FIGURE 6.

Deficiency in P5C oxidation to Glu increases thermosensitivity. A, the effect of a continuous heat stress on root elongation of young Arabidopsis seedlings of WT and p5cdh plants. The percentage of root elongation during heat stress (38 °C) is expressed relative to nonstressed seedlings (control). The standard deviation represents an average of three repeats of 10 seedlings each. B, basal thermotolerance of WT and p5cdh seedlings to heat stress. Five-day-old seedlings were exposed to 41 °C for 2 h, and survival was estimated 2 days later. The standard deviation represents three repeats, each comprising 100 seedlings.