Biology:Red algae

From HandWiki
Short description: Division of plant life

Red algae
Temporal range: Mesoproterozoic–present[1][2]
Chondrus crispus - Köhler–s Medizinal-Pflanzen-034.jpg
A-D : Chondrus crispus Stackhouse,
E-F : Mastocarpus stellatus J.Ag.
Scientific classification e
Domain: Eukaryota
Clade: Diaphoretickes
(unranked): Archaeplastida
Division: Rhodophyta
Wettstein, 1922
Clades

Red algae, or Rhodophyta (/roʊˈdɒfɪtə/, /ˌroʊdəˈfaɪtə/; from grc ῥόδον (rhódon) 'rose', and φυτόν (phutón) 'plant'), are one of the oldest groups of eukaryotic algae.[3] The Rhodophyta comprises one of the largest phyla of algae, containing over 7,000 currently recognized species with taxonomic revisions ongoing.[4] The majority of species (6,793) are found in the Florideophyceae (class), and mostly consist of multicellular, marine algae, including many notable seaweeds.[4][5] Red algae are abundant in marine habitats but relatively rare in freshwaters.[6] Approximately 5% of red algae species occur in freshwater environments, with greater concentrations found in warmer areas.[7] Except for two coastal cave dwelling species in the asexual class Cyanidiophyceae, there are no terrestrial species, which may be due to an evolutionary bottleneck in which the last common ancestor lost about 25% of its core genes and much of its evolutionary plasticity.[8][9]

The red algae form a distinct group characterized by having eukaryotic cells without flagella and centrioles, chloroplasts that lack external endoplasmic reticulum and contain unstacked (stroma) thylakoids, and use phycobiliproteins as accessory pigments, which give them their red color.[10] But despite their name, red algae can vary greatly in color from bright green, soft pink, resembling brown algae, to shades of red and purple, and may be almost black at greater depths.[11][12] Unlike green algae, red algae store sugars outside the chloroplasts as floridean starch, a type of starch that consists of highly branched amylopectin without amylose,[13] as food reserves outside their plastids. Most red algae are also multicellular, macroscopic, marine, and reproduce sexually. The life history of red algae is typically an alternation of generations that may have three generations rather than two.[14] The coralline algae, which secrete calcium carbonate and play a major role in building coral reefs, belong here. Red algae such as Palmaria palmata (dulse) and Porphyra species (laver/nori/gim) are a traditional part of European and Asian cuisines and are used to make other products such as agar, carrageenans and other food additives.[15]

Evolution

Botryocladia occidentalis scale bar: 2 cm

Chloroplasts probably evolved following an endosymbiotic event between an ancestral, photosynthetic cyanobacterium and an early eukaryotic phagotroph.[16] This event (termed primary endosymbiosis) is at the origin of the red and green algae (including the land plants or Embryophytes which emerged within them)) and the glaucophytes, which together make up the oldest evolutionary lineages of photosynthetic eukaryotes, the Archaeplastida.[17] A secondary endosymbiosis event involving an ancestral red alga and a heterotrophic eukaryote resulted in the evolution and diversification of several other photosynthetic lineages such as Cryptophyta, Haptophyta, Stramenopiles (or Heterokontophyta), and Alveolata.[17] In addition to multicellular brown algae, it is estimated that more than half of all known species of microbial eukaryotes harbor red-alga-derived plastids.[18]

Red algae are divided into the Cyanidiophyceae, a class of unicellular and thermoacidophilic extremophiles found in sulphuric hot springs and other acidic environments,[19] an adaptation partly made possible by horizontal gene transfers from prokaryotes,[20] with about 1% of their genome having this origin,[21] and two sister clades called SCRP (Stylonematophyceae, Compsopogonophyceae, Rhodellophyceae and Porphyridiophyceae) and BF (Bangiophyceae and Florideophyceae), which are found in both marine and freshwater environments. The SCRP clade are microalgae, consisting of both unicellular forms and multicellular microscopic filaments and blades. The BF are macroalgae, seaweed that usually do not grow to more than about 50 cm in length, but a few species can reach lengths of 2 m.[22] Most rhodophytes are marine with a worldwide distribution, and are often found at greater depths compared to other seaweeds. While this was formerly attributed to the presence of pigments (such as phycoerythrin) that would permit red algae to inhabit greater depths than other macroalgae by chromatic adaption, recent evidence calls this into question (e.g. the discovery of green algae at great depth in the Bahamas).[23] Some marine species are found on sandy shores, while most others can be found attached to rocky substrata.[24] Freshwater species account for 5% of red algal diversity, but they also have a worldwide distribution in various habitats;[7] they generally prefer clean, high-flow streams with clear waters and rocky bottoms, but with some exceptions.[25] A few freshwater species are found in black waters with sandy bottoms [26] and even fewer are found in more lentic waters.[27] Both marine and freshwater taxa are represented by free-living macroalgal forms and smaller endo/epiphytic/zoic forms, meaning they live in or on other algae, plants, and animals.[10] In addition, some marine species have adopted a parasitic lifestyle and may be found on closely or more distantly related red algal hosts.[28][29]

