Expression patterns of ABA-responsive genes in guard cells and leaves. (A) Expression patterns of ABA-regulated genes in guard cells. (B) Expression patterns of ABA-regulated genes in leaves. The rows of each pattern correspond to genes, and the columns correspond to conditions, i.e. four genotypes, agb1 gpa1 double mutant (db), gpa1 mutant, agb1 mutant, wild-type (wt), without or with ABA treatment.