Figure 5.

Correlation between metabolite levels and grain yield under DS (A) and HS (B) conditions. Levels of selected metabolites showing significant correlation (P < 0.001; Table IV) were plotted against grain yield under stress conditions. Ten maize hybrids were grown in two independent plots (n = 20 per year), and means of metabolite levels from six biological replicates were plotted. No metabolite showed significant correlation to grain yield under DS+HS. Circles and triangles indicate data from 2010 and 2011, respectively. Due to a minor effect of heat treatment on grain yield in 2011, only 2010 data were used for the analysis of HS. r and p are the correlation coefficient and P value from Pearson correlation analysis, respectively.