Fig. 1.

Identification of auxin biosynthesis genes in Arabidopsis roots. (A) Cluster analysis of the expression patterns of YUC genes in root cells. Microarray data from the public domain were clustered using methods previously described in (Birnbaum et al. (2003) and Toufighi et al. (2005). Note that YUC3, YUC5, YUC7, YUC8 and YUC9 are expressed in root cells whereas other YUC genes have low or no expression in roots. (B) Arabidopsis has 11 YUC flavin monooxygenases that can be divided into five clades (Cheng et al. 2006). The YUC genes with expression in roots form two close clades in the phylogenetic tree. (C) The patterns of GUS expression in roots of Arabidopsis transgenic plants that harbor YUC promoter::GUS constructs.