Acaryochloris marina

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Acaryochloris marina
Scientific classification
Kingdom:
Phylum:
Order:
Family:
Acaryochloridaceae

Komárek et al. 2014[1]
Genus:
Acaryochloris

Miyashita & Chihara 2003[2]
Species:
A. marina
Binomial name
Acaryochloris marina
Miyashita & Chihara 2003[2]

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Acaryochloris marina is a symbiotic species of the phylum Cyanobacteria that produces Chlorophyll d, allowing it to utilise far-red light, at 710 nm wavelength.[3]

Description

It was first discovered in 1993 from coastal isolates of coral in the Republic of Palau in the west Pacific Ocean and announced in 1996.[4] Despite the claim on the 1996 Nature paper that its formal description was to be published shortly thereafter,[4] a tenatitive partial description was presented in 2003 due to phylogenetic issues (deep branching cyanobacterium).[2]

Genome

Its genome was sequenced in 2008, revealing a large bacterial genome of 8.3 Mb with 9 plasmids.[3]

Etymology

The name Acaryochloris is a combination of the Greek prefix a (ἄν)[5] meaning "without", the (neuter) noun caryo (κάρυον)[6] meaning "nut" (here intended as "nucleus") and the adjective chloros (χλωρός)[7] meaning "green" (or more correctly the feminine Neolatin noun N.L. chloris);[8] therefore the medieval Latin [sic. in,[2] it is Neolatin] feminine noun Acaryochloris means "without nucleus green".[2] The specific epithet marina is a Latin feminine adjective meaning "marine".[2]

Classification

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Due to historical reason, the classification of Cyanobacteria is problematic and many cyanobacteria are not validly published, meaning they have not yet been placed into the classification framework.[9] One of these not officially recognised species is Acaryochloris marina, which technically should be written as "Acaryochloris marina" in official writings, but in effect this is rarely done (cf.[3][10])

Exoplanet Habitability

Scientists including NASA's Nancy Kiang have proposed that the existence of Acaryochloris marina suggests that organisms that use Chlorophyll d, rather than Chlorophyll a, may be able to perform oxygenic photosynthesis on exoplanets orbiting red dwarf stars (which emit much less light than the Sun).[11][12] Because approximately 70 percent of the stars in the Milky Way galaxy are red dwarfs,[13] the existence of Acaryochloris marina implies that oxygenic photosynthesis may be occurring on far more exoplanets than astrobiologists initially thought possible.

See also

References

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  4. 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
  5. ἄν. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
  6. κάρυον. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
  7. χλωρός. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
  8. Gender of suffices entry in LPSN [Lua error in package.lua at line 80: module 'strict' not found.]
  9. Classification of Cyanobacteria entry in LPSN [Lua error in package.lua at line 80: module 'strict' not found.]
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