Figure 2.

Distribution of the degree of fluctuations of mRNA levels of the entire sets of biosynthetic/nonallosteric (inverted triangles), biosynthetic/allosteric (triangles), and enzymes catalyzing the first catabolic step of the amino acids (circles) genes of the four metabolic networks described in Figure 1 in response to eight different abiotic stresses (both in shoots and roots). The degree of fluctuation of the mRNA levels was estimated using sd of expression (log₂ ratio of treatments versus controls), and the values in each group were sorted along the x axis. Different letters (a and b at the right of each curve) represent statistically significantly different groups (P < 3.1 × 10⁻⁵).