Shade avoidance in Arabidopsis requires intact cortical microtubules.

<p>(<b>A–D</b>) Arabidopsis (Col-0) plants after 24 h of white light (white bars) or green shade treatment with or without an oryzalin pre-treatment. (<b>E</b>) Petiole growth rates for Col-0 plants subjected to 24 h of control (white light; white bars) or green shade (gray bars) with or without oryzalin pre-treatment. Data points represent means ± SE (n = 10). Different letters above each bar indicate statistically significant differences (P<0.05, Tukey's <i>b</i> test).