Prasinophyte
Paraphyletic group of chlorophytes
Pyramimonas sp.
Pyramimonas sp.
Scientific classificationEdit this classification
(unranked): 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]

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)[12] and several different ecotypes of Ostreococcus have been detected in the environment.[13] 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[14] and observed year-round in the coastal North Pacific Ocean.[15] 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.[16] 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.[17]

Prasinophytes are subject to infection by large double-stranded DNA viruses belonging to the genus Prasinovirus in the family Phycodnaviridae,[18][19][20] as well as a Reovirus.[21] It has been estimated that from 2 to 10% of the Micromonas pusilla population is lysed per day by viruses.[22]

Phylogeny

Recent studies agree that the prasinophytes are not a natural group, being highly paraphyletic.[4][23][24][25] Relationships among the groups making up the Chlorophyta are not fully resolved. The cladogram produced by Leliaert et al. 2011[4] and some modification according to Silar 2016,[26] Leliaert 2016[27] and Lopes dos Santos et al. 2017[1] is shown below. The blue shaded groups are or have traditionally been placed in the Prasinophyceae[3]). The species Mesostigma viride has been shown to be a member of the Streptophyta or basal Green algae. The others are member of the Chlorophyta.

Green Algae
Chlorophyta/
Palmophyllophyceae

Prasinococcales ("prasinophyte clade VI")

Palmophyllales

Pyramimonadophyceae ("prasinophyte clade I")

Monomastigales

Dolichomastigales

Mamiellales

("prasinophyte clade II")
Nephroselmidophyceae

Nephroselmidales ("prasinophyte clade III")

?Pycnococcaceae ("prasinophyte clade V")

Picocystophyceae ("prasinophyte clade VII C")

Chloropicophyceae ("prasinophyte clade VII A/B")

Tetraphytina

Pedinophyceae

Chlorophytina

Chlorodendrophyceae ("prasinophyte clade IV")

Trebouxiophyceae

Ulvophyceae

Chlorophyceae

Prasinophyta
Streptophyta

Chlorokybophyceae

Mesostigmatophyceae

Klebsormidiophyceae

Charophyceae

Zygnematophyceae

Coleochaetophyceae

Land plants

As 2020 paper places the Palmophyllophyceae (prasinophyte clade VI) in a new phylum outside of the Chlorophyta and Streptophyta, the Prasinodermophyta.[28]

See also

References

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  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. 1 2 3 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.
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