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Seasonal effects on the relationship between photosynthesis and leaf carbohydrates in orange trees

dc.contributor.authorRibeiro, Rafael V.
dc.contributor.authorMachado, Eduardo C.
dc.contributor.authorHabermann, Gustavo [UNESP]
dc.contributor.authorSantos, Mauro G.
dc.contributor.authorOliveira, Ricardo F.
dc.contributor.institutionIAC
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Pernambuco (UFPE)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2013-09-30T18:48:00Z
dc.date.accessioned2014-05-20T13:57:07Z
dc.date.available2013-09-30T18:48:00Z
dc.date.available2014-05-20T13:57:07Z
dc.date.issued2012-01-01
dc.description.abstractTo understand the effect of summer and winter on the relationships between leaf carbohydrate and photosynthesis in citrus trees growing in subtropical conditions, 'Valencia' orange trees were subjected to external manipulation of their carbohydrate concentration by exposing them to darkness and evaluating the maximal photosynthetic capacity. In addition, the relationships between carbohydrate and photosynthesis in the citrus leaves were studied under natural conditions. Exposing the leaves to dark conditions decreased the carbohydrate concentration and increased photosynthesis in both seasons, which is in accordance with the current model of carbohydrate regulation. Significant negative correlations were found between total non-structural carbohydrates and photosynthesis in both seasons. However, non-reducing sugars were the most important carbohydrate that apparently regulated photosynthesis on a typical summer day, whereas starch was important on a typical winter day. As a novelty, photosynthesis stimulation by carbohydrate consumption was approximately three times higher during the summer, i.e. the growing season. Under subtropical conditions, citrus leaves exhibited relatively high photosynthesis and high carbohydrate levels on the summer day, as well as a high nocturnal consumption of starch and soluble sugars. A positive association was determined between photosynthesis and photoassimilate consumption/exportation, even in leaves showing a high carbohydrate concentration. This paper provides evidence that photosynthesis in citrus leaves is regulated by an increase in sink demand rather than by the absolute carbohydrate concentration in leaves.en
dc.description.affiliationIAC, Ctr Pesquisa & Desenvolvimento Ecofisiol & Biofis, Lab Fisiol Vegetal Coaracy M Franco, Inst Agron, BR-13012970 Campinas, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Biociencias, Dept Bot, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUniversidade Federal de Pernambuco (UFPE), Dept Bot, BR-50670901 Recife, PE, Brazil
dc.description.affiliationUniv São Paulo, Escola Super Agr Luiz de Queiroz, Dept Ciencias Biol, BR-13418900 Piracicaba, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Inst Biociencias, Dept Bot, BR-13506900 Rio Claro, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 02/08480-7
dc.description.sponsorshipIdFAPESP: 05/57862-8
dc.description.sponsorshipIdCNPq: 303998/2008-3
dc.description.sponsorshipIdCNPq: 300713/2008-8
dc.format.extent471-480
dc.identifierhttp://dx.doi.org/10.1071/FP11277
dc.identifier.citationFunctional Plant Biology. Collingwood: Csiro Publishing, v. 39, n. 6, p. 471-480, 2012.
dc.identifier.doi10.1071/FP11277
dc.identifier.issn1445-4408
dc.identifier.lattes9831073276253765
dc.identifier.urihttp://hdl.handle.net/11449/20376
dc.identifier.wosWOS:000304667900003
dc.language.isoeng
dc.publisherCSIRO Publishing
dc.relation.ispartofFunctional Plant Biology
dc.relation.ispartofjcr2.083
dc.relation.ispartofsjr1,067
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectCitrus sinensisen
dc.subjectgas exchangeen
dc.subjectgrowthen
dc.subjectseasonalityen
dc.subjectsource-sinken
dc.titleSeasonal effects on the relationship between photosynthesis and leaf carbohydrates in orange treesen
dc.typeArtigo
dcterms.licensehttp://www.publish.csiro.au/media/client/CopyrightAssign.pdf
dcterms.rightsHolderCsiro Publishing
dspace.entity.typePublication
unesp.author.lattes9831073276253765
unesp.author.orcid0000-0001-5146-4591[4]
unesp.author.orcid0000-0002-5209-2846[5]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Rio Claropt
unesp.departmentBotânica - IBpt

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