Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/936993
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dc.contributor.authorDALLAGNOLA, L. J.pt_BR
dc.contributor.authorRODRIGUES, F. A.pt_BR
dc.contributor.authorCHAVES, A. R. de M.pt_BR
dc.contributor.authorVALE, F. X. R.pt_BR
dc.contributor.authorMATTA, F. M. dapt_BR
dc.date.accessioned2012-10-17T11:11:11Zpt_BR
dc.date.available2012-10-17T11:11:11Zpt_BR
dc.date.created2012-10-17pt_BR
dc.date.issued2012pt_BR
dc.identifier.citationPlant Pathology, v. 61, p. 1-10, 2012.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/936993pt_BR
dc.descriptionThe effect of soluble silicon (Si) on photosynthetic parameters and soluble sugar concentrations was determined in leaves of rice cv. Oochikara and mutant plants of Oochikara defective in active Si uptake [low silicon 1 (lsi1)]. Plants were grown in hydroponic culture amended with 0 ()Si) or 2 mM Si (+Si), under either low or high photon flux density (PFD) and with or without inoculation with Bipolaris oryzae, the causal agent of brown spot of rice. Leaf Si concentration increased by 141 and 435% in +Si cv. Oochikara and by 119 and 251% in +Si lsi1 mutant plants under high and low PFD, respectively, com- pared with )Si plants. Plant biomass accumulation was improved by Si regardless of PFD, especially plants for cv. Oochikara. Brown spot severity was highest in )Si plants for cv. Oochikara and lsi1 mutant plants under low PFD. In the presence of Si, disease severity in plants grown under both low and high PFD was reduced, except for lsi1 mutant plants under high PFD. Plant inoculation reduced the photosynthetic parameters measured regardless of plant material or Si supply. A decrease of net carbon assimilation rate (A) of inoculated plants under low PFD compared with non-inoculated plants was associated with damage in the photosynthetic apparatus, except for +Si cv. Oochikara in which stomatal restriction [low water vapour conductance (gs)] contributed to A reduction. Under high PFD, damage to the photosynthetic apparatus of inoculated plants was the main reason for the reduction in A for +Si and )Si lsi1 mutant plants. In addition, for )Si cv. Oochikara, a reduction in gs contributed to reduced A. However, for +Si cv. Oochikara, gs was the limiting factor for A. Inoculated plants of +Si cv. Oochikara had higher A values than +Si lsi1 mutant plants, regardless of environmental conditions. Soluble sugars were not detected in leaf tissues of plants under low PFD. For high PFD, Si improved the hexose concentration in non-inoculated plants at 144 h after inoculation (hai) for lsi1 mutant plants and from 96 hai onwards for cv. Oochikara compared with Si plants. However, plant inoculation reduced hexose concentration compared with non-inoculated plants, mainly in +Si plants, regardless of plant material. Sucrose concentration increased in leaves of cv. Oochikara in the presence of Si whether inoculated or not. For +Si lsi1 mutant plants, sucrose concentration increased only at 48 hai compared with )Si plants, whether inoculated or not. The results of this study show that a minimum Si concentration is needed in leaf tissues of rice plants to avoid the negative impact of B. oryzae infection on photosynthesis and sugar concentration. High leaf Si con- centration resulted in an increased soluble sugar concentration and together, but in independent ways, soluble sugar and Si reduced brown spot severity of rice.eng
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectDoença foliarpt_BR
dc.subjectTrocas gasosaspt_BR
dc.subjectDensidade de fluxo de fótonspt_BR
dc.subjectAçúcares solúveispt_BR
dc.subjectSilício solúveleng
dc.titlePhotosynthesis and sugar concentration are impaired by the defective active silicon uptake in rice plants infected with Bipolaris oryzae.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2012-10-17T11:11:11Zpt_BR
dc.subject.thesagroArrozpt_BR
dc.subject.thesagroCerealpt_BR
dc.subject.thesagroDoençapt_BR
dc.subject.thesagroMancha Marrompt_BR
dc.subject.thesagroOryza Sativapt_BR
dc.subject.nalthesaurusRicept_BR
dc.subject.nalthesaurusBipolaris oryzaept_BR
dc.subject.nalthesaurusGas exchangeeng
dc.subject.nalthesaurusFungal brown spoteng
dc.subject.nalthesaurusFoliar diseaseseng
riaa.ainfo.id936993pt_BR
riaa.ainfo.lastupdate2012-10-17pt_BR
dc.contributor.institutionAGNALDO RODRIGUES DE MELO CHAVES, CPATSA.pt_BR
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