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The effects of drought on net CO2 uptake, chlorophyll fluorescence and photosynthetic pigments in mature and young leaves of sunflower

2004Journal article Open access
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dc.contributor.authorOsório, Maria Leonor
dc.contributor.authorBarrote, Isabel
dc.contributor.authorOsório, Júlio
dc.contributor.authorDavid, Maria Manuela
dc.contributor.authorCorreia, Maria João
dc.date.accessioned2014-01-07T10:57:43Z
dc.date.available2014-01-07T10:57:43Z
dc.date.issued2004
dc.description.abstractPhotosynthesis, photosystem II activity and photosynthetic pigments were analysed in mature and Young leaves of sunflower (Helianthus annuus L.) during dehydration and rehydration, in order to determine the influence of leaf age on the sensitivity to drought. Dehydration caused a more pronounced inhibition in photosynthetic rates in mature leaves compared to younger leaves, but 24 h after rewatering the recovery was complete in spite of leaf age. After exposure to drought, mature leaves showed a larger reduction in the actual PSII photochemical efficiency and a higher increase in nonradiative energy dissipation than young leaves. In well-watered plants the de-epoxidation level represented by the ratio A+Z/V+A+Z was higher in young leaves. However drought had opposite effects on both type of leaves: in young leaves A+Z/V+A+Z decreased with water deficit, while in mature leaves increased with soil drying. The results obtained suggest that leaf age influence the “strategy” to avoid irreversible damage of PSII activity under drought and that older leaves are more drought-sensitive than younger leaves of sunflower.por
dc.identifier.citationOsório M.L., Barrote I., Osório J., David M.M., Correia M.J. (2004). The effects of drought on net CO2 uptake, chlorophyll fluorescence and photosynthetic pigments in mature and young leaves of sunflower. VII Simposium Luso-Espanhol de Relações Hídricas das plantas, Universidade do Algarve, Faro, Portugal, p127-130por
dc.identifier.otherAUT: IBA00639; JOS01477; MDA00369;JCO00381
dc.identifier.urihttp://hdl.handle.net/10400.1/3282
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherSociedade Portuguesa de Fisiologia Vegetalpor
dc.subjectDroughtpor
dc.subjectChlorophyll fluorescencepor
dc.subjectLeaf agepor
dc.subjectSunflowerpor
dc.subjectHelianthus annuuspor
dc.subjectPhotosynthetic pigmentspor
dc.subjectXanthophyll cyclepor
dc.subjectWater deficitpor
dc.subjectStress recoverypor
dc.subjectRewateringpor
dc.subjectPhotoinhibitionpor
dc.titleThe effects of drought on net CO2 uptake, chlorophyll fluorescence and photosynthetic pigments in mature and young leaves of sunflowerpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceUniversidade do Algarve, Faro, Portugalpor
oaire.citation.endPage130por
oaire.citation.startPage127por
oaire.citation.titleVII Simpósio Luso-Espanhol de Relações Hídricas das Plantaspor
person.familyNameOsório
person.familyNameBarrote
person.familyNameOsório
person.familyNameDavid
person.givenNameMaria Leonor
person.givenNameIsabel
person.givenNameJúlio
person.givenNameMaria Manuela
person.identifier.ciencia-id801C-0AE4-B5CA
person.identifier.ciencia-idE31B-16E0-7562
person.identifier.orcid0000-0002-7713-6497
person.identifier.orcid0000-0002-0922-0259
person.identifier.orcid0000-0002-4054-4091
person.identifier.orcid0000-0001-6251-7222
person.identifier.ridN-8024-2013
person.identifier.scopus-author-id7006394339
person.identifier.scopus-author-id8659654200
person.identifier.scopus-author-id9938818600
person.identifier.scopus-author-id7402103697
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication796eec66-f451-4ebf-938a-866b703df3ea
relation.isAuthorOfPublication8027b4d2-ee8d-4432-be75-7a2342a905a8
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relation.isAuthorOfPublicationb4ac527b-f4a2-4983-b98c-f5614f59dd49
relation.isAuthorOfPublication.latestForDiscoveryb4ac527b-f4a2-4983-b98c-f5614f59dd49

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