Figure 8.
H1.3 is required for de novo DNA methylation in response to low light/drought. A, Averaged DNA methylation levels in the CG, CHG, and CHH contexts in wild-type (WTLer) and h1.3 Arabidopsis in control and in low-light/drought conditions (stress). Asterisks indicate levels of significance: ***, P < 10−256; **, P < 10−30; and *, P < 10−10 (Student’s t test). B, Patterns of DNA methylation (in the CG, CHG, and CHH contexts) in regions that are hypermethylated in response to stress for wild-type and h1.3 plants in control and in low-light/drought conditions. Averaged methylation (within a sliding 50-bp window) was plotted for 300 bp around both the start and the end of the regions.