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Cell wall-bound phenolics

Maier, W., H. Peipp et al. (1995). Levels of a terpenoid glycoside (Blumenin) and cell wall-bound phenolics in some cereal mycorrhizas. Plant Physiol. 109(2) 465-470. [Pg.413]

STRACK, D., HEILEMANN, J., KLINKOTT, E.-S., Cell wall-bound phenolics from Norway spruce Picea abies) needles., Z. Naturforsch., 1988, 43c, 37-41. [Pg.26]

Codignola, A., Verotta, L., Spanu, R, Maffei, M., Scannerini, S. Bonfante-Fasolo, P. (1989). Cell wall bound-phenols in roots of vesicular-arbuscular mycorrhizal plants. New Phytologist, 112, 221-228. [Pg.193]

Lignins are complex, cell wall-bound, optically inactive phenolic heteropolymers covalently associated with both polysaccharides and proteins [102]. They are mainly localized in the impermeable water transport conduits of the xylem and other supporting tissues of all the vascular terrestrial plants, and result mainly from the oxidative... [Pg.759]

The phenylpropanoid pathway (Fig. 3.1) is responsible for the production of many natural products that are of interest in the context of plant growth and development, human health, and ecology. For example, flavonoids are necessary for pollen viability in maize and petunia, and have been suggested to play a role in directed auxin transport. Flavonoids and sinapate esters have been found to be important UV-protectants in many species, including Arabidopsis. Furthermore, wall-bound phenolics are thought to impart control over cell wall expansion, and hydroxycinnamic acids are an important structural component of the hydrophobic barrier polymer suberin. Finally, lignin is a phenylpropanoid polymer ubiquitous in higher plants, which is necessary for mechanical support and water transport. " ... [Pg.40]

Takahama, U., 1993b, Regulation of peroxidase-dependent oxidation of phenolics by ascorbic acid Different effects of ascorbic acid on the oxidation of conyferyl alcohol by the apoplastic soluble and cell wall-bound peroxidases from epicotyls of Vigna angularis, Plant Cell Physiol. 34 809-817. [Pg.82]

Bioavailability of these kind of compounds differs greatly from one polyphenol to another, so that the most abundant polyphenols in our diet are not necessarily those leading to the highest concentrations of active metabolites in target tissues. Phenolic compounds are present as free, as well as cell wall-bound compounds in plants. Most of these compounds are present as esters, glycosides, or polymers which they cannot be absorbed on their native form and they must be previously... [Pg.662]

Efficient cross-link formation by a small number of wall polymer-bound phenolics requires great precision in the metabolic reactions involved. It is not sufficient to form cross-links the cross-links need to be formed in the proper place within the polymer molecule and within the cell wall. Evidence that cross-links form at all [albeit sometimes as a low percentage of the total wall phenolics] is presented elsewhere (1,2,13,16,30-32). Here we present evidence that sufficient molecular specificity exists to be compatible with useful cross-link formation. [Pg.38]

In conclusion, it seems fair to say that specificity exists in both the biosynthesis and in the oxidative coupling of polymer-bound phenols in the growing cell wall, (a) Tyrosine residues are placed at specific sites along the extensin molecule by genetically-encoded information, (b) Tyrosine cross-linking in vivo is a very specific, carefully steered process in that it occurs... [Pg.44]

Lignin is a very complex molecule that consists of different types of phenolic monomers such as p-coumaryl, coniferyl and synapyl alcohols. It fills the spaces in the cell wall between the cellulose and the hemicelluloses matrix and is tightly bound to them via hydrogen and covalent bonds. This improves the plant s rigidity and compactness as well as its resistance against microbial attack (by restricting enzymatic access to the cellulose and hemicellulose). Lignin is amorphous with no fixed structure and therefore can only be represented by a hypothetical formula. [Pg.137]


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See also in sourсe #XX -- [ Pg.177 ]




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