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Growth, photosynthate partitioning and fructan accumulation in plants of Vernonia herbacea (Vell.) Rusby under two nitrogen levels Braz. J. Plant Physiol.
Cuzzuol,Geraldo Rogério Faustini; Carvalho,Maria Angela Machado de; Zaidan,Lilian B.P..
The effect of two nitrogen concentrations on fructan accumulation and plant growth was analysed in plants of Vernonia herbacea during a year period. Plants of this species accumulate inulin-type fructans in the underground reserve organs (rhizophores). The plants were cultivated in glasshouse conditions and received weekly nutrient solutions containing 1.3 mmol.L-1 NO3- (N-limited) or 10.7 mmol.L-1 NO3- (N-sufficient). Plants treated with N-sufficient solution presented an increase in total growth with higher biomass, more but smaller leaves resulting in higher total leaf area, higher net assimilation rate, specific leaf mass and higher biomass allocation to aerial organs. In addition, these plants presented higher contents of reducing sugars and lower...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Asteraceae; Cerrado; Fructans; Underground reserve organs.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000400008
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Changes in pectins of the Xylopodium of Ocimum nudicaule from dormancy to sprouting Braz. J. Plant Physiol.
Braga,Márcia Regina; Carpita,Nicholas C.; Dietrich,Sonia M. C.; Figueiredo-Ribeiro,Rita de Cássia L..
The thickened underground organ of Ocimum nudicaule is a tuber-like structure (xylopodium) that is dormant in winter and sprouts at the beginning of the spring. Changes in content of cell wall polysaccharides were shown to occur from dormancy to sprouting. Pectic polysaccharides of O. nudicaule were analyzed in relation to composition, molecular mass, and linkage structure in these two phenological phases. The pectin content was 33 % lower during sprouting when compared to dormancy. Changes were also observed in the molecular mass of the pectin fraction from dormancy to sprouting. Galacturonic acid was the predominant sugar, suggesting the presence of a homogalacturonan as the main pectic polysaccharide. A decrease in the acidic polysaccharides,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cell-wall polysaccharides; Cerrado; Lamiaceae; Underground reserve organs; Xylopodium.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000200009
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