Influence of Mineral Salts on Shoot Growth and Metabolite Biosynthesis in Tea Tree (Camellia sinensis L.)

Effects of mineral salts (N, P, K, Ca 2+ , Mg 2+ , and Fe 3+ ) on the shoot growth and metabolite production of tea tree were s tudied u sing in v itro culture techniques. Among mineral s alts, H₂PO₄? was the most important for enhanced growth rate of tea tree, while Mg 2+ and Ca 2+ did not a ffect plant growth. Remov al o f NH₄? and NO₃ from the culture medium enhanced shoot multiplication compared to other treatments. Metabolite production was variable depending on mineral types and concentration. Removal of Ca 2+ decreased the production of caffeine; however, other treatments did not influence its production. Ca 2+ , NH₄? and Fe 3+ were important factors for catechin production in tea tree. These results can be used as the basis for development of technical soil controls suitable for tea tree cultivation in the future.