Physiology and Biochemistry of Plant Cell Walls

Brett, Christopher T.; Waldron, Keith W.

doi:10.1007/978-94-010-9641-6

Cited by 382 publications

(503 citation statements)

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“…According to the same authors, the carbon necessary for the synthesis of sucrose originated from the cell wall (30 % cellulose, 30 % hemycellulose, 25 % pectin, and 5 % proteins). Other studies showed a decrease of galactose and an increase of glucose due to the degalactosylation of polysaccharide chains in apples, strawberries, tomatoes, and in germinating seeds (Ignacio et al 2011;Brett and Waldron 1996;Pressey 1983). This rapid metabolization of galactose explains why Gomez et al (2002) did not find free galactose in ripped papayas.…”

Section: Resultsmentioning

confidence: 94%

The role of hydrolases in the loss of firmness and of the changes in sugar content during the post-harvest maturation of Carica papaya L. var solo 8

et al. 2012

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Fruit ripening is associated with many hydrolase activities involved in the softening of the fruit during the maturation. This study investigates the relationship between the loss of firmness along with the changes of sugar content and the enzymatic activities in Carica papaya L.var solo 8 during post-harvest storage. Three maturation stages (green immature: the fruit is entirely green, green mature: the fruit shows 1/32 yellow skin and fully mature: the fruit shows 1/8 yellow skin) have been selected and stored at 15, 22 and 28°C. The reduction of fruit firmness, total sugar contents, refractive index (% Brix) and enzymatic activities were measured. Low enzymatic activities (0.035 μmol/min/mg) were recorded in fruit harvested at the green immature stage with no significant (p≥0.05) effect on the softening while fruit harvested at the green mature and fully mature stages showed enzymatic activities 7 times as high as those of the green immature stage. These high enzymatic activities were responsible for the loss of firmness of the fruit. Accordingly, papayas at the green mature and fully mature stages displayed higher maxima of sugar content (4.8 g/100 g at 28°C at day 12, and 10.2 g/100 g at 22°C at day 8, respectively) at higher temperatures. Meanwhile in green immature papayas, the maximum was only 4.3 g/100 g at 22°C and day 12 of storage. The results show that the loss of firmness of the papaya was highly related to the hydrolytic enzyme activities and the sweet taste to the presence of simple sugars such as galactose liberated from the polysaccharide complexes.

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Section: Resultsmentioning

confidence: 94%

The role of hydrolases in the loss of firmness and of the changes in sugar content during the post-harvest maturation of Carica papaya L. var solo 8

et al. 2012

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“…Pectin is a complex mixtures of polysaccharides composed of a galacturonic acid backbone, i.e., homogalacturonan or so-called smooth regions of which variable proportions can be methyl-esterified [11]. Pectin was also already successful tested as polymer electrolyte where the ionic conductivity of 4.7 × 10 −4 S.cm −2 was obtained [12].…”

Section: /[374] R Leones Et Almentioning

confidence: 99%

Pectin-based Polymer Electrolytes with Ir(III) Complexes

Leones

Botelho

Sentanin

et al. 2014

Molecular Crystals and Liquid Crystals

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“…As paredes primá-ria e secundária diferem química e fisicamente, ambas constituídas por polissacarídeos, glicoproteínas, água e compostos fenólicos em diferentes proporções (Braga, 1994). Os carboidratos, presentes na forma de polissacarídeos, são os componentes mais importantes da parede celular, representando 90% da mesma nos tecidos em crescimento, estando entre os mais complexos encontrados no reino vegetal (Brett & Waldron, 1983). A partir da mucilagem extraída de plantas matrizes de insulina, foi possí-vel determinar a composição química da mesma, onde foram encontrados: 6,5% de açúcar total, 1,7% de açúcar redutor, 6,7% de ácido urônico e 0,4% de proteí-nas solúveis.…”

Section: Teor De Mucilagem Na Parte Aérea De Insulinaunclassified

Nitrogênio e fósforo na produção vegetal e na indução de mucilagem em plantas de insulina

Abreu¹,

Pinto²,

Neto³

et al. 2002

Hortic. Bras.

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Foi verificada a influência da adubação com nitrogênio e fósforo na produção de biomassa e de mucilagem em plantas de Cissus sicyoides. Plantas com 45 dias, formadas pelo método de estaquia, foram plantadas em vasos com capacidade para 5 kg de solo, contendo como substrato um Cambissolo álico, textura média, do município de Nazareno-MG. Foi realizada uma adubação básica com macro e micronutrientes, variando apenas as concentrações de nitrogênio e fósforo. O experimento consistiu de 5 doses de N (0; 40; 80; 160 e 200 mg de N/kg de solo) e duas doses de P (50 e 150 mg de P/kg de solo), com 4 repetições. O delineamento foi inteiramente casualizado, em esquema fatorial de 5 x 2. O experimento foi conduzido em casa de vegetação por 90 dias, onde avaliou-se o peso de matéria seca de folha, caule e raiz; características químicas e mucilagem da parte aérea. Houve interação entre as concentrações de nitrogênio e fósforo para a produção de matéria seca foliar, sendo que os maiores ganhos de biomassa ocorreram nas maiores doses de N com 150 mg de P/kg solo. A produção de mucilagem respondeu positivamente ao aumento das concentrações de nitrogênio e fósforo, atingindo o maior conteúdo nas mesmas concentrações que proporcionaram o maior ganho de biomassa foliar e de parte aérea total.

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Physiology and Biochemistry of Plant Cell Walls

Cited by 382 publications

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The role of hydrolases in the loss of firmness and of the changes in sugar content during the post-harvest maturation of Carica papaya L. var solo 8

The role of hydrolases in the loss of firmness and of the changes in sugar content during the post-harvest maturation of Carica papaya L. var solo 8

Pectin-based Polymer Electrolytes with Ir(III) Complexes

Nitrogênio e fósforo na produção vegetal e na indução de mucilagem em plantas de insulina

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