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Schematic representation of nitrogen metabolism response to Mg status in tea plant. AA, amino acid; Gln, glutamine; GS1.1, cytosolic glutamine synthetase; Glu, glutamate; GS2-GOGAT, plastidic glutamine synthetase–glutamate synthase; Mg, magnesium; N, nitrogen; NH4+-N, ammonium nitrogen; NO3−, nitrate nitrogen; OG, 2-oxoglutarate; +Mg, magnesium application; −Mg, magnesium deficiency.
