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dc.contributor.authorDaMATTA, F. M.pt_BR
dc.contributor.authorGODOY, A. G.pt_BR
dc.contributor.authorMENEZES-SILVA, P. E.pt_BR
dc.contributor.authorMARTINS, S. C. V.pt_BR
dc.contributor.authorSANGLARD, L. M. V. P.pt_BR
dc.contributor.authorMORAIS, L. E.pt_BR
dc.contributor.authorTORRE-NETO, A.pt_BR
dc.contributor.authorGHINI, R.pt_BR
dc.date.accessioned2016-01-25T11:11:11Zpt_BR
dc.date.available2016-01-25T11:11:11Zpt_BR
dc.date.created2016-01-25pt_BR
dc.date.issued2016pt_BR
dc.identifier.citationJournal of Experimental Botany, London, v. 67, n. 1, p. 341-352, 2016.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1034947pt_BR
dc.descriptionAbstract: Coffee (Coffea spp.), a globally traded commodity, is a slow-growing tropical tree species that displays an improved photosynthetic performance when grown under elevated atmospheric CO2 concentrations ([CO2]). To investigate the mechanisms underlying this response, two commercial coffee cultivars (Catuaí and Obatã) were grown using the first free-air CO2 enrichment (FACE) facility in Latin America. Measurements were conducted in two contrasting growth seasons, which were characterized by the high (February) and low (August) sink demand. Elevated [CO2] led to increases in net photosynthetic rates (A) in parallel with decreased photorespiration rates, with no photochemical limitations to A. The stimulation of A by elevated CO2 supply was more prominent in August (56% on average) than in February (40% on average). Overall, the stomatal and mesophyll conductances, as well as the leaf nitrogen and phosphorus concentrations, were unresponsive to the treatments. Photosynthesis was strongly limited by diffusional constraints, particularly at the stomata level, and this pattern was little, if at all, affected by elevated [CO2]. Relative to February, starch pools (but not soluble sugars) increased remarkably (>500%) in August, with no detectable alteration in the maximum carboxylation capacity estimated on a chloroplast [CO2] basis. Upregulation of A by elevated [CO2] took place with no signs of photosynthetic downregulation, even during the period of low sink demand, when acclimation would be expected to be greatest.pt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectCoffea arabica Lpt_BR
dc.subjectPhotosynthetic limitationspt_BR
dc.subjectPhotosynthetic acclimationpt_BR
dc.subjectStartchpt_BR
dc.titleSustained enhancement of photosynthesis in coffee trees grown under free-air CO2 enrichment conditions: disentangling the contributions of stomatal, mesophyll, and biochemical limitations.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2017-02-18T11:11:11Zpt_BR
dc.subject.thesagroCafépt_BR
dc.subject.thesagroFotossíntesept_BR
dc.subject.thesagroClimapt_BR
dc.subject.thesagroDióxido de carbonopt_BR
dc.subject.thesagroMudança Climáticapt_BR
dc.subject.nalthesaurusPhotosynthesispt_BR
dc.subject.nalthesaurusClimate changept_BR
dc.subject.nalthesaurusCarbon dioxidept_BR
dc.subject.nalthesauruscarbohydratespt_BR
dc.subject.nalthesaurusfacept_BR
dc.subject.nalthesaurusnitrogenpt_BR
dc.subject.nalthesaurusstarchpt_BR
riaa.ainfo.id1034947pt_BR
riaa.ainfo.lastupdate2017-02-18pt_BR
dc.contributor.institutionFABIO MURILO DAMATTA, UFV; ALICE GONTIJO DE GODOY, UFV; PAULO EDUARDO DE MENEZES SILVA, UFV; SAMUEL CORDEIRO VITOR MARTINS, UFV; LILIAN MARIA VINCIS PEREIRA SANGLARD, UFV; LEANDRO ELIAS MORAIS, UFV; ANDRE TORRE NETO, CNPDIA; RAQUEL GHINI, CNPMA.pt_BR
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