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Leaf gas exchange and fruit yield in sweet orange trees as affected by citrus variegated chlorosis and environmental conditions

dc.contributor.authorHabermann, Gustavo [UNESP]
dc.contributor.authorRodrigues, Joao Domingos [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2013-09-30T18:47:55Z
dc.date.accessioned2014-05-20T13:57:05Z
dc.date.available2013-09-30T18:47:55Z
dc.date.available2014-05-20T13:57:05Z
dc.date.issued2009-09-01
dc.description.abstractCitrus variegated chlorosis (CVC) is a disease caused by the bacterium Xylella fastidiosa. The most productive areas for citrus in Brazil are the northwestern and the northern regions of the São Paulo state, where CVC incidence is more severe. Additionally, these areas have the highest temperatures as well as significant vapor pressure deficits (VPD) and seasonal droughts. Environmental stresses are known to affect CVC-infected plants under semi-controlled conditions, but it is unclear whether similar effects occur in the field. The objective of this work was to evaluate the CVC leaf symptoms and environmental influences on fruit yield and size, and physiological parameters of healthy and CVC-affected plants (including both non-symptomatic and symptomatic leaves) in the morning and afternoon during the wet and dry seasons of 2003 in the southern, central and northern regions of the São Paulo state, Brazil. Increased VPD caused the stomatal conductance (gs) and CO(2) assimilation rates (A) to drop in healthy plants, but diseased plants had low VPD influences on gs, especially closer to the northern region and in leaves that were more symptomatic, confirming that diseased plants do not respond to changes in environmental VPD, corroborating several results reported in the literature. Although symptomatic northern leaves exhibited low stomatal apertures, the northern region had the highest air temperatures and VPDs, increasing the water loss in these plants, suggesting that towards the northern region plants face greater atmospheric and soil water stress. The fruit size of diseased plants diminished towards the north, while the fruit size of healthy plants must have been influenced by the tree fruit load. We suggest that CVC-affected plants suffer greater physiological damage if grown under environmental constraint, such as that found in the northern region of the São Paulo state. (C) 2009 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, Dept Bot, IB, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Bot, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Bot, IB, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Bot, BR-18618000 Botucatu, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 00/01167-6
dc.description.sponsorshipIdFAPESP: 01/02442-3
dc.format.extent69-76
dc.identifierhttp://dx.doi.org/10.1016/j.scienta.2009.04.003
dc.identifier.citationScientia Horticulturae. Amsterdam: Elsevier B.V., v. 122, n. 1, p. 69-76, 2009.
dc.identifier.doi10.1016/j.scienta.2009.04.003
dc.identifier.issn0304-4238
dc.identifier.lattes9831073276253765
dc.identifier.urihttp://hdl.handle.net/11449/20358
dc.identifier.wosWOS:000268045900011
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.subjectCitrus sinensisen
dc.subjectPhotosynthesisen
dc.subjectSeasonal effectsen
dc.subjectXylella fastidiosaen
dc.titleLeaf gas exchange and fruit yield in sweet orange trees as affected by citrus variegated chlorosis and environmental conditionsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
dspace.entity.typePublication
unesp.author.lattes9831073276253765
unesp.author.orcid0000-0001-7965-4696[2]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Botucatupt
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Rio Claropt
unesp.departmentBotânica - IBBpt
unesp.departmentBotânica - IBpt

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