Prasinophyte

Prasinophyte
Paraphyletic group of chlorophytes
Pyramimonas sp.
Pyramimonas sp.
Scientific classificationEdit this classification
Clade: Viridiplantae
Division: Chlorophyta
Informal group: Prasinophyte
Included classes[1][2]
Excluded classes
(i.e. chlorophytes not considered prasinophytes)

The prasinophytes are a group of unicellular green algae.[3] Prasinophytes mainly include marine planktonic species, as well as some freshwater representatives.[3][4] 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.[4] Well studied genera include Ostreococcus, considered to be the smallest (ca. 0.95 μm) free-living eukaryote,[5] and Micromonas, both of which are found in marine waters worldwide. 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[6][7] and 21 Mbp for Micromonas[8]). At least one species, the Antarctic form Pyramimonas gelidicola, is capable of phagocytosis and is therefore a mixotrophic algae.[9]

Some authors treat the prasinophytes as a polyphyletic grouping of green algae from different clades. As the Tetraphytina emerged in the Prasinophytes, recently authors include it, rendering it monophyletic, and equivalent to chlorophyta.[10][11]

  1. ^ Cite error: The named reference Lopesdesantos-2017 was invoked but never defined (see the help page).
  2. ^ Linzhou Li; Sibo Wang; Hongli Wang; Sunil Kumar Sahu; Birger Marin; Haoyuan Li; Yan Xu; Hongping Liang; Zhen Li; Shifeng Chen; Tanja Reder; Zehra Çebi; Sebastian Wittek; Morten Petersen; Barbara Melkonian; Hongli Du; Huanming Yang; Jian Wang; Gane Ka-Shu Wong; Xun Xu; Xin Liu; Yves Van de Peer; Michael Melkonian; Huan Liu (22 June 2020). "The genome of Prasinoderma coloniale unveils the existence of a third phylum within green plants". Nature Ecology & Evolution. 4 (9): 1220–1231. doi:10.1038/s41559-020-1221-7. PMC 7455551. PMID 32572216.
  3. ^ a b Sym, S. D. and Pienaar, R. N. 1993. The class Prasinophyceae. In Round, F. E. and Chapman, D. J. (eds) Progress in Phycological Research, Vol. 9. Biopress Ltd., Bristol, pp. 281-376.
  4. ^ a b Leliaert F, Verbruggen H, Zechman FW (September 2011). "Into the deep: new discoveries at the base of the green plant phylogeny". BioEssays. 33 (9): 683–92. doi:10.1002/bies.201100035. PMID 21744372. S2CID 40459076.
  5. ^ Courties C, Vaquer A, Troussellier M, Lautier J, Chrétiennot-Dinet MJ, Neveux J, et al. (1994). "Smallest eukaryotic organism". Nature. 370 (6487): 255. Bibcode:1994Natur.370..255C. doi:10.1038/370255a0.
  6. ^ Derelle E, Ferraz C, Rombauts S, Rouzé P, Worden AZ, Robbens S, Partensky F, Degroeve S, Echeynié S, Cooke R, Saeys Y, Wuyts J, Jabbari K, Bowler C, Panaud O, Piégu B, Ball SG, Ral JP, Bouget FY, Piganeau G, De Baets B, Picard A, Delseny M, Demaille J, Van de Peer Y, Moreau H (August 2006). "Genome analysis of the smallest free-living eukaryote Ostreococcus tauri unveils many unique features". Proceedings of the National Academy of Sciences of the United States of America. 103 (31): 11647–52. Bibcode:2006PNAS..10311647D. doi:10.1073/pnas.0604795103. PMC 1544224. PMID 16868079.
  7. ^ Palenik B, Grimwood J, Aerts A, Rouzé P, Salamov A, Putnam N, et al. (May 2007). "The tiny eukaryote Ostreococcus provides genomic insights into the paradox of plankton speciation". Proceedings of the National Academy of Sciences of the United States of America. 104 (18): 7705–10. Bibcode:2007PNAS..104.7705P. doi:10.1073/pnas.0611046104. PMC 1863510. PMID 17460045.
  8. ^ Worden AZ, Lee JH, Mock T, Rouzé P, Simmons MP, Aerts AL, et al. (April 2009). "Green evolution and dynamic adaptations revealed by genomes of the marine picoeukaryotes Micromonas". Science. 324 (5924): 268–72. Bibcode:2009Sci...324..268W. doi:10.1126/science.1167222. PMID 19359590. S2CID 206516961.
  9. ^ Mixotrophy in the Antarctic phytoflagellate, Pyramimonas gelidicola (Chlorophyta: Prasinophyceae)
  10. ^ Tevatia R, Oyler GA (2018-01-02). "Evolution of DDB1-binding WD40 (DWD) in the viridiplantae". PLOS ONE. 13 (1): e0190282. Bibcode:2018PLoSO..1390282T. doi:10.1371/journal.pone.0190282. PMC 5749748. PMID 29293590.
  11. ^ Rockwell NC, Martin SS, Li FW, Mathews S, Lagarias JC (May 2017). "The phycocyanobilin chromophore of streptophyte algal phytochromes is synthesized by HY2". The New Phytologist. 214 (3): 1145–1157. doi:10.1111/nph.14422. PMC 5388591. PMID 28106912.