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| Lana,Luísa Gouveia; Silva,Ana Flávia de Melo; Buss,Aldineia; Oliveira,Denis Coelho de; Moreira,Ana Silvia Franco Pinheiro. |
| ABSTRACT The velamen, a root structure of some epiphytic species for water uptake, usually is stratified epidermis consisting of dead cells. In general, its cell walls exhibit variation during development, including in thickness and amount and type of impregnated substances. These changes result in diverse physical and chemical properties that can serve in water and nutrient uptake, as well as in mechanical support and protection. On this basis, the main objective of the current study was to describe the composition of the cell walls of the velamen during the development of the roots of four species of Cattleya. Anatomical, histochemical and immunocytochemical analyses were performed with samples (n=3 individuals per species) of meristematic, developing,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cattleya; Orchidaceae; Pectins; Root meristem; Velamen development. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400633 |
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| Vriesmann,Lúcia Cristina; Petkowicz,Carmen Lúcia de Oliveira; Carneiro,Paulo Irajara Borba; Costa,Maria Eugênia; Beleski-Carneiro,Eliana. |
| The aim of this work was to study the acidic polysaccharides of Psidium cattleianum. Pectic fractions were obtained by successive extractions with water, EDTA and sodium carbonate (4 and 25ºC). Monosaccharide composition, total carbohydrates, uronic acids and protein contents were determined for each fraction. The yield of water and EDTA-soluble fractions and high content of uronic acid were consistent with the presence of pectins probably arising from the middle lamellae. On the other hand, sodium carbonate-soluble pectins had a higher neutral sugar content, indicating highly branched polysaccharides in these fractions, consistent with pectins from cell wall. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pectins; Acidic polysaccharides; Psidium cattleianum; Cell wall. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000200001 |
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