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Utilization of O2 in the metabolic optimization of C4 photosynthesis

dc.contributor.authorMaroco, João
dc.contributor.authorKu, Maurice S. B.
dc.contributor.authorEdwards, Gerald E.
dc.date.accessioned2012-09-22T10:47:44Z
dc.date.available2012-09-22T10:47:44Z
dc.date.issued2000
dc.description.abstractThe combined effects of O2 on net rates of photosynthesis, photosystem II activity, steady-state pool size of key metabolites of photosynthetic metabolism in the C4 pathway, C3 pathway and C2 photorespiratory cycle and on growth were evaluated in the C4 species Amaranthus edulis and the C3 species Flaveria pringlei. Increasing O2 reduced net CO2 assimilation in F. pringlei due to an increased flux of C through the photorespiratory pathway. However, in A. edulis increasing O2 up to 5–10% stimulated photosynthesis. Analysis of the pool size of key metabolites in A. edulis suggests that while there is some O2 dependent photorespiration, O2 is required for maximizing C4 cycle activity to concentrate CO2 in bundle sheath cells. Therefore, the response of net photosynthesis to O2 in C4 plants may result from the balance of these two opposing effects. Under 21 versus 5% O2, growth of A. edulis was stimulated about 30% whereas that of F. pringlei was inhibited about 40%.por
dc.identifier.citationPlant, Cell and Environmen, 23, 115-121por
dc.identifier.issn0140-7791
dc.identifier.urihttp://hdl.handle.net/10400.12/1718
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherWiley-Blackwellpor
dc.subjectAmaranthus edulispor
dc.subjectFlaveria pringleipor
dc.subjectClimate changepor
dc.subjectC4 photosynthesispor
dc.subjectoxygen requirementpor
dc.titleUtilization of O2 in the metabolic optimization of C4 photosynthesispor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceOxfordpor
oaire.citation.endPage121por
oaire.citation.startPage115por
oaire.citation.titlePlant, Cell and Environmentpor
oaire.citation.volume23por
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor

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