Sensitivity of <i>Arabidopsis</i> wild type, BR biosynthetic mutant <i>dwf7-1</i>, and signaling mutant <i>bri1-5</i> to Pcz and Brz.

<p>(<b>A–C</b>) Seedlings of (<b>A</b>) Ws-2, (<b>B</b>) the BR biosynthetic mutant <i>dwf7-1</i> (Ws-2), and (<b>C</b>) the BR signaling mutant <i>bri1-5</i> (Ws-2) grown on ½ MS media with either 1 µM Pcz or Brz or 10 µM Brz. (<b>D–E</b>) Close-up of the shoot apices harboring cotyledons and the first pair of true leaves of (<b>D</b>) <i>dwf7-1</i> and (<b>E</b>) <i>bri1-5</i>. (<b>F–H</b>) Average root lengths of (<b>F</b>) Ws-2, (<b>G</b>) <i>dwf7-1</i> and (<b>H</b>) <i>bri1-5</i> measured at the end of treatments (<i>n</i>>10). (<b>F–H</b>) Error bars represent standard deviation and lowercase letters indicate significant differences among treatments determined by “Post-hoc” test (<i>p</i><0.05). Scale bar (<b>A–E</b>) 1 cm.