Get Prasinophyceae essential facts below. View Videos or join the Prasinophyceae discussion. Add Prasinophyceae to your PopFlock.com topic list for future reference or share this resource on social media.
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.
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) and several different ecotypes of Ostreococcus have been detected in the environment. 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 and observed year-round in the coastal North Pacific Ocean. 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.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.
Prasinophytes are subject to infection by large double-stranded DNA viruses belonging to the genus Prasinovirus in the family Phycodnaviridae, as well as a Reovirus. It has been estimated that from 2 to 10% of the Micromonas pusilla population is lysed per day by viruses.
Recent studies agree that the prasinophytes are not a natural group, being highly paraphyletic. Relationships among the groups making up the Chlorophyta are not fully resolved. The cladogram produced by Leliaert et al. 2011 and some modification according to Silar 2016, Leliaert 2016 and Lopes dos Santos et al. 2017 is shown below. The blue shaded groups are or have traditionally been placed in the Prasinophyceae). 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.
^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. Bibcode:2003MEPS..251...87W. doi:10.3354/meps251087.
^Cottrell MT, Suttle CA (1991). "Wide-spread occurrence and clonal variation in viruses which cause lysis of a cosmopolitan, eukaryotic marine phytoplankter, "Micromonas pusilla"". Marine Ecology Progress Series. 78: 1-9. Bibcode:1991MEPS...78....1C. doi:10.3354/meps078001.
^Bellec L, Grimsley N, Derelle E, Moreau H, Desdevises Y (April 2010). "Abundance, spatial distribution and genetic diversity of Ostreococcus tauri viruses in two different environments". Environmental Microbiology Reports. 2 (2): 313-21. doi:10.1111/j.1758-2229.2010.00138.x. PMID23766083.
^Attoui H, Jaafar FM, Belhouchet M, de Micco P, de Lamballerie X, Brussaard CP (May 2006). "Micromonas pusilla reovirus: a new member of the family Reoviridae assigned to a novel proposed genus (Mimoreovirus)". The Journal of General Virology. 87 (Pt 5): 1375-83. doi:10.1099/vir.0.81584-0. PMID16603541.
^Marin B (September 2012). "Nested in the Chlorellales or independent class? Phylogeny and classification of the Pedinophyceae (Viridiplantae) revealed by molecular phylogenetic analyses of complete nuclear and plastid-encoded rRNA operons". Protist. 163 (5): 778-805. doi:10.1016/j.protis.2011.11.004. PMID22192529.