Natural polysaccharides w ere exam ined for their activity as elicitors o f phytoalexins and flavonoids in alfalfa cotyledons. O nly tw o polysaccharides, lam inaran and pectic acid, had e lic­ itor activity. Laminaran, w hich was m ore active than pectic acid, was hydrolyzed by tunicase and the hydrolysate was subjected to charcoal and gel filtration colum ns. Introduction o f the pyridylam in...

IT has long been maintained that pectose, or proto-pectin as it is called by some authors, is an insoluble constituent of plant tissues, associated with cellulose in the cell-walls but exhibiting none of the properties of that substance. It has also been claimed by the majority of investigators that during the ripening of fruit, pectose decomposes into a soluble form, generally known as pectin,...

The composition, integrity, and architecture of the macromolecular matrix of cell walls, collectively referred to as cell wall ultrastructure, exhibits variation across species and organs and among cell types within organs. Indirect approaches have suggested that modifications to cell wall ultrastructure occur in response to abiotic stress; however, modifications have not been directly observed...

BACKGROUND Several evidences suggest that the position of palmitic acid (PA) in dietary triacylglycerol (TAG) influences different biological functions. We aimed at evaluating whether dietary fat with highly enriched (87%) PA in sn-2 position (Hsn-2 PA), by increasing PA incorporation into tissue phospholipids (PL), modifies fatty acid profile and biosynthesis of fatty acid-derived bioactive li...

consumption of whole-wheat breads prepared from high extraction flours is recommended because of their high content of fiber, vitamins, and minerals. despite the beneficial effects of these breads, they contain high amounts of undesirable compounds like phytic acid (pa) which is believed to negatively interfere with the absorption of some such nutrients as zinc (zn). wheat genotypes are differe...

The PAH1-encoded phosphatidate (PA) phosphatase in Saccharomyces cerevisiae is a pivotal enzyme that produces diacylglycerol for the synthesis of triacylglycerol (TAG) and simultaneously controls the level of PA used for phospholipid synthesis. Quantitative lipid analysis showed that the pah1Δ mutation caused a reduction in TAG mass and an elevation in the mass of phospholipids and free fatty a...

This study aims to characterize the pectic oligosaccharides (POSs) generated from enzymatically hydrolyzed citrus peel pectin using a selected enzyme. Pectinex Ultra AFP was used depolymerize into POSs. The POSs were analyzed high-performance liquid chromatography (HPLC) and coupled with mass spectrometer (LC/MS) methodology determine composition of monosaccharides average molar distribution ba...

Aspergillus spp. are widely spread plant pathogens. In several kinds of fruit, especially in apple and peach, aspergillus rot is one of the postharvest desease in fruit, but the infection mechanism is not known. The degradation of cell walls by pathogens is significant in primary infection and afterinfection, and plays an important role in the advancement of mycelium into the host plant and the...