Responses of Micropropagated Rhubarb (Rheum rhaponticum) Plantlets to Different Growing Media and Light Conditions in the Greenhouse

Cultivating red-stalked rhubarb plants is an important source of raw materials for producing health-promoting foods. The quality and quantity crops are significantly dependent on planting material. To obtain high-quality material the value selection ‘Raspberry’, we evaluated morphological physiological responses micropropagated plantlets to different growth substrates light during early ex vitro in greenhouse. were grown high-EC (GM1) low-EC (GM2) peat under four light-emitting diodes (LED) treatments as supplementary lighting (SL) wintertime: 100% red (R), blue (B), white [44.4% green (G), 24.4% B, 28.9% R; 2.2% far (FR)] R+B+G+FR (49.4/16.3/10.3/23.8%) light. Compared control (natural sunlight), applied LED increased all parameters, but only GM1 substrate. Among treatments, had most stimulative effect parameters (length leaf petioles, area, biomass) soluble sugar production. Still, it decreased levels phenolic compounds petioles. Phenolic synthesis, mainly anthocyanins, was highest (622.8 mg·100 g−1 dry mass), followed by (601.8 g−1), (464.4 (416.4 g−1). High anthocyanin accumulation R-LED associated with high antioxidant activity cessation. Hence, optimal effects related plant biosynthesis, use W-LED recommended plantlets.