Taxonomy

In the classification system of Adl et al. 2005, the red algae are classified in the Archaeplastida, along with the glaucophytes and the green algae plus land plants (Viridiplantae or Chloroplastida). The authors use a hierarchical arrangement where the clade names do not signify rank; the class name Rhodophyceae is used for the red algae. No subdivisions are given; the authors say, "Traditional subgroups are artificial constructs, and no longer valid."[30] Many subsequent studies provided evidence that is in agreement for monophyly in the Archaeplastida (including red algae).[31][32][33][34] However, other studies have suggested Archaeplastida is paraphyletic.[35][36] (As of January 2011), the situation appears unresolved.[clarification needed]

Below are other published taxonomies of the red algae using molecular and traditional alpha taxonomic data; however, the taxonomy of the red algae is still in a state of flux (with classification above the level of order having received little scientific attention for most of the 20th century).[37]

  • If the kingdom Plantae is defined as the Archaeplastida, then red algae will be part of that group.
  • If Plantae are defined more narrowly, to be the Viridiplantae, then the red algae might be excluded.

A major research initiative to reconstruct the Red Algal Tree of Life (RedToL) using phylogenetic and genomic approach is funded by the National Science Foundation as part of the Assembling the Tree of Life Program.

Classification comparison

Classification system according to
Saunders and Hommersand 2004[37] 		Classification system according to
Hwan Su Yoon et al. 2006[38] 		Orders Multicelluar? Pit plugs? Example
  • Subkingdom Rhodoplantae
Cyanidiales No No Cyanidioschyzon merolae
  • Phylum Rhodophyta Wettstein
    • Subphylum Rhodellophytina
      • Class Rhodellophyceae Cavalier-Smith
  • Subphylum Rhodophytina subphylum novus
    • Class Rhodellophyceae Cavalier-Smith
 Rhodellales No No Rhodella
Compsopogonales, Rhodochaetales, Erythropeltidales Yes No Compsopogon
Rufusiales, Stylonematales Yes No Stylonema

Bangiales

Yes Yes Bangia, "Porphyra"

Porphyridiales

No No Porphyridium cruentum
Hildenbrandiales Yes Yes Hildenbrandia
Batrachospermales, Balliales, Balbianiales, Nemaliales, Colaconematales, Acrochaetiales, Palmariales, Thoreales Yes Yes Nemalion
Rhodogorgonales, Corallinales Yes Yes Corallina officinalis
  • Subclass Ahnfeltiophycidae
 Ahnfeltiales, Pihiellales Yes Yes Ahnfeltia
Bonnemaisoniales, Gigartinales, Gelidiales, Gracilariales, Halymeniales, Rhodymeniales, Nemastomatales, Plocamiales, Ceramiales Yes Yes Gelidium

Some sources (such as Lee) place all red algae into the class "Rhodophyceae". (Lee's organization is not a comprehensive classification, but a selection of orders considered common or important.[39])

A subphylum - Proteorhodophytina - has been proposed to encompass the existing classes Compsopogonophyceae, Porphyridiophyceae, Rhodellophyceae and Stylonematophyceae.[40] This proposal was made on the basis of the analysis of the plastid genomes.


Species of red algae

Over 7,000 species are currently described for the red algae,[4] but the taxonomy is in constant flux with new species described each year.[37][38] The vast majority of these are marine with about 200 that live only in fresh water.

