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Chlorophyta

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This article is about a group of green algae. For the genus with the common name 'spider plant', see Chlorophytum.

Chlorophyta
Chlorophytes (A–F, H–L and O)
Scientific classification Edit this classification
Domain: Eukaryota
Clade: Diaphoretickes
(unranked): Archaeplastida
(unranked): Viridiplantae
Division: Chlorophyta
Reichenbach, 1828, emend. Pascher, 1914, emend. Lewis & McCourt, 2004[1][2][3]
Classes[4]
Synonyms[5]
  • Chlorophycophyta Papenfuss 1946
  • Chlorophycota
  • Chlorophytina
  • Chlorophyllophyceae
  • Isokontae
  • Stephanokontae
Green algae on coastal rocks at Shihtiping in Taiwan

Chlorophyta is a taxon of green algae informally called chlorophytes.[6] The name is used in two very different senses, so care is needed to determine the use by a particular author. In older classification systems, it is a highly paraphyletic group of all the green algae within the green plants (Viridiplantae) and thus includes about 7,000 species[7][8] of mostly aquatic photosynthetic eukaryotic organisms. In newer classifications, it is the sister clade of the streptophytes/charophytes. The clade Streptophyta consists of the Charophyta in which the Embryophyta (land plants) emerged.[9][10] In this latter sense the Chlorophyta includes only about 4,300 species.[4] About 90% of all known species live in freshwater.[11] Like the land plants (embryophytes: bryophytes and tracheophytes), green algae (chlorophytes and charophytes besides embryophytes) contain chlorophyll a and chlorophyll b and store food as starch[7] in their plastids.

With the exception of the three classes Ulvophyceae, Trebouxiophyceae and Chlorophyceae in the UTC clade, which show various degrees of multicellularity, all the Chlorophyta lineages are unicellular.[12] Some members of the group form symbiotic relationships with protozoa, sponges, and cnidarians. Others form symbiotic relationships with fungi to form lichens, but the majority of species are free-living. Some conduct sexual reproduction, which is oogamous or isogamous. All members of the clade have motile flagellated swimming cells.[13] While most species live in freshwater habitats and a large number in marine habitats, other species are adapted to a wide range of land environments. For example, Chlamydomonas nivalis, which causes Watermelon snow, lives on summer alpine snowfields. Others, such as Trentepohlia species, live attached to rocks or woody parts of trees. Monostroma kuroshiense, an edible green alga cultivated worldwide and most expensive among green algae, belongs to this group.

Ecology

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Species of Chlorophyta (treated as what is now considered one of the two main clades of Viridiplantae) are common inhabitants of marine, freshwater and terrestrial environments.[14][15] Several species have adapted to specialised and extreme environments, such as deserts, arctic environments, hypersaline habitats, marine deep waters, deep-sea hydrothermal vents and habitats that experiences extreme changes in temperature, light and salinity.[16][17][18][19] Some groups, such as the Trentepohliales are exclusively found on land.[20] Several species of Chlorophyta live in symbiosis with a diverse range of eukaryotes, including fungi (to form lichens), ciliates, forams, cnidarians and molluscs. [15] Some species of Chlorophyta are heterotrophic, either free-living or parasitic.[21][22] Others are mixotrophic bacterivores through phagocytosis.[23] Two common species of the heterotrophic green alga Prototheca are pathogenic and can cause the disease protothecosis in humans and animals.[24]

Classifications

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"Siphoneae" from Ernst Haeckel's Kunstformen der Natur, 1904
Further information: Wikispecies:Chlorophyta

Characteristics used for the classification of Chlorophyta are: type of zoid, mitosis (karyokinesis), cytokinesis, organization level, life cycle, type of gametes, cell wall polysaccharides[25] and more recently genetic data.

Phylogeny

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Leliaert et al. 2012 proposed the following phylogeny. He marked the "prasinophytes" as paraphyletic, with the remaining Chlorophyta groups as "core chlorophytes". He described all Streptophyta except the land plants as paraphyletic "charophytes".[15]

"Hypothetical ancestral
green flagellate"

A 2020 paper places the "Prasinodermophyta" (i.e. Prasinodermophyceae + Palmophyllophyceae) as the basal Viridiplantae clade.[26]

Viridiplantae/
Green Algae/
Prasinophyta s.l.

Leliaert et al. 2012

[edit]

Simplified phylogeny of the Chlorophyta, according to Leliaert et al. 2012.[15] Note that many algae previously classified in Chlorophyta are placed here in Streptophyta.

