Hemicellulosic Polysaccharides from the Xylopodium of Ocimum nudicaule: Changes in Composition in Dormancy and Sprouting

Figueiredo-Ribeiro, Rita de Cássia L.; Isejima, Eliza Mitiko; Dietrich, Sônia M. C.; Corrěa, João B.C.

doi:10.1093/oxfordjournals.aob.a088495

Cited by 5 publications

(8 citation statements)

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“…33 % (8.6 to 5.7 % of the cell wall dry mass) during sprouting when compared to the dormancy phase, as previously reported by Figueiredo-Ribeiro et al (1992). After ethanol precipitation, only small amounts of total carbohydrate could be re-solubilized from the pectin fraction, accounting for 15.7 % and 11.6 of the dry mass of these fractions for dormancy and sprouting, respectively.…”

Section: Resultssupporting

confidence: 84%

“…Cell walls were prepared as alcohol-insoluble residue (AIR) as described by Figueiredo-Ribeiro et al (1992). The AIR was ground in a 40-mesh mill and lipids and pigments were removed using benzene:ethanol (2:1, v/v) for 72 h under reflux.…”

Section: Xylopodiamentioning

confidence: 99%

“…The thickened underground organ of this species is a tuber-like structure (xylopodium), which is dormant in winter and sprouts at the beginning of the spring (figure 1). Since it arises from the hypocotyl and the base of the primary root, the xylopodium has mixed features of stem and root (Figueiredo, 1972;Milanez and Moraes-Dallaqua, 2003). It also has been described as a water storage organ of herbaceous species from the cerrado (Rizzini and Heringer, 1961).…”

Section: Introductionmentioning

confidence: 99%

“…Starch is not detected in the xylopodium of O. nudicaule, and soluble sugars and cell-wall storage carbohydrates constitute the main source of energy for bud growth (Figueiredo-Ribeiro and Dietrich, 1981;Figueiredo-Ribeiro et al, 1992). Changes in both content and composition of non-cellulosic polysaccharides, such as arabinoxylans, were shown to occur from dormancy to sprouting.…”

Section: Introductionmentioning

confidence: 99%

“…Changes in both content and composition of non-cellulosic polysaccharides, such as arabinoxylans, were shown to occur from dormancy to sprouting. Pectins also decrease during sprouting (Figueiredo-Ribeiro et al, 1992), but changes in their composition during dormant and sprouting phases were not investigated.…”

Section: Introductionmentioning

confidence: 99%

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Changes in pectins of the Xylopodium of Ocimum nudicaule from dormancy to sprouting

Braga

Carpita

Dietrich

et al. 2006

Braz. J. Plant Physiol.

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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, homogalacturonans and rhamnogalacturonan I, equally accounted for the decrease in the pectin composition upon sprouting. These acidic carbohydrates were predominantly detected in the cell walls of the phellogen region of the xylopodium, suggesting catabolism of the cell walls of this tissue during bud flushing. These results suggest that variations in the content and in the molecular mass of pectins, in addition to changes in their composition and structure could be related to storage function as well as cell wall extension growth, both required for the sprouting of new buds in the xylopodium of O. nudicaule. Key words: cell-wall polysaccharides, cerrado, Lamiaceae, underground reserve organs, xylopodium.Variações nas pectinas de Ocimum nudicaule da dormência para a brotação. O órgão subterrâneo espessado de Ocimum nudicaule é um xilopódio, que permanece dormente durante o inverno e apresenta brotação no início da primavera. Alterações no conteúdo de polissacarídeos da parede celular ocorrem da dormência para a brotação nessa espécie. Neste trabalho, polissacarídeos pécticos de O. nudicaule foram analisados quanto à composição, tamanho molecular e estrutura nessas duas fases fenológicas. O conteúdo de pectinas foi 33 % menor durante a brotação quando comparado à fase de dormência. Variações também foram observadas no tamanho molecular da fração péctica da dormência para a brotação. Ácido galacturônico foi o açú-car predominante, sugerindo a presença de um homogalaturonano como principal polissacarídeo péctico. Decréscimo dos polissacarídeos ácidos, homogalacturonanos e ramnogalacturonano I, também contribuíram para a diminuição observada com a brotação. Esses polissacarídeos ácidos foram detectados predominantemente no felogênio, sugerindo catabolismo das paredes celulares desse tecido durante a brotação. Os resultados obtidos sugerem que variações no conteúdo e tamanho molecular das pectinas, em adição a mudanças na sua composição e estrutura, podem estar relacionadas à função de reserva, assim como à expansão celular, ambos processos necessários para a brotação do xilopódio de O. nudicaule. Palavras-chave: polissacarídeos de parede celular, cerrado, Lamiaceae, órgãos subterrâneos de reserva, xilopódio.