Some examples of species and genera of red algae are:

Morphology

Red algal morphology is diverse ranging from unicellular forms to complex parenchymatous and non- parenchymatous thallus.[41] Red algae have double cell walls.[42] The outer layers contain the polysaccharides agarose and agaropectin that can be extracted from the cell walls as agar by boiling.[42] The internal walls are mostly cellulose.[42] They also have the most gene-rich plastid genomes known.[43]

Cell structure

Red algae do not have flagella and centrioles during their entire life cycle. The distinguishing characters of red algal cell structure include the presence of normal spindle fibres, microtubules, un-stacked photosynthetic membranes, phycobilin pigment granules,[44] pit connection between cells, filamentous genera, and the absence of chloroplast endoplasmic reticulum.[45]

Chloroplasts

The presence of the water-soluble pigments called phycobilins (phycocyanobilin, phycoerythrobilin, phycourobilin and phycobiliviolin), which are localized into phycobilisomes, gives red algae their distinctive color.[46] Their chloroplasts contain evenly spaced and ungrouped thylakoids[47] and contain the pigments chlorophyll a, α- and β-carotene, lutein and zeaxanthin. Their chloroplasts are enclosed in a double membrane, lack grana and phycobilisomes on the stromal surface of the thylakoid membrane.[48]

Storage products

The major photosynthetic products include floridoside (major product), D‐isofloridoside, digeneaside, mannitol, sorbitol, dulcitol etc.[49] Floridean starch (similar to amylopectin in land plants), a long-term storage product, is deposited freely (scattered) in the cytoplasm.[50] The concentration of photosynthetic products are altered by the environmental conditions like change in pH, the salinity of medium, change in light intensity, nutrient limitation etc.[51] When the salinity of the medium increases the production of floridoside is increased in order to prevent water from leaving the algal cells.

Pit connections and pit plugs

Main page: Biology:Pit connection

Pit connections

Pit connections and pit plugs are unique and distinctive features of red algae that form during the process of cytokinesis following mitosis.[52][53] In red algae, cytokinesis is incomplete. Typically, a small pore is left in the middle of the newly formed partition. The pit connection is formed where the daughter cells remain in contact.

Shortly after the pit connection is formed, cytoplasmic continuity is blocked by the generation of a pit plug, which is deposited in the wall gap that connects the cells.

Connections between cells having a common parent cell are called primary pit connections. Because apical growth is the norm in red algae, most cells have two primary pit connections, one to each adjacent cell.

Connections that exist between cells not sharing a common parent cell are labelled secondary pit connections. These connections are formed when an unequal cell division produced a nucleated daughter cell that then fuses to an adjacent cell. Patterns of secondary pit connections can be seen in the order Ceramiales.[53]

Pit plugs

After a pit connection is formed, tubular membranes appear. A granular protein called the plug core then forms around the membranes. The tubular membranes eventually disappear. While some orders of red algae simply have a plug core, others have an associated membrane at each side of the protein mass, called cap membranes. The pit plug continues to exist between the cells until one of the cells dies. When this happens, the living cell produces a layer of wall material that seals off the plug.

Function

The pit connections have been suggested to function as structural reinforcement, or as avenues for cell-to-cell communication and transport in red algae, however little data supports this hypothesis.[54]

Reproduction

The reproductive cycle of red algae may be triggered by factors such as day length.[3] Red algae reproduce sexually as well as asexually. Asexual reproduction can occur through the production of spores and by vegetative means (fragmentation, cell division or propagules production).[55]

Fertilization

Red algae lack motile sperm. Hence, they rely on water currents to transport their gametes to the female organs – although their sperm are capable of "gliding" to a carpogonium's trichogyne.[3] Animals also help with the dispersal and fertilization of the gametes. The first species discovered to do so is the isopod Idotea balthica.[56]

The trichogyne will continue to grow until it encounters a spermatium; once it has been fertilized, the cell wall at its base progressively thickens, separating it from the rest of the carpogonium at its base.[3]

Upon their collision, the walls of the spermatium and carpogonium dissolve. The male nucleus divides and moves into the carpogonium; one half of the nucleus merges with the carpogonium's nucleus.[3]

The polyamine spermine is produced, which triggers carpospore production.[3]

