Carbon

Raven, JA

Carbon

Raven, JA

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Publication Type:: Chapter
Citation:: Ecology of Cyanobacteria II: Their Diversity in Space and Time, 2012, 9789400738553 pp. 443 - 460
Issue Date:: 2012-07-01

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Field	Value	Language
dc.contributor.author	Raven, JA https://orcid.org/0000-0002-2789-3297	en_US
dc.date.issued	2012-07-01	en_US
dc.identifier.citation	Ecology of Cyanobacteria II: Their Diversity in Space and Time, 2012, 9789400738553 pp. 443 - 460	en_US
dc.identifier.isbn	9400738544	en_US
dc.identifier.isbn	9789400738546	en_US
dc.identifier.uri	http://hdl.handle.net/10453/120041
dc.description.abstract	© 2012 Springer Science+Business Media B.V. All rights reserved. Summary: All cyanobacteria are actually or potentially photolithotrophic, with the exception of a recently discovered non-auotrophic free-living diazotroph which is presumably a (photo-)organotroph. Photolithotrophy involves CO2 assimilation by Form 1A or Form 1B Rubiscos with low affinity for CO2 and a small discrimination between CO2 and O2 and, at present CO2 levels, invariably involves an inorganic carbon concentrating mechanism (CCM). About half of the cyanobacterial strains tested are facultatively photo-organotrophic, a few of which are also facultative chemo-organotrophs; the rest are obligate photolithotrophs. In the natural environment the best-established cases of photo- or chemo-organotrophy are in symbioses of diazotrophic cyanobacteria with organisms that are already photosynthetic. The quantitative contribution of dissolved organic matter to otherwise photolithotrophically growing cyanobacteria is unclear. Extent cyanobacteria are involved in both biologically mediated calcification (direct role of the organism) and biologically related calcification (indirect role of the organism). The timing of the evolution of cyanobacterial CCM is unclear: the CCM probably evolved in low-CO2 episodes in the late Neoproterozoic or the Carboniferous, with spread to all cyanobacteria in the already established major clades by horizontal gene transfer. Cyanobacteria may be the last surviving photolithotrophs as the sun emits more energy and (by whatever mechanism) there is a decreased greenhouse gas, including CO2, content, of the atmosphere.	en_US
dc.relation.ispartof	Ecology of Cyanobacteria II: Their Diversity in Space and Time	en_US
dc.relation.isbasedon	10.1007/978-94-007-3855-3_17	en_US
dc.title	Carbon	en_US
dc.type	Chapter
utslib.citation.volume	9789400738553	en_US
utslib.for	0602 Ecology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	9789400738553	en_US

Abstract:

© 2012 Springer Science+Business Media B.V. All rights reserved. Summary: All cyanobacteria are actually or potentially photolithotrophic, with the exception of a recently discovered non-auotrophic free-living diazotroph which is presumably a (photo-)organotroph. Photolithotrophy involves CO2 assimilation by Form 1A or Form 1B Rubiscos with low affinity for CO2 and a small discrimination between CO2 and O2 and, at present CO2 levels, invariably involves an inorganic carbon concentrating mechanism (CCM). About half of the cyanobacterial strains tested are facultatively photo-organotrophic, a few of which are also facultative chemo-organotrophs; the rest are obligate photolithotrophs. In the natural environment the best-established cases of photo- or chemo-organotrophy are in symbioses of diazotrophic cyanobacteria with organisms that are already photosynthetic. The quantitative contribution of dissolved organic matter to otherwise photolithotrophically growing cyanobacteria is unclear. Extent cyanobacteria are involved in both biologically mediated calcification (direct role of the organism) and biologically related calcification (indirect role of the organism). The timing of the evolution of cyanobacterial CCM is unclear: the CCM probably evolved in low-CO2 episodes in the late Neoproterozoic or the Carboniferous, with spread to all cyanobacteria in the already established major clades by horizontal gene transfer. Cyanobacteria may be the last surviving photolithotrophs as the sun emits more energy and (by whatever mechanism) there is a decreased greenhouse gas, including CO2, content, of the atmosphere.

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http://hdl.handle.net/10453/120041