However, it was also found in this study that with increasing Mg concentration, most of quality indexes, such as tea polyphenols, water extract, caffeine, total catechins, flavone and free amino acid showed a decreasing trend, except for theanine and soluble sugar.
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Response of characteristic hormones in tea roots and leaves under magnesium regulation and their balancing regulation on growth and quality.
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The sentences
Similarly, when different concentrations of L-tryptophan, L-phenylalanine, indole and 2-methoxycarbonylphenyl beta-D-glucopyranoside were exogenously added to the culture broth of hydroponically grown tea plants, there was also an increasing trend observed in root length, dry weight, net photosynthetic rate of tea plants and tea polyphenols, caffeine, and free amino acids (excluding theanine) contents of tea leaves.