Spermatangia may have long, delicate appendages, which increase their chances of "hooking up".[3]

Life cycle

They display alternation of generations. In addition to a gametophyte generation, many have two sporophyte generations, the carposporophyte-producing carpospores, which germinate into a tetrasporophyte – this produces spore tetrads, which dissociate and germinate into gametophytes.[3] The gametophyte is typically (but not always) identical to the tetrasporophyte.[57]

Carpospores may also germinate directly into thalloid gametophytes, or the carposporophytes may produce a tetraspore without going through a (free-living) tetrasporophyte phase.[57] Tetrasporangia may be arranged in a row (zonate), in a cross (cruciate), or in a tetrad.[3]

The carposporophyte may be enclosed within the gametophyte, which may cover it with branches to form a cystocarp.[57]

The two following case studies may be helpful to understand some of the life histories algae may display:

In a simple case, such as Rhodochorton investiens:

In the carposporophyte: a spermatium merges with a trichogyne (a long hair on the female sexual organ), which then divides to form carposporangia – which produce carpospores.
Carpospores germinate into gametophytes, which produce sporophytes. Both of these are very similar; they produce monospores from monosporangia "just below a cross-wall in a filament"[3] and their spores are "liberated through the apex of sporangial cell."[3]
The spores of a sporophyte produce either tetrasporophytes. Monospores produced by this phase germinates immediately, with no resting phase, to form an identical copy of the parent. Tetrasporophytes may also produce a carpospore, which germinates to form another tetrasporophyte.[verification needed][3]
The gametophyte may replicate asexually using monospores, but also produces nonmotile sperm in spermatangia, and a lower, nucleus-containing "egg" region of the carpogonium.[3][58]

A rather different example is Porphyra gardneri:

In its diploid phase, a carpospore can germinate to form a filamentous "conchocelis stage", which can also self-replicate using monospores. The conchocelis stage eventually produces conchosporangia. The resulting conchospore germinates to form a tiny prothallus with rhizoids, which develops to a cm-scale leafy thallus. This too can reproduce via monospores, which are produced inside the thallus itself.[3] They can also reproduce via spermatia, produced internally, which are released to meet a prospective carpogonium in its conceptacle.[3]

Chemistry

Algal group δ13C range[59]
HCO3-using red algae −22.5‰ to −9.6‰
CO2-using red algae −34.5‰ to −29.9‰
Brown algae −20.8‰ to −10.5‰
Green algae −20.3‰ to −8.8‰

The δ13C values of red algae reflect their lifestyles. The largest difference results from their photosynthetic metabolic pathway: algae that use HCO3 as a carbon source have less negative δ13C values than those that only use CO
2.[59] An additional difference of about 1.71‰ separates groups intertidal from those below the lowest tide line, which are never exposed to atmospheric carbon. The latter group uses the more 13C-negative CO
2 dissolved in sea water, whereas those with access to atmospheric carbon reflect the more positive signature of this reserve.

Photosynthetic pigments of Rhodophyta are chlorophylls a and d. Red algae are red due to phycoerythrin. They contain the sulfated polysaccharide carrageenan in the amorphous sections of their cell walls, although red algae from the genus Porphyra contain porphyran. They also produce a specific type of tannin called phlorotannins, but in a lower amount than brown algae do.

Genomes and transcriptomes of red algae

As enlisted in realDB,[60] 27 complete transcriptomes and 10 complete genomes sequences of red algae are available. Listed below are the 10 complete genomes of red algae.

Fossil record

One of the oldest fossils identified as a red alga is also the oldest fossil eukaryote that belongs to a specific modern taxon. Bangiomorpha pubescens, a multicellular fossil from arctic Canada , strongly resembles the modern red alga Bangia and occurs in rocks dating to 1.05 billion years ago.[2]

Two kinds of fossils resembling red algae were found sometime between 2006 and 2011 in well-preserved sedimentary rocks in Chitrakoot, central India. The presumed red algae lie embedded in fossil mats of cyanobacteria, called stromatolites, in 1.6 billion-year-old Indian phosphorite – making them the oldest plant-like fossils ever found by about 400 million years.[72]

Red algae are important builders of limestone reefs. The earliest such coralline algae, the solenopores, are known from the Cambrian period. Other algae of different origins filled a similar role in the late Paleozoic, and in more recent reefs.

