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Cyclic electron flow and light partitioning between the two photosystems in leaves of plants with different functional types

Sagun, Julius Ver; Badger, Murray; Chow, Wah Soon; Ghannoum, Oula

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Cyclic electron flow (CEF) around photosystem I (PSI) is essential for generating additional ATP and enhancing efficient photosynthesis. Accurate estimation of CEF requires knowledge of the fractions of absorbed light by PSI (fI) and PSII (fII), which are only known for a few model species such as spinach. No measures of fI are available for C4 grasses under different irradiances. We developed a new method to estimate (1) fII in vivo by concurrently measuring linear electron flux through both...[Show more]

dc.contributor.authorSagun, Julius Ver
dc.contributor.authorBadger, Murray
dc.contributor.authorChow, Wah Soon
dc.contributor.authorGhannoum, Oula
dc.date.accessioned2021-04-20T04:12:15Z
dc.date.available2021-04-20T04:12:15Z
dc.identifier.issn0166-8595
dc.identifier.urihttp://hdl.handle.net/1885/230407
dc.description.abstractCyclic electron flow (CEF) around photosystem I (PSI) is essential for generating additional ATP and enhancing efficient photosynthesis. Accurate estimation of CEF requires knowledge of the fractions of absorbed light by PSI (fI) and PSII (fII), which are only known for a few model species such as spinach. No measures of fI are available for C4 grasses under different irradiances. We developed a new method to estimate (1) fII in vivo by concurrently measuring linear electron flux through both photosystems (LEFO2) in leaf using membrane inlet mass spectrometry (MIMS) and total electron flux through PSII (ETR2) using chlorophyll fluorescence by a Dual-PAM at low light and (2) CEF as ETR1—LEFO2. For a C3 grass, fI was 0.5 and 0.4 under control (high light) and shade conditions, respectively. C4 species belonging to NADP-ME and NAD-ME subtypes had fI of 0.6 and PCK subtype had 0.5 under control. All shade-grown C4 species had fI of 0.6 except for NADP-ME grass which had 0.7. It was also observed that fI ranged between 0.3 and 0.5 for gymnosperm, liverwort and fern species. CEF increased with irradiance and was induced at lower irradiances in C4 grasses and fern relative to other species. CEF was greater in shade-grown plants relative to control plants except for C4 NADP-ME species. Our study reveals a range of CEF and fI values in different plant functional groups. This variation must be taken into account for improved photosynthetic calculations and modelling.
dc.description.sponsorshipJVS gratefully acknowledges the award of a Higher Degree Research Scholarship funded through the Centre of Excellence for Translational Photosynthesis and Western Sydney University
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherKluwer Academic Publishers
dc.rights© The Author(s) 2019
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.sourcePhotosynthesis Research
dc.source.urihttps://link.springer.com/article/10.1007/s11120-019-00666-1
dc.subjectC4 photosynthesis
dc.subjectChlorophyll fuorescence
dc.subjectCyclic electron fux
dc.subjectElectron transport rate
dc.subjectOxygen exchange rate
dc.subjectPhotosystem
dc.titleCyclic electron flow and light partitioning between the two photosystems in leaves of plants with different functional types
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume142
dc.date.issued2019
local.identifier.absfor060705 - Plant Physiology
local.identifier.ariespublicationu5786633xPUB1316
local.publisher.urlhttps://link.springer.com
local.type.statusPublished Version
local.contributor.affiliationSagun, Julius Ver, Western Sydney University
local.contributor.affiliationBadger, Murray, College of Science, ANU
local.contributor.affiliationChow, Wah, College of Science, ANU
local.contributor.affiliationGhannoum, Oula, University of Western Sydney
dc.relationhttp://purl.org/au-research/grants/arc/CE140100015
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage321
local.bibliographicCitation.lastpage334
local.identifier.doi10.1007/s11120-019-00666-1
local.identifier.absseo829999 - Plant Production and Plant Primary Products not elsewhere classified
dc.date.updated2020-11-22T07:53:06Z
local.identifier.thomsonIDWOS:000501449900005
dcterms.accessRightsopen access
dc.provenanceThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativeco mmons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
dc.rights.licenseCreative Commons Attribution licence
CollectionsANU Research Publications

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