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Photosynthetic responses of Lupinus albus to soil water fluctuations

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dc.contributor.authorBarrote, Isabel
dc.contributor.authorOsório, Maria Leonor
dc.contributor.authorOsório, Júlio
dc.contributor.authorDavid, Maria Manuela
dc.contributor.authorCorreia, Maria João
dc.date.accessioned2012-04-19T14:58:47Z
dc.date.available2012-04-19T14:58:47Z
dc.date.issued2002
dc.date.updated2012-04-12T15:30:48Z
dc.description.abstractLupinus albus plants were grown in 3 dm3 pots in a semi-controled greenhouse. Two water regimes were imposed: water deficit (S, 47% of soil capacity), and control (T, 86% of soil capacity). Plants water status was monitored through foliar relative water content (TRA) and pre-dawn (ypd) and midday water potential (ymd). Gas exchanges, chlorophyll a fluorescence and photosynthetic capacity (Amax) were measured. Pigments and soluble protein were quantified and antioxidant system enzymes activity was determined. Plants under water deficit were rehydrated and the same measurements and sampling were done again after 48 h (R1) and 72 h (R2). Albeit water availability has diminished from 86% to 47% of soil capacity, there weren’t any remarkable changes on S plants. R1 plants which haven’t shown any alterations neither in Amax nor in stomatal conductance (gH2O), exhibited a significant decrease on net photosynthesis (A), reaching negative values, along with a raise in non-photochemical quenching (NPQ). Presumably this raise should be related with an increase in the xanthophyll cycle deepoxidation state. The significantly increase in Superoxide dismutase (SOD) specific activity in R1 and R2 plants might be related with the activation of Mehler-peroxidase reaction which provokes lumen DpH raising. This can provide photosynthesis protection through VAZ cycle and may justify the NPQ increase.por
dc.identifier.citationBarrote, Isabel; Osório, Maria Leonor; Osório, Júlio; David, Maria Manuela; Correia, Maria João. Photosynthetic responses of Lupinus albus to soil water fluctuations. Trabalho apresentado em VI Simposium Hispano-Portugués de Relaciones Hidricas en las Plantas. In Actas del VI Simposium Hispano-Portugués de Relaciones Hidricas en las Plantas, Pamplona, 2002.por
dc.identifier.issn84-95844-01-X
dc.identifier.otherAUT: IBA00639; JCO00381; JOS01477; MDA00369;
dc.identifier.urihttp://hdl.handle.net/10400.1/1066
dc.language.isoporpor
dc.peerreviewedyespor
dc.subjectDroughtpor
dc.subjectPhotosynthesispor
dc.subjectLupinus albuspor
dc.titlePhotosynthetic responses of Lupinus albus to soil water fluctuationspor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlacePamplonapor
oaire.citation.titleVI Simposium Hispano-Portugués de Relaciones Hidricas en las Plantaspor
person.familyNameBarrote
person.familyNameOsório
person.familyNameOsório
person.familyNameDavid
person.givenNameIsabel
person.givenNameMaria Leonor
person.givenNameJúlio
person.givenNameMaria Manuela
person.identifier.ciencia-id801C-0AE4-B5CA
person.identifier.ciencia-idE31B-16E0-7562
person.identifier.orcid0000-0002-0922-0259
person.identifier.orcid0000-0002-7713-6497
person.identifier.orcid0000-0002-4054-4091
person.identifier.orcid0000-0001-6251-7222
person.identifier.ridN-8024-2013
person.identifier.scopus-author-id8659654200
person.identifier.scopus-author-id7006394339
person.identifier.scopus-author-id9938818600
person.identifier.scopus-author-id7402103697
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
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relation.isAuthorOfPublication796eec66-f451-4ebf-938a-866b703df3ea
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relation.isAuthorOfPublicationb4ac527b-f4a2-4983-b98c-f5614f59dd49
relation.isAuthorOfPublication.latestForDiscovery8027b4d2-ee8d-4432-be75-7a2342a905a8

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