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Section: Resultssupporting

confidence: 84%

Section: Xylopodiamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Changes in pectins of the Xylopodium of Ocimum nudicaule from dormancy to sprouting

Braga

Carpita

Dietrich

et al. 2006

Braz. J. Plant Physiol.

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Comparative Morphology, Anatomy, and Function of the Stem and Root of the Flowering Plants

Dickison

1994

Progress in Botany

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Seasonal patterns of reserve and soluble carbohydrates in mature sugar maple (Acer saccharum)

Wong¹,

Baggett²,

Rye³

2003

Can. J. Bot.

103

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Sugar maple (Acer saccharum Marsh.) trees exhibit seasonal patterns of production, accumulation, and utilization of nonstructural carbohydrates that are closely correlated with phenological events and (or) physiological processes. The simultaneous seasonal patterns of both reserve and soluble carbohydrates in the leaves, twigs, branches, and trunks of healthy mature sugar maple trees were characterized. The concentrations of starch and soluble sugars (sucrose, glucose, fructose, xylose, raffinose, and stachyose) were determined. Starch, the major reserve carbohydrate in sugar maple, is low during the active photosynthetic growth season. Starch is accumulated in the xylem ray tissues in late summer and early fall. During the cold season, there is a close relationship between starch hydrolysisaccumulation and temperature. Soluble sugars increase when starch concentrations decrease during the cold months, and these sugars may play a role in cold tolerance. Patterns of change in the stem tissues are similar to those in the root tissues but with slight differences in the timing. RCsumC: L'Crable a sucre (Acer saccharum Marsh.) affiche des patrons saisonniers de production, d'accumulation et d'utilisation des glucides non-structuraux, Ctroitement corrClCs avec des Cvhements phCnologiques et (ou) physiologiques. Les auteurs ont caractCrisC les patrons saisonniers simultane's des glucide solubles et de rCserve dans les feuilles, les rameaux, les branches et les troncs d'Crables a sucre matures et en santC. 11s ont dCterminC les teneurs en amidon et en sucres solubles (saccharose, glucose, fructose, xylose, raffinose et stachyose). La teneur en amidon, principale rCserve en glucides de 1'Crable sucre, est faible au cours de la pCriode photosynthCtique active. L'amidon s'accumule dans les t'issus des rayons du xylkme vers la fin de I' CtC dCbut de I'automne. Au cours de la saison froide, on note une Ctroite relation entre hydrolyse et accumulation, selon la tempdrature. Les sucres solubles augmentent lorsque les teneurs en amidon diminuent, pendant les mois froids, et les sucres peuvent jouer un r61e dans la tolerance au froid.Les patrons de changements dans les tissus de la tige sont semblables a ceux qui surviennent dans les tissus des racines, mais avec un lCger ddcalage dans le temps.

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Hemicellulosic Polysaccharides from the Xylopodium of Ocimum nudicaule: Changes in Composition in Dormancy and Sprouting

Cited by 5 publications

References 3 publications

Changes in pectins of the Xylopodium of Ocimum nudicaule from dormancy to sprouting

Changes in pectins of the Xylopodium of Ocimum nudicaule from dormancy to sprouting

Comparative Morphology, Anatomy, and Function of the Stem and Root of the Flowering Plants

Seasonal patterns of reserve and soluble carbohydrates in mature sugar maple (Acer saccharum)

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