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Principal component analysis (PCA) of metabolic profiles in grains of four barley genotypes under the two water treatments. (A) PCA of fraction I, organic acid; (B) PCA of fraction II, amino acids and amines; and (C) PCA of fraction III, sugars and sugar alcohols. CK, control condition with soil water content of 40%; T, water stress treatment with soil water content of 14%; Tr, Triumph; PC1, the first principal component; and PC2, the second principal component.