Calcite crusts that have been interpreted as the remains of coralline red algae, date to the Ediacaran Period.[73] Thallophytes resembling coralline red algae are known from the late Proterozoic Doushantuo formation.[74]

Relationship to other algae

Chromista and Alveolata algae (e.g., chrysophytes, diatoms, phaeophytes, dinophytes) seem to have evolved from bikonts that have acquired red algae as endosymbionts. According to this theory, over time these endosymbiont red algae have evolved to become chloroplasts. This part of endosymbiotic theory is supported by various structural and genetic similarities.[75]

Human consumption

Red algae have a long history of use as a source of nutritional, functional food ingredients and pharmaceutical substances.[76] They are a source of antioxidants including polyphenols, and phycobiliproteinsLua error: not enough memory. and contain proteins, minerals, trace elements, vitamins and essential fatty acids.[77][78] Traditionally red algae are eaten raw, in salads, soups, meal and condiments. Several species are food crops, in particular dulse (Palmaria palmata)[79] and members of the genus Porphyra, variously known as nori (Japan), gim (Korea), Lua error: Internal error: The interpreter exited with status 1. Lua error: Internal error: The interpreter exited with status 1. (China), and laver (British Isles).[80] Some of the red algal species like Gracilaria and Laurencia are rich in polyunsaturated fatty acids (eicopentaenoic acid, docohexaenoic acid, arachidonic acid)[81] and have protein content up to 47% of total biomass.[76] Where a big portion of world population is getting insufficient daily iodine intake, a 150 ug/day requirement of iodine is obtained from a single gram of red algae.[82] Red algae, like Gracilaria, Gelidium, Euchema, Porphyra, Acanthophora, and Palmaria are primarily known for their industrial use for phycocolloids (agar, algin, furcellaran and carrageenan) as thickening agent, textiles, food, anticoagulants, water-binding agents etc.[83] Dulse (Palmaria palmata) is one of the most consumed red algae and is a source of iodine, protein, magnesium and calcium.[84] China, Japan, Republic of Korea are the top producers of seaweeds.[85] In East and Southeast Asia, agar is most commonly produced from Gelidium amansii. These rhodophytes are easily grown and, for example, nori cultivation in Japan goes back more than three centuries.Lua error: Internal error: The interpreter exited with status 1.

Gallery

Rhodophyta (red algae)