Pombert et al. 2005

[edit]

A possible classification when Chlorophyta refers to one of the two clades of the Viridiplantae is shown below.[27]

Lewis & McCourt 2004

[edit]

Hoek, Mann and Jahns 1995

[edit]

Classification of the Chlorophyta, treated as all green algae, according to Hoek, Mann and Jahns 1995.[7]

In a note added in proof, an alternative classification is presented for the algae of the class Chlorophyceae:

Bold and Wynne 1985

[edit]

Classification of the Chlorophyta and Charophyta according to Bold and Wynne 1985.[29]

Mattox & Stewart 1984

[edit]

Classification of the Chlorophyta according to Mattox & Stewart 1984:[28]

Fott 1971

[edit]

Classification of the Chlorophyta according to Fott 1971.[7]: 483 

Round 1971

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Classification of the Chlorophyta and related algae according to Round 1971.[30]

Smith 1938

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Classification of the Chlorophyta according to Smith 1938:

Research and discoveries

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In February 2020, the fossilized remains of green algae, named Proterocladus antiquus were discovered in the northern province of Liaoning, China.[31] At around a billion years old, it is believed to be one of the oldest examples of a multicellular chlorophyte.[32]

References

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  1. ^ Reichenbach HG (1828). Conspectus Regni Vegetabilis. p. 23.
  2. ^ Pascher A (1914). "Über Flagellaten und Algen". Berichte der Deutschen Botanischen Gesellschaft. 32: 136–160. doi:10.1111/j.1438-8677.1914.tb07573.x. S2CID 257830577.
  3. ^ Adl SM, Simpson AG, Farmer MA, Andersen RA, Anderson OR, Barta JR, et al. (2005). "The new higher level classification of eukaryotes with emphasis on the taxonomy of protists". The Journal of Eukaryotic Microbiology. 52 (5): 399–451. doi:10.1111/j.1550-7408.2005.00053.x. PMID 16248873. S2CID 8060916.
  4. ^ Jump up to: a b Guiry MD, Guiry GM (2011). "AlgaeBase : Chlorophyta". World-wide electronic publication, National University of Ireland, Galway. Retrieved 2011-07-26.
  5. ^ Papenfuss GF (1955). "The Classification of the Algae". A century of progress in the natural sciences, 1853-1953. California Academy of Sciences.
  6. ^ 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.
  7. ^ Jump up to: a b c d van den Hoek C, Mann DG, Jahns HM (1995). Algae An Introduction to Phycology. Cambridge: Cambridge University Press. ISBN 978-0-521-30419-1.
  8. ^ "Major Algae Phyla - Table - MSN Encarta". Archived from the original on 2009-10-29.
  9. ^ Lewis LA, McCourt RM (October 2004). "Green algae and the origin of land plants". American Journal of Botany. 91 (10): 1535–56. doi:10.3732/ajb.91.10.1535. PMID 21652308.
  10. ^ Becker B, Marin B (May 2009). "Streptophyte algae and the origin of embryophytes". Annals of Botany. 103 (7): 999–1004. doi:10.1093/aob/mcp044. PMC 2707909. PMID 19273476.
  11. ^ Lee, Robert Edward (2018). Chlorophyta (Chapter 5) - Phycology - Cambridge University Press. doi:10.1017/9781316407219. ISBN 9781316407219.
  12. ^ Umen JG (October 2014). "Green algae and the origins of multicellularity in the plant kingdom". Cold Spring Harbor Perspectives in Biology. 6 (11): a016170. doi:10.1101/cshperspect.a016170. PMC 4413236. PMID 25324214.
  13. ^ Kapraun DF (April 2007). "Nuclear DNA content estimates in green algal lineages: chlorophyta and streptophyta". Annals of Botany. 99 (4): 677–701. doi:10.1093/aob/mcl294. PMC 2802934. PMID 17272304.
  14. ^ Graham LE, Graham JM, Wilcox LW (2009) Algae. 2nd Edition. Benjamin Cummings (Pearson), San Francisco, CA
  15. ^ Jump up to: a b c d Leliaert F, Smith DR, Moreau H, Herron MD, Verbruggen H, Delwiche CF, De Clerck O (2012). "Phylogeny and molecular evolution of the green algae" (PDF). Critical Reviews in Plant Sciences. 31: 1–46. doi:10.1080/07352689.2011.615705. S2CID 17603352. Archived (PDF) from the original on 2015-06-26.
  16. ^ Lewis LA, Lewis PO (December 2005). "Unearthing the molecular phylodiversity of desert soil green algae (Chlorophyta)". Systematic Biology. 54 (6): 936–47. doi:10.1080/10635150500354852. PMID 16338765.
