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Prasinophyte

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Prasinophyte

Prasinophyceae
Scientific classification
Domain: Eukaryota
Kingdom: Plantae
Division: Chlorophyta
Class: Prasinophyceae
T.Christensen ex P.C.Silva 1980.
Orders[1]

The Prasinophytes are a class of unicellular green algae in the Division Chlorophyta.[2] Prasinophytes mainly include marine planktonic species, as well as some freshwater representatives.[2][3] The prasinophytes are morphologically diverse, including flagellates with one to eight flagella and non-motile (coccoid) unicells. The cells of many species are covered with organic body scales; others are naked.[3] One well known genus is Ostreococcus (seen at right), considered to be the smallest (ca. 0.95 μm) free-living eukaryote,[4] found in marine waters world wide. Prasinophytes have simple cellular structures, containing a single chloroplast and a single mitochondrion. The genomes are relatively small compared to other eukaryotes (about 12 Mbp for Ostreococcus[5][6] and 21 Mbp for Micromonas[7]).

Recent studies agree that the prasinophytes are a non-evolutionary grouping (paraphyletic) of chlorophyte green algae from different clades. Alternative classifications of the chlorophytes have been proposed in which this class is replaced by at least six separate taxa.[8]

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)[9] and several different ecotypes of Ostreococcus have been detected in the environment.[10] These ecotypes were thought to be distinguished in the environment by their adaptation to light intensities. O. lucimarinus was isolated from a high-light environment[11] and observed year-round in the coastal North Pacific Ocean.[12] RCC141 was considered low-light, because it was isolated from the lower euphotic zone. These strains, or ecotypes, were later shown to live in different habitats (open-ocean or mesotrophic) and their distributions do not appear to be connected to light availability.[13] O. tauri was isolated from a coastal lagoon and appears to be light-polyvalent. Genetic data indicates that distinct molecular differences exist between the different ecotypes that have been detected.[14]

Phylogeny

Recent studies agree that the prasinophytes are not a natural group, being highly paraphyletic.[8][15] Relationships among the groups making up the chlorophytes are not fully resolved. The cladogram produced by Becker and Marin in 2009 is shown below. The blue shaded groups are all prasinophytes. The prasinophyte species Mesostigma viride has been shown to be a member of the Streptophyta rather than the Chlorophyta, so is not included in this cladogram.[15]

Chlorophyta


References

External links

Links to scientific references

  • PubMed references for Prasinophyceae
  • PubMed Central references for Prasinophyceae
  • Google Scholar references for Prasinophyceae

Links to scientific databases

  • NCBI taxonomy page for Prasinophyceae
  • Search Tree of Life taxonomy pages for Prasinophyceae
  • Search Species2000 page for Prasinophyceae
  • AlgaeBase
  • AlgaTerra database
  • Index Nominum Genericorum


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