Gas exchange rates at different vapor pressure deficits and water relations of 'Pera' sweet orange plants with citrus variegated chlorosis (CVC)

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dc.contributor.authorHabermann, G.
dc.contributor.authorMachado, E. C.
dc.contributor.authorRodrigues, J. D.
dc.contributor.authorMedina, C. L.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionCtr Ecofisiol & Biofis
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.date.accessioned2014-05-20T13:48:19Z
dc.date.available2014-05-20T13:48:19Z
dc.date.issued2003-05-20
dc.description.abstractNet photosynthesis (A) and transpiration rates (E), stomatal conductance (g), water use efficiency (WUE), intrinsic water use efficiency (IWUE) and internal leaf CO2 concentration (C) in response to different vapor pressure deficit (1.2 and 2.5 kPa) were investigated in 'Pera' sweet orange plants affected by citrus variegated chlorosis (CVC), a disease caused by Xylella fastidiosa. All plants were well watered and leaf water potential (Pw) was also measured by the psychrometric technique. Results showed that healthy plants responded to higher vapor pressure deficit (VPD), lowering its net photosynthesis and transpiration rates, and stomatal conductance. However, diseased plants presented no clear response to VPD, showing lower A, E and g for both VPDs studied and very similar values to these variables in healthy plants at the highest VPD. Internal leaf CO2 concentration also decreased for healthy plants when under the highest VPD, and surprisingly, the same pattern of response was found in plants with CVC. These results, the lower Psi(w) and higher WUE values for diseased plants, indicated that this disease may cause stomatal dysfunction and affect the water resistance through xylem vessels, which ultimately may play some role in photosynthetic metabolism. (C) 2003 Elsevier B.V. B.V. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, Dept Bot, Inst Biociencias, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationCtr Ecofisiol & Biofis, IAC, BR-13001970 Campinas, SP, Brazil
dc.description.affiliationUniv Estadual Campinas, Dept Fisiol Vegetal, BR-13083970 Campinas, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Bot, Inst Biociencias, BR-18618000 Botucatu, SP, Brazil
dc.format.extent233-245
dc.identifierhttp://dx.doi.org/10.1016/S0304-4238(02)00228-5
dc.identifier.citationScientia Horticulturae. Amsterdam: Elsevier B.V., v. 98, n. 3, p. 233-245, 2003.
dc.identifier.doi10.1016/S0304-4238(02)00228-5
dc.identifier.issn0304-4238
dc.identifier.lattes4211432128816409
dc.identifier.urihttp://hdl.handle.net/11449/17225
dc.identifier.wosWOS:000182778100004
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofScientia Horticulturae
dc.relation.ispartofjcr1.760
dc.relation.ispartofsjr0,799
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectXylella fastidiosapt
dc.subjectCitrus sinensis L. Osbeckpt
dc.subjectphotosynthesispt
dc.subjectstomatapt
dc.titleGas exchange rates at different vapor pressure deficits and water relations of 'Pera' sweet orange plants with citrus variegated chlorosis (CVC)en
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes4211432128816409
unesp.author.orcid0000-0001-7965-4696[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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