  17. ^ De Wever A, Leliaert F, Verleyen E, Vanormelingen P, Van der Gucht K, Hodgson DA, Sabbe K, Vyverman W (October 2009). "Hidden levels of phylodiversity in Antarctic green algae: further evidence for the existence of glacial refugia". Proceedings. Biological Sciences. 276 (1673): 3591–9. doi:10.1098/rspb.2009.0994. PMC 2817313. PMID 19625320.
  18. ^ 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.
  19. ^ Foflonker F, Ananyev G, Qiu H, Morrison A, Palenik B, Dismukes GC, Bhattacharya D (June 2016). "The unexpected extremophile: Tolerance to fluctuating salinity in the green alga Picochlorum". Algal Research. 16: 465–472. doi:10.1016/j.algal.2016.04.003.
  20. ^ López-Bautista JM, Rindi F, Guiry MD (July 2006). "Molecular systematics of the subaerial green algal order Trentepohliales: an assessment based on morphological and molecular data". International Journal of Systematic and Evolutionary Microbiology. 56 (Pt 7): 1709–15. doi:10.1099/ijs.0.63990-0. hdl:10379/9448. PMID 16825655.
  21. ^ Joubert JJ, Rijkenberg FH (1971). "Parasitic green algae". Annu. Rev. Phytopathol. 9: 45–64. doi:10.1146/annurev.py.09.090171.000401.
  22. ^ Nedelcu AM (December 2001). "Complex patterns of plastid 16S rRNA gene evolution in nonphotosynthetic green algae". Journal of Molecular Evolution. 53 (6): 670–9. Bibcode:2001JMolE..53..670N. doi:10.1007/s002390010254. PMID 11677627. S2CID 21151223.
  23. ^ Anderson, R.; Charvet, S.; Hansen, P. J. (2018). "Mixotrophy in Chlorophytes and Haptophytes—Effect of Irradiance, Macronutrient, Micronutrient and Vitamin Limitation - NCBI - NIH". Frontiers in Microbiology. 9: 1704. doi:10.3389/fmicb.2018.01704. PMC 6080504. PMID 30108563.
  24. ^ Tartar A, Boucias DG, Adams BJ, Becnel JJ (January 2002). "Phylogenetic analysis identifies the invertebrate pathogen Helicosporidium sp. as a green alga (Chlorophyta)". International Journal of Systematic and Evolutionary Microbiology. 52 (Pt 1): 273–9. doi:10.1099/00207713-52-1-273. PMID 11837312.
  25. ^ Lobban CS, Wynne MJ (1981). The Biology of Seaweeds. Botanical Monograph Series 17. University of California Press. p. 88. ISBN 9780520045859.
  26. ^ Li L, Wang S, Wang H, Sahu SK, Marin B, Li H, et al. (September 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.
  27. ^ Pombert JF, Otis C, Lemieux C, Turmel M (September 2005). "The chloroplast genome sequence of the green alga Pseudendoclonium akinetum (Ulvophyceae) reveals unusual structural features and new insights into the branching order of chlorophyte lineages". Molecular Biology and Evolution. 22 (9): 1903–18. doi:10.1093/molbev/msi182. PMID 15930151.
  28. ^ Jump up to: a b c d e Mattox KR, Stewart KD, et al. (The Systematics Association) (1984). "Classification of the green algae: a concept based on comparative cytology.". In Irvine DE, John DM (eds.). The systematics of Green Algae. Vol. 27. London: Academic Press. pp. 29–72.
  29. ^ Bold HC, Wynne MJ (1985). Introduction to the algae : structure and reproduction (2nd ed.). Englewood Cliffs, N.J.: Prentice-Hall. ISBN 978-0-13-477746-7.
  30. ^ Round FE (1971). "The taxonomy of the Chlorophyta, 2". Br. Phycol. J. 6 (2): 235–264. doi:10.1080/00071617100650261.
  31. ^ McCall R (2020-02-24). "Billion-year-old green algae found in China is the oldest ever discovered". Newsweek. Retrieved 2020-02-25.
  32. ^ Sandhya Ramesh (2020-02-25). "Scientists discover world's oldest green algae fossil in China". ThePrint. Retrieved 2020-02-25.

Further reading

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Wikispecies has information related to Chlorophyta.
Wikimedia Commons has media related to Chlorophyta.
  • Burrows EM (1991). Seaweeds of the British Isles. Vol. 2 (Chlorophyta). London: Natural History Museum. ISBN 978-0-565-00981-6.
  • Lewis LA, McCourt RM (October 2004). "Green algae and the origin of land plants". American Journal of Botany. 91 (10): 1535–56. doi:10.3732/ajb.91.10.1535. PMID 21652308.
  • Pickett-Heaps JD (1975). Green Algae. Structure, Reproduction and Evolution in Selected Genera. Stamford, CT: Sinauer Assoc. p. 606.
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