Figure 8.

Drought responses of the root system in the porphyrin biosynthetic pathway. A, Metabolic enzyme activities. B, Metabolic intermediates. C, RWC of roots. Three-week-old plants were transferred from soil to half-strength Hoagland solution, hydroponically grown for 1 week, and then subjected to drought stress by air-drying treatment. Cont, Nondesiccated controls; Mild, mild drought stress under air drying for 4 h; Severe, severe drought stress under air drying for 8 h. Values are means ± se of six replicates from two independent experiments. * Significant differences between wild-type (WT) and transgenic samples as calculated by t test (P < 0.05). dw, Dry weight.