Hemicellulosic Polysaccharides from the Xylopodium of Ocimum nudicaule: Changes in Composition in Dormancy and Sprouting |
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Authors: | FIGUEIREDO-RIBEIRO, RITA DE CASSIA L. ISEJIMA, ELIZA MITIKO DIETRICH, SONIA M. CAMPOS CORREA, JOAO B. CHAVES |
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Affiliation: | * Seção de Fisiologia e Bioquimica de Plantas, Institute de Botânica Caixa Postal 4005, 01051 São Paulo, SP Departamento de Engenharia Quimica, Universidade Federal do Paraná Curitiba, Brasil |
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Abstract: | Changes in the yield and composition of hemicelluloses fromthe underground organs (xylopodia) of Ocimum nudicaule wereinvestigated. Hemicelluloses constituted about 12% of the delipidizedpowder in sprouting and about 30 % in dormant phases. Xyloseis the major component of hemicelluloses A and B (and is alsopresent in C), followed by arabinose, galactose, glucose, rhamnoseand mannose. The amounts of hemicellulose B decreased by sixtimes between dormancy and sprouting, whereas the yields ofhemicelluloses A and C remained constant. This, together withthe higher solubility of hemicellulose B and its higher susceptibilityto hemicellulase in sprouting indicates that this fraction constitutesa cell-wall bound storage polysaccharide, which may play a rolein the onset of xylopodia bud sprouting. Ocimum nudicaule, hemicelluloses, cell-wall storage polysaccharide |
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