Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/103963
Unidade da Embrapa/Coleção:: Área de Informação da Sede - Artigo em periódico indexado (ALICE)
Data do documento: 20-Set-2001
Tipo do Material: Artigo em periódico indexado (ALICE)
Autoria: VITORINO, P.G.
ALVES, J.D.
MAGALHAES, P.C.
MAGALHAES, M.M.
LIMA, L.C.O.
OLIVEIRA, L.E.M. de
Informaçães Adicionais: CNPMS
Título: Flooding tolerance and cell wall alterations in maize mesocotyl during hypoxia.
Edição: 2001
Fonte/Imprenta: Pesquisa Agropecuaria Brasileira, Brasilia, v.36, n.8, p.1027-35, ago. 2001.
Idioma: en
Palavras-chave: Pectic substances
Substancias pecticas.
Conteúdo: This research aimed to characterize the tolerance to flooding and alterations in pectic and hemicellulose fractions from mesocotyl of maize tolerant to flooding when submitted to hypoxia. In order to characterize tolerance seeds from maize cultivars Saracura BRS-4154 and BR 107 tolerant and sensitive to low oxygen levels, respectively, were set to germinate. Plantlet survival was evaluated during five days after having been submitted to hypoxia. After fractionation with ammonium oxalate 0.5% (w/v) and KOH 2M and 4M, Saracura BRS-4154 cell wall was obtained from mesocotyl segments with different damage intensities caused by oxygen deficiency exposure. The cell wall fractions were analyzed by gel filtration and gas chromatography, and also by Infrared Spectrum with Fourrier Transformation (FTIR). The hypoxia period lasting three days or longer caused cell lysis and in advanced stages plant death. The gelic profile from pectic, hemicellulose 2M and 4M fractions from samples with translucid and constriction zone showed the appearance of low molecular weight compounds, similar to glucose. The main neutral sugars in pectic and hemicellulose fractions were arabinose, xilose and mannose. The FTIR spectrum showed a gradual decrease in pectic substances from mesocotyl with normal to translucid and constriction appearance respectively.
Thesagro: Hemicelulose.
NAL Thesaurus: hemicellulose.
Ano de Publicação: 2001
Aparece nas coleções:Artigo em periódico indexado (AI-SEDE) / Embrapa Informação Tecnológica (SCT)

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