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The rate coefficient of repair of photosystem II after photoinactivation

Hie, J; Chow, Wah S (Fred)

Description

During photosynthesis, photoinactivation and repair of photosystem II (PSII) occur simultaneously, resulting in a net loss of functional PSII under a given irradiance. This study determines the rate coefficients for the partial processes, allowing the calculation of the partial rates at any concentration of functional/non-functional PSII. The rate coefficient of photoinactivation was obtained from the onset of photoinactivation of PSII in leaf segments of Capsicum annuum L. in the absence of...[Show more]

dc.contributor.authorHie, J
dc.contributor.authorChow, Wah S (Fred)
dc.date.accessioned2015-12-13T23:08:04Z
dc.date.available2015-12-13T23:08:04Z
dc.identifier.issn0031-9317
dc.identifier.urihttp://hdl.handle.net/1885/86499
dc.description.abstractDuring photosynthesis, photoinactivation and repair of photosystem II (PSII) occur simultaneously, resulting in a net loss of functional PSII under a given irradiance. This study determines the rate coefficients for the partial processes, allowing the calculation of the partial rates at any concentration of functional/non-functional PSII. The rate coefficient of photoinactivation was obtained from the onset of photoinactivation of PSII in leaf segments of Capsicum annuum L. in the absence of repair, and was in turn used to obtain the rate coefficient (kr) of repair of PSII when repair was occurring. The value of kr was found to be near maximum at an irradiance as low as 29 μmol photons m-2s-1 and peaked at or somewhat above the growth irradiance; however, it declined on further increasing the irradiance, possibly due to oxidative stress. The value of kr was considerably decreased by elevating the CO2 to about 1%, particularly at low irradiance, probably due to acidification of the stroma to a pH outside the range that is optimal for protein synthesis. The method of determining kr is convenient to apply, not relying on radio-labelling and pulse-chase experiments.
dc.publisherBlackwell Publishing Ltd
dc.sourcePhysiologia Plantarum
dc.subjectKeywords: Oxidation; Photons; Rate constants; Stress analysis; Synthesis (chemical); Photoinactivation; Photosynthesis; Capsicum; Capsicum annuum
dc.titleThe rate coefficient of repair of photosystem II after photoinactivation
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume118
dc.date.issued2003
local.identifier.absfor060705 - Plant Physiology
local.identifier.ariespublicationMigratedxPub15399
local.type.statusPublished Version
local.contributor.affiliationHie, J, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationChow, Wah S (Fred), College of Medicine, Biology and Environment, ANU
local.bibliographicCitation.startpage297
local.bibliographicCitation.lastpage304
local.identifier.doi10.1034/j.1399-3054.2003.00107.x
dc.date.updated2015-12-12T08:12:07Z
local.identifier.scopusID2-s2.0-0037904998
CollectionsANU Research Publications

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