Distribution of nsSNPs and associated genes on maize chromosomes. Concentric circles showed aspects of the genome. Density of common nsSNPs identified in drought-tolerant maize inbreds (A) and in drought-sensitive maize inbreds (B). Genome mapping of candidate nsSNPs identified by common variants method (C). The fold change of expression level for candidate genes in ovaries (D), leaves (E) and roots (F) under water-stressed conditions compared with well-watered conditions. For Figure C, different colors indicate different strategies as shown at the bottom of right corner. For Figures D, E and F, red and green bars represent up- and down- regulated expression, respectively.