Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1116357
Registro completo de metadados
Campo DCValorIdioma
dc.contributor.authorRAKOCEVIC, M.pt_BR
dc.contributor.authorBATISTA, E. R.pt_BR
dc.date.accessioned2019-12-09T18:18:48Z-
dc.date.available2019-12-09T18:18:48Z-
dc.date.created2019-12-09
dc.date.issued2019
dc.identifier.citationIn: AGRICULTURE AND CLIMATE CHANGE CONFERENCE, 3., 2019, Budapest. [Abstracts...] Budapest: Elsevier Ltd., 2019. Ref. P073.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1116357-
dc.descriptionTrends in climate changes indicate that the air [CO2] will continue to increase. The first plant response to elevated [CO2] (e[CO2]) is the increased photosynthetic rate. Photosynthetic rate dependence on light (A/PAR curves) is characterized by several parameters, often used to determine plant species responses to environment and phenological plasticity. The effects of water supply and phenological stage were expected, with no acclimation after long-term Coffea arabica L. cultivation under e[CO2]. The aim of the study was to determine variations in parameters of A/PAR curves in coffee leaves over a tree vertical profile after long-term cultivation under free-air-CO2-enrichment (FACE) system. The p arameters of A/PAR curves in C. arabica were estimated after five-years cultivation in FACE under two CO2 conditions, actual (a[CO2], ~390?L CO2 L-1) and e[CO2] (~590?L CO2 L-1), in two water regimes (rainfed and irrigation). The A/PAR curves were estimated in two phenological stages (grain formation - February 2016 and fruit maturation - May 2016). The A/PAR responses were determined by varying photosynthetic active radiation (PAR) from 1117 to 0 ?mol photons m?2 s?1 in four 50 cm-thick layers of vertical plant profile. The maximum photosynthesis (Amax), dark respiration (Rd), apparent quantum efficiency (?), and light compensation point (?) generally increased under e[CO2] compared to a[CO2], showing higher values during grain formation than during fruit maturation (Figure 1). The Rd and ? followed the progressive increase by layers only during the grain formation (Figures 1C and 1E). Continuation in e[CO2] stimulation indicated that leaf photosynthesis acclimation did not occur after five-years coffee cultivation under FACE. The lack of progressive increase in Amax, ? and ? over vertical profile indicates leaf plasticity to light availability, especially considering the high Amax of the two lowest layers. The compensation effects of e[CO2] to low water availability were observed in all A/PAR responses.pt_BR
dc.language.isoporpt_BR
dc.rightsopenAccesspt_BR
dc.subjectFACE experimentpt_BR
dc.subjectElevated CO2pt_BR
dc.subjectAmaxpt_BR
dc.titlePhotosynthetic light curve parameters over vertical profile of Coffea arabica plants after five years of FACE experiment.pt_BR
dc.typeResumo em anais e proceedingspt_BR
dc.date.updated2019-12-10T11:11:11Z
dc.subject.thesagroMudança Climáticapt_BR
dc.subject.thesagroCoffea Arábicapt_BR
dc.subject.thesagroSecapt_BR
dc.subject.nalthesaurusDroughtpt_BR
dc.subject.nalthesaurusPhenologypt_BR
riaa.ainfo.id1116357pt_BR
riaa.ainfo.lastupdate2019-12-10 -02:00:00
dc.contributor.institutionMiroslava RAKOCEVIC, Unicamp; EUNICE REIS BATISTA, CNPMA.pt_BR
Aparece nas coleções:Resumo em anais de congresso (CNPMA)

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
RABatistaER3rdAgricultureClimate...2019RefP073.pdf238,26 kBAdobe PDFThumbnail
Visualizar/Abrir
Mostrar registro simples do item Visualizar estatísticas

FacebookTwitterDeliciousLinkedInGoogle BookmarksMySpace