Auxin sensitivity of Col-0 and <i>IAA15</i> overexpression lines.

<p>Five-day-old control (Col-0) and <i>IAA15</i> overexpression lines grown on MS medium were transferred to media containing auxin for an additional 4 days. (A) Root elongation of seedlings on 50 nM 2,4-D or IAA or NAA medium for 4 d. Data are represented as growth of primary roots relative to growth on auxin-free (MS) medium. Error bars represent the SD. A statistical analysis was performed using Student’s <i>t</i> test, with significant differences indicated relative to control (*P<0.05, **P<0.01, ***P<0.001). (B) Numbers of emerged lateral roots after 4 d of treatment. Statistical analysis was performed using Student’s <i>t</i> test. Asterisks indicate significant differences between control and transgenic lines within treatment (*P<0.05, **P<0.01, ***P<0.001).