FIGURE 6.

Effect of ethephon on penetration, growth and angle of ARs in the dark. Rice stem sections including the third node were exposed to white light (WL) or kept in the dark for 3 days in the presence of different concentrations of ethephon. (A) Phenotypes of AR growth in the dark and in light (bar=1 cm). (B) Percentage of root penetration determined with Evans Blue staining. (C) Average length of AR. (D) Angle of AR growth. Bars in B–D indicate means (±SE) from nine stem sections analyzed per treatment in three independent experiments. Different letters indicate statistically significant differences (P <0.05; ANOVA with Tukey test).