Figure 6.

Expression analysis of four genes in roots of different sensitive lines of maize under nitrogen stress. In that order: The relative expression levels of genes Zm00001d004123, Zm00001d051083, Zm00001d025554, Zm00001d050798 in roots of inbred lines 116, 135, 160 and 165 under low nitrogen stress. The inbred lines 116, 135, 160 and 165 represent four different haplotypes of inbred materials, of which 116 and 135 are unfavorable haplotypes, and 160 and 165 are favorable haplotypes. Error bars in the figure represent standard errors (p < 0.05). Significant difference between groups in each nitrogen level is indicated by different letters (p < 0.05).