Figure 6.

Effects of drought on metabolic activities of the porphyrin biosynthetic pathway in leaves of wild-type (WT) and transgenic plants. A, Chlorophyll and heme contents. B, Porphyrin-synthesizing enzyme activity. The plants were subjected to the same treatments as in Figure 2, and treatment notations are the same as in Figure 2. Values are means ± se of six replicates from two independent experiments. * Significant differences between wild-type and transgenic samples as calculated by t test (P < 0.05). dw, Dry weight.