Figure 8.

Blue light signaling of AR growth direction is partially impaired in the cpt1 mutant. A, A cpt1 plant, its wild-type background cv Nihonmasari, and a cv PG56 rice plant. B, A 428-bp fragment within the CPT1 gene was amplified from cv PG56 and Nihonmasari but not from cpt1. DNA was isolated from two individual plants for each genotype. C, Emerged ARs at the third node of cv Nihonmasari and cpt1. cpt1 is less sensitive to low blue light fluence rates. D, Number of ARs penetrated at the third node of stems that were exposed to increasing blue light (B) intensities for 6 d. E, Average root angles at the third node of stems that were exposed to increasing blue light intensities for 6 d or kept in white light in the presence of 150 μm ethephon (WL+E). Results in D and E are means ± se obtained from three independent experiments, with 18 stems analyzed per treatment. Different letters indicate significantly different values (P < 0.05, ANOVA with Tukey’s test).