Fig. 3From: Physiological and metabolomics analyses of young and old leaves from wild and cultivated soybean seedlings under low-nitrogen conditionsPCA of metabolic profiles and loading plots of metabolites in young and old leaves. (a) PCA of young leaves; (b) PCA of old leaves; (c) loading plot of young leaves; (d) loading plot of old leaves. C, cultivar soybean; W, wild soybean; CK, control treatment; LN, low-nitrogen stressBack to article page