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Principal component analysis of metabolome or proteome data measured in young leaf of 18 maize hybrids in the normal (20°C, red symbols) and low temperatures steps (16°C, green, 13°C, blue; 8.5°C, purple) in growth chamber. (a)–(c) PCA scores plot of 1,409 metabolites or metabolite features and starch. (d)–(f) PCA scores plot of 1,159 proteins. (a, d) PC1 × PC2 plan. (b,e) PC1 × PC3 plan. (c, f) PC2 × PC3 plan [Colour figure can be viewed at wileyonlinelibrary.com]
