ACCUMULATION OF LIGNIN AND PHENOLIC ACIDS IN THE CELL WALL OF CUCUMBER HYPOCOTYLS UNDER THE INFLUENCE OF PECTIN OLIGOSACCHARIDES
UDC 547.458.88
Abstract
The effectiveness of the use of citrus pectin fermentolysis products to stimulate the manifestations of phytoimmunity and resistance to abiogenic stresses has been demonstrated. It has been shown that treatment with oligosaccharides of deesterified citrus pectin (polygalacturonic acid, PGA) induces the synthesis of lignin and an increase in the content of phenolic acids in the cell walls of cucumber hypocotyls (Cucumis sativus). It was found that modification of PGK by glucosamine residues increases the activity of its fermentolysis products and leads to a 10% increase in the total content of phenolic compounds in the cell walls of cucumber hypocotyls compared with the results of processing plants with fragments of unmodified PGK. At the same time, the absolute content of the dominant phenolic components – caffeic and p-coumaric acids increases by 55% and 27%, respectively, and the spectrum of minor components of phenolic acids in the cell wall of etiolated cucumber hypocotyls also changes. The modification variant proposed in the work allows to obtain polysaccharides with a regulated content of the injected ligand. The condensation reaction with the formation of a chemically resistant amide bond makes it possible to effectively dope carbohydrate polysaccharides and their fragments, which increases the possibility of obtaining bioactive glycoconjugates for use as inducers of resistance to abiogenic stresses and diseases that localize infection during plant infection.
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