Abstract
Stilbenes represent a considerable practical interest in relation to their benifits to the human health. Callus culture of the grape, which is a natural producer of stilbenes, can serve as an effective source of these compounds. Grape’s resistance to biotic environmental stress conditions is associated with the synthesis and conversion of stilbenes, therefore the aim of the current study was to determine an interrelation between the tolerance of grape varieties to downy mildew and stilbene biosynthesis in the callus culture. Obtained results showed that there was no link between variety’s tolerance to downy mildew and content of stilbenes, chalcones and phenoloxydising enzymes in callus. Presence of the stress impact is a necessary condition for the initiation of the variety-specific synthesis of stilbenes. Callus of varieties, in which stilbenes content was higher, was characterized by a lowered expression of the chalcone synthase and chalcone isomerase relative to expression of genes of the stilbene synthase and phenylalanine ammonia liase, which confirms an interrelation between reduced competition for the substrate between two biosynthesis branches of chalcones and stilbenes with production of the latter.
Highlights
IntroductionSeeds, leaves, shoots, root hairs contain flavonoids (anthocyanins, proanthocyanidins), derivatives of the stilbene – trans-resveratrol [1]
Plants are indispensable sources of many important compounds to a human health
Grape's resistance to biotic environmental stress conditions is associated with the synthesis and conversion of stilbenes, the aim of the current study was to determine an interrelation between the tolerance of grape varieties to downy mildew and stilbene biosynthesis in the callus culture
Summary
Seeds, leaves, shoots, root hairs contain flavonoids (anthocyanins, proanthocyanidins), derivatives of the stilbene – trans-resveratrol [1]. The latter has the positive therapeutic effect on human health. The final therapeutic dose of resveratrol hasn't been established yet, it's obvious that biologically active additives, which can be obtained using biotechnological approaches, can serve as its main source, [2,3,4] Biosynthesis of secondary metabolites, such as stilbenes in the grape's tissue, depends on genetic characteristics, environmental conditions and can be induced by elicitors [8,9]
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