Karger F | year = 2003 | title = Vertical Structure of the Phytoplankton Community Associated with a Coastal Plume in the Gulf of Mexico | journal = Marine Ecology Progress Series | volume = 251 | pages = 87–101}}</ref> and several different ecotypes of ''Ostreococcus'' have been detected in the environment. <ref>{{cite journal | author = Guillou L, Eikrem W, Chrétiennot-Dinnet MJ, Le Gall F, Massana R, Romari K, Pedros-Alio C, Vaulot D | year = 2004 | title = Diversity of picoplanktonic Prasinophyceae assessed by direct SSU rDNA sequencing of environmental samples and novel isolates retrieved from oceanic and coastal marine ecosystems | journal = Protist | volume = 155 | pages = 193–214}}</ref> These ecotypes are distinguished by their adaptation to light intensities. ''O. lucimarinus'' is found in high-light environments and represents surface-isolated strains. RCC141 is considered low-light, because these strains were isolated from the lower [[euphotic zone]]. ''O. tauri'' was isolated from a coastal lagoon and is considered light-polyvalent. Genetic data indicates that distinct molecular differences exist between the different ecotypes that have been detected.<ref>{{cite journal | author = Rodríguez F, Derelle E, Guillou L, Le Gall F, Vaulot D, Moreau H| year = 2005 | title = Ecotype diversity in the marine picoeukaryote Ostreococcus (Chlorophyta, Prasinophyceae) | journal = Environmental Microbiology | volume = 7 | pages = 853–859 }}</ref> |
A study of photosynthetic gene-sequence diversity (''rbcL'') in the [[Gulf of Mexico]] indicated that Prasinophytes are particularly prevalent at the [[Subsurface Chlorophyll Maximum]] (SCM)<ref>{{cite journal | author = Wawrik B, Paul JH, Campbell L, Griffin D, Houchin L, Fuentes-Ortega A, Müller-Karger F | year = 2003 | title = Vertical Structure of the Phytoplankton Community Associated with a Coastal Plume in the Gulf of Mexico | journal = Marine Ecology Progress Series | volume = 251 | pages = 87–101 | doi = 10.3354/meps251087}}</ref> and several different ecotypes of ''Ostreococcus'' have been detected in the environment. <ref>{{cite journal | author = Guillou L, Eikrem W, Chrétiennot-Dinnet MJ, Le Gall F, Massana R, Romari K, Pedros-Alio C, Vaulot D | year = 2004 | title = Diversity of picoplanktonic Prasinophyceae assessed by direct SSU rDNA sequencing of environmental samples and novel isolates retrieved from oceanic and coastal marine ecosystems | journal = Protist | volume = 155 | pages = 193–214 | doi = 10.1078/143446104774199592}}</ref> These ecotypes are distinguished by their adaptation to light intensities. ''O. lucimarinus'' is found in high-light environments and represents surface-isolated strains. RCC141 is considered low-light, because these strains were isolated from the lower [[euphotic zone]]. ''O. tauri'' was isolated from a coastal lagoon and is considered light-polyvalent. Genetic data indicates that distinct molecular differences exist between the different ecotypes that have been detected.<ref>{{cite journal | author = Rodríguez F, Derelle E, Guillou L, Le Gall F, Vaulot D, Moreau H| year = 2005 | title = Ecotype diversity in the marine picoeukaryote Ostreococcus (Chlorophyta, Prasinophyceae) | journal = Environmental Microbiology | volume = 7 | pages = 853–859 | doi = 10.1111/j.1462-2920.2005.00758.x }}</ref> |
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== References == |
== References == |
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Revision as of 08:35, 9 June 2008
| Prasinophyceae | |
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| Scientific classification | |
| Domain: | |
| Kingdom: | |
| Division: | |
| Class: | Prasinophyceae
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| Orders[1] | |
In taxonomy, Prasinophytes are a class of primitive eukaryotic, marine green algae.[2] Its best known genus is Ostreococcus, which is considered to be the smallest (ca. 0.95 μm) free-living eukaryote[3] and which has been detected in marine samples around the world. Prasinophytes are thought to have low cellular complexity i.e. they are naked cells that possess single, multiple or no flagellae and contain only a single chloroplast and a single mitochondrium. They also have very small genomes for a eukaryote (about 12Mbp).
Ecology
A study of photosynthetic gene-sequence diversity (rbcL) in the Gulf of Mexico indicated that Prasinophytes are particularly prevalent at the Subsurface Chlorophyll Maximum (SCM)[4] and several different ecotypes of Ostreococcus have been detected in the environment. [5] These ecotypes are distinguished by their adaptation to light intensities. O. lucimarinus is found in high-light environments and represents surface-isolated strains. RCC141 is considered low-light, because these strains were isolated from the lower euphotic zone. O. tauri was isolated from a coastal lagoon and is considered light-polyvalent. Genetic data indicates that distinct molecular differences exist between the different ecotypes that have been detected.[6]
References
- ^ Guiry, M.D. & Guiry, G.M. (2007). "Class: Prasinophyceae taxonomy browser". AlgaeBase version 4.2 World-wide electronic publication, National University of Ireland, Galway. Retrieved 2007-09-23.
{{cite web}}: Italic or bold markup not allowed in:|publisher=(help)CS1 maint: multiple names: authors list (link) - ^ Sym SD, Pienaar RN (1993). "The class Prasinophyceae". Prog Phycol Res. 9: 281–376.
- ^ Courties C, Vaquer A, Troussellier M, Lautier J, Chrétiennot-Dinet MJ, Neveux J, Machado C, Claustre H (1994). "Smallest eukaryotic organism". Nature. 370: 255. doi:10.1038/370255a0.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Wawrik B, Paul JH, Campbell L, Griffin D, Houchin L, Fuentes-Ortega A, Müller-Karger F (2003). "Vertical Structure of the Phytoplankton Community Associated with a Coastal Plume in the Gulf of Mexico". Marine Ecology Progress Series. 251: 87–101. doi:10.3354/meps251087.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Guillou L, Eikrem W, Chrétiennot-Dinnet MJ, Le Gall F, Massana R, Romari K, Pedros-Alio C, Vaulot D (2004). "Diversity of picoplanktonic Prasinophyceae assessed by direct SSU rDNA sequencing of environmental samples and novel isolates retrieved from oceanic and coastal marine ecosystems". Protist. 155: 193–214. doi:10.1078/143446104774199592.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Rodríguez F, Derelle E, Guillou L, Le Gall F, Vaulot D, Moreau H (2005). "Ecotype diversity in the marine picoeukaryote Ostreococcus (Chlorophyta, Prasinophyceae)". Environmental Microbiology. 7: 853–859. doi:10.1111/j.1462-2920.2005.00758.x.
{{cite journal}}: CS1 maint: multiple names: authors list (link)
External links
Links to scientific references
Links to scientific databases
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