See also

References

  1. ↑ N. J. Butterfield (2000). "Bangiomorpha pubescens n. gen., n. sp.: implications for the evolution of sex, multicellularity, and the Mesoproterozoic/Neoproterozoic radiation of eukaryotes". Paleobiology 26 (3): 386–404. doi:10.1666/0094-8373(2000)026<0386:BPNGNS>2.0.CO;2. ISSN 0094-8373. http://paleobiol.geoscienceworld.org/cgi/content/abstract/26/3/386. 
  2. ↑ 2.0 2.1 T.M. Gibson (2018). "Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis". Geology 46 (2): 135–138. doi:10.1130/G39829.1. Bibcode: 2018Geo....46..135G. https://pubs.geoscienceworld.org/gsa/geology/article/46/2/135/524864/Precise-age-of-Bangiomorpha-pubescens-dates-the. 
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 Lee, R.E. (2008). Phycology (4th ed.). Cambridge University Press. ISBN 978-0-521-63883-8. https://archive.org/details/phycology00robe. 
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  8. ↑ Why don't we live on a red planet?
  9. ↑ Azua-Bustos, A; González-Silva, C; Arenas-Fajardo, C; Vicuña, R (2012). "Extreme environments as potential drivers of convergent evolution by exaptation: the Atacama Desert Coastal Range case". Front Microbiol 3: 426. doi:10.3389/fmicb.2012.00426. PMID 23267354. 
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  11. ↑ Campbell Biology Australian and New Zealand Edition
  12. ↑ Introduction to the Biology of Marine Life
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  16. ↑ Gould, S.B.; Waller, R.F.; McFadden, G.I. (2008). "Plastid Evolution". Annual Review of Plant Biology 59: 491–517. doi:10.1146/annurev.arplant.59.032607.092915. PMID 18315522. 
  17. ↑ 17.0 17.1 McFadden, G.I. (2001). "Primary and Secondary Endosymbiosis and the Evolution of Plastids". Journal of Phycology 37 (6): 951–959. doi:10.1046/j.1529-8817.2001.01126.x. 
  18. ↑ Steal My Sunshine | The Scientist Magazine
  19. ↑ Ciniglia, C.; Yoon, H.; Pollio, A.; Bhattacharya, D. (2004). "Hidden biodiversity of the extremophilic Cyanidiales red algae". Molecular Ecology 13 (7): 1827–1838. doi:10.1111/j.1365-294X.2004.02180.x. PMID 15189206. Bibcode: 2004MolEc..13.1827C. 
  20. ↑ Plants and animals sometimes take genes from bacteria, study of algae suggests - Sciencemag.org
  21. ↑ The genomes of polyextremophilic cyanidiales contain 1% horizontally transferred genes with diverse adaptive functions
  22. ↑ Brawley, SH (2017). "Insights into the red algae and eukaryotic evolution from the genome of Porphyra umbilicalis (Bangiophyceae, Rhodophyta)". Proceedings of the National Academy of Sciences of the United States of America 114 (31): E6361–E6370. doi:10.1073/pnas.1703088114. PMID 28716924. Bibcode: 2017PNAS..114E6361B. 
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  25. ↑ Eloranta, P.; Kwandrans, J. (2004). "Indicator value of freshwater red algae in running waters for water quality assessment". International Journal of Oceanography and Hydrobiology XXXIII (1): 47–54. ISSN 1730-413X. http://www.oandhs.org/files/60.pdf. 
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  29. ↑ Salomaki, E.D.; Lane, C.E. (2014). "Are all red algal parasites cut from the same cloth?". Acta Societatis Botanicorum Poloniae 83 (4): 369–375. doi:10.5586/asbp.2014.047. 
  30. ↑ Adl, Sina M. (2005). "The New Higher Level Classification of Eukaryotes with Emphasis on the Taxonomy of Protists". Journal of Eukaryotic Microbiology 52 (5): 399–451. doi:10.1111/j.1550-7408.2005.00053.x. PMID 16248873. 
  31. ↑ Fabien Burki; Kamran Shalchian-Tabrizi; Marianne Minge; Åsmund Skjæveland; Sergey I. Nikolaev; Kjetill S. Jakobsen; Jan Pawlowski (2007). Butler, Geraldine. ed. "Phylogenomics Reshuffles the Eukaryotic Supergroups". PLOS ONE 2 (8): e790. doi:10.1371/journal.pone.0000790. PMID 17726520. Bibcode: 2007PLoSO...2..790B. 
  32. ↑ Burki, Fabien; Inagaki, Yuji; Bråte, Jon; Archibald, John M.; Keeling, Patrick J.; Cavalier-Smith, Thomas; Sakaguchi, Miako; Hashimoto, Tetsuo et al. (2009). "Large-Scale Phylogenomic Analyses Reveal That Two Enigmatic Protist Lineages, Telonemia and Centroheliozoa, Are Related to Photosynthetic Chromalveolates". Genome Biology and Evolution 1: 231–8. doi:10.1093/gbe/evp022. PMID 20333193. 
  33. ↑ Cavalier-Smith, Thomas (2009). "Kingdoms Protozoa and Chromista and the eozoan root of the eukaryotic tree". Biology Letters 6 (3): 342–5. doi:10.1098/rsbl.2009.0948. PMID 20031978. 
  34. ↑ Rogozin, I.B.; Basu, M.K.; Csürös, M.; Koonin, E.V. (2009). "Analysis of Rare Genomic Changes Does Not Support the Unikont–Bikont Phylogeny and Suggests Cyanobacterial Symbiosis as the Point of Primary Radiation of Eukaryotes". Genome Biology and Evolution 1: 99–113. doi:10.1093/gbe/evp011. PMID 20333181. 
  35. ↑ Kim, E.; Graham, L.E.; Graham, Linda E. (2008). Redfield, Rosemary Jeanne. ed. "EEF2 analysis challenges the monophyly of Archaeplastida and Chromalveolata". PLOS ONE 3 (7): e2621. doi:10.1371/journal.pone.0002621. PMID 18612431. Bibcode: 2008PLoSO...3.2621K. 
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