“…Of some 20 Aux/IAA proteins that have been tested to date, including 16 from Arabidopsis, all functioned as transcriptional repressors when expressed from effector plasmids in protoplast transfection assays (Ulmasov et al, 1997;Tiwari et al, 2001;Bargmann and Birnbaum, 2009). Consistent with the transfection results, targeted or constitutive expression of stabilized versions of IAA proteins in Arabidopsis plants resulted in suppression of auxin response genes and auxin-responsive growth and developmental responses (Fukaki et al, 2005;Kim et al, 2006;Nakamura et al, 2006;De Smet et al, 2007;Sato and Yamamoto, 2008;Ku et al, 2009;Li et al, 2009).…”