Figure 6.

Expression Analysis of ARR Gene Promoters.

ARR promoter–driven GUS constructs were generated and introduced into wild-type Columbia background. Transgenic seedlings were grown on MS media (−BA) or media supplemented with 10 nM BA (+BA) for 9 d and assayed for GUS activity. Ten transformed lines were examined, and one representative line for each construct was photographed. With the exception of ARR8:GUS, close-up images show the relative GUS activity at the primary root tip. For ARR8:GUS, the close-up images show lateral root junctions on the primary root. Scale bars = 1 mm for aerial tissues, 250 μm for roots.