Figure 3.

Auxin response gene AXR1 is necessary for primary root length inhibition by IAA-producing strains Azospirillum Sp245 and Microbacterium RU1A. Change in primary root length after 7 days in the genetic backgrounds: (A) wild type and (B) auxin response mutant axr1-3. For box plots, horizontal lines represent the median, with the box representing the 25th and 75th percentiles, and the whiskers representing the minimum and maximum. For positive control, 1 μM IAA was used. Student’s T-test (p < 0.05) was performed (n = 18), and an asterisk indicates significant difference compared to the sterile control.