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Principal component analysis (PCA) score plots of metabolic profiles in alfalfa roots under the alkali stress. (A) PCA score plot for NI control (black), NI alkali-treated (blue) samples, (B) PCA score plot for RI control (red) and RI alkali-treated (yellow) samples, (C) PCA score plot for NI control (black) and RI control (red) samples, (D) PCA score plot for NI alkali-treated (blue) and RI alkali-treated (yellow) samples.
