The influence of downy mildew tolerance of grape varieties on the biosynthesis of stilbenes in callus as potential sources of bioactive substances*
2020
Lutsky Eugene | Fedorovich Svyatoslav | Vyalkov Vadim | Sundyreva Maria
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.
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