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dc.contributor.authorMahouachi, Jalel
dc.contributor.authorArgamasilla, Rosa
dc.contributor.authorGómez Cadenas, Aurelio
dc.date.accessioned2013-06-13T13:59:26Z
dc.date.available2013-06-13T13:59:26Z
dc.date.issued2012
dc.identifier.issn0721-7595
dc.identifier.issn1435-8107
dc.identifier.urihttp://hdl.handle.net/10234/67098
dc.description.abstractThe effects of exogenous foliar glycine betaine (GB) and abscisic acid (ABA) on papaya responses to water stress were investigated under distinct water regimes. Papaya seedlings (Carica papaya L. cultivar “BH-65”) were pretreated with GB or ABA and subsequently subjected to consecutive periods of drought, rehydration, and a second period of drought conditions. Results indicated that water stress induced ABA, jasmonic acid (JA), and proline accumulation but did not modify malondialdehyde (MDA) concentration. In addition, water deprivation reduced photosynthetic rate, stomatal conductance, relative water content (RWC), leaf fresh weight, and increased leaf abscission. GB applied prior to drought imposition decreased the impact of water stress on ABA, JA, proline accumulation, leaf water status, growth, and photosynthetic performance. However, ABA-pretreated plants did not show alteration of most of these parameters under water stress conditions when compared with non-pretreated plants except a clear induction of JA accumulation. Taken together, the data suggest that GB may modulate ABA, JA, and proline accumulation through the control of stomatal movement and the high availability of compatible solutes, leading to improvement of leaf water status, growth, and photosynthetic machinery function. In contrast, exogenous ABA did not stimulate papaya physiological responses under drought, but interestingly ABA in combination with drought could induce progressive JA synthesis, unlike drought alone, which induces a transitory JA increase and may trigger endogenous ABA accumulation. The data also suggest that irrespective of the pretreatments, papaya did not suffer oxidative damage.ca_CA
dc.language.isoengca_CA
dc.publisherSpringer-Verlagca_CA
dc.relation.isPartOfJournal of Plant Growth Regulation, 31, 1ca_CA
dc.rights(c) Springer Science+Business Media, LLC 2011ca_CA
dc.subjectAbscissionca_CA
dc.subjectDroughtca_CA
dc.subjectJasmonic acidca_CA
dc.subjectLeaf growthca_CA
dc.subjectMalondialdehydeca_CA
dc.subjectPhotosynthesisca_CA
dc.subjectProlineca_CA
dc.subjectRehydrationca_CA
dc.titleInfluence of Exogenous Glycine Betaine and Abscisic Acid on Papaya in Responses to Water-deficit Stressca_CA
dc.typeinfo:eu-repo/semantics/articleca_CA
dc.identifier.doihttp://dx.doi.org/10.1007/s00344-011-9214-z
dc.rights.accessRightsinfo:eu-repo/semantics/restrictedAccessca_CA
dc.relation.publisherVersionhttp://link.springer.com/article/10.1007/s00344-011-9214-zca_CA


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