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Influence of transient shade periods on the effects of drought on photosynthesis, carbohydrate accumulation and lipid peroxidation in sunflower leaves

2006Journal article Open access
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dc.contributor.authorCorreia, Maria João
dc.contributor.authorOsório, Maria Leonor
dc.contributor.authorOsório, Júlio
dc.contributor.authorBarrote, Isabel
dc.contributor.authorMartins, Mónica
dc.contributor.authorDavid, Maria Manuela
dc.date.accessioned2012-04-19T13:21:20Z
dc.date.available2012-04-19T13:21:20Z
dc.date.issued2006
dc.date.updated2012-04-12T15:04:32Z
dc.description.abstractThe effects of a slow-imposing two-weeks soil drying period, and subsequent re-watering, on leaf water potential (Ψ), gas exchange rates, chlorophyll fluorescence and on the concentrations of malondialdehyde (MDA) and non-structural carbohydrates (starch, hexose and sucrose) were determined in mature leaves of sunflower plants growing under controlled environmental conditions. To assess how transient shade periods, associated with increased cloud cover, may influence drought-induced effects on carbon assimilation, measurements were carried out both in plants kept under the photosynthetic photon flux density (PPFD) prevailing during the growth period and stress imposition (750 μmol m-2 s-1), and in plants subjected to a 5 hours-long period under a lower PPFD (200 μmol m-2 s-1). In plants kept under high PPFD, Ψ, stomatal conductance (g), net CO2 uptake rate (A), the quantum yield of photosystem II electron transport (Φe), the photochemical efficiency of open PSII reaction centres (Fv’/Fm’) and * Corresponding author. Tel: +351 289800932; fax: +351 289818419. E-mail address: jcorreia@ualg.pt (M.J. Correia) 1 the diurnal accumulation of total non-structural carbohydrates (TNC) were significantly depressed at the end of the soil drying period, whereas non-photochemical quenching (NPQ), the concentrations of MDA and the predawn pools of soluble sugars were found to increase. Under high-light level, drought-induced effects on lipid peroxidation, chlorophyll fluorescence parameters and gas exchange rates were fully reversed upon re-watering. However, the inhibition of diurnal accumulation of TNC still persisted two days following re-watering, suggesting that carbohydrate export rates were enhanced following stress relief. An overall positive effect was found upon transferring water-stressed plants to low light level, as indicated by the increases in Ψ, intrinsic water use efficiency (A/g), Φe and Fv’/Fm’, as well as the reversal of drought-induced enhancement of both NPQ and MDA concentration. Despite g being similar in shaded well-watered and re-watered plants, the latter exhibited net CO2 uptake rates below those found in well-watered leaves under the same light conditions, together with a diurnal decrease in the concentration of TNC that was mainly attributable to the depletion of starch and sucrose. These results indicate that contrasting with the positive effects of shading on water-stressed plants, low PPFD may negatively affect the recovery of net photosynthesis following stress relief.por
dc.identifier.citationCorreia, Maria João; Osório, Maria Leonor; Osório, Júlio; Barrote, Isabel; Martins, Mónica; David, Maria Manuela. Influence of transient shade periods on the effects of drought on photosynthesis, carbohydrate accumulation and lipid peroxidation in sunflower leaves. Environmental and Experimental Botany, 58, 1-3, 75-84, 2006.por
dc.identifier.doihttp://dx.doi.org/10.1016/j.envexpbot.2005.06.015
dc.identifier.issn00988472
dc.identifier.otherAUT: JCO00381; JOS01477; IBA00639; MDA00369;
dc.identifier.urihttp://hdl.handle.net/10400.1/1055
dc.language.isoengpor
dc.peerreviewedyespor
dc.subjectDroughtpor
dc.subjectHelianthus annuuspor
dc.subjectNon-structural sugarspor
dc.subjectShadepor
dc.subjectPhotosynthesispor
dc.subjectLipid peroxidationpor
dc.titleInfluence of transient shade periods on the effects of drought on photosynthesis, carbohydrate accumulation and lipid peroxidation in sunflower leavespor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage84por
oaire.citation.issue58por
oaire.citation.startPage75por
oaire.citation.titleEnvironmental and Experimental Botanypor
person.familyNameOsório
person.familyNameOsório
person.familyNameBarrote
person.familyNameDavid
person.givenNameMaria Leonor
person.givenNameJúlio
person.givenNameIsabel
person.givenNameMaria Manuela
person.identifier.ciencia-id801C-0AE4-B5CA
person.identifier.ciencia-idE31B-16E0-7562
person.identifier.orcid0000-0002-7713-6497
person.identifier.orcid0000-0002-4054-4091
person.identifier.orcid0000-0002-0922-0259
person.identifier.orcid0000-0001-6251-7222
person.identifier.ridN-8024-2013
person.identifier.scopus-author-id7006394339
person.identifier.scopus-author-id9938818600
person.identifier.scopus-author-id8659654200
person.identifier.scopus-author-id7402103697
rcaap.rightsopenAccesspor
rcaap.typearticlepor
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relation.isAuthorOfPublication.latestForDiscoveryb4ac527b-f4a2-4983-b98c-f5614f59dd49

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