Selected expression profiles of barley WRKY genes ( HvWRKY ) and their designate orthologs in Arabidopsis ( AtWRKY ). The signal intensities of the developmental baseline experiments by Druka et al.  and Schmid et al.  are normalized to the mean expression values and are plotted in log-scale for different homologous plant organs (1–10). The respective organs of barley and Arabidopsis are: 1 (coleoptile/cotyledon), 2 (mesocotyl/hypocotyl), 3 (radicule/seedling roots), 4 (leaf/leaf), 5 (root/root), 6 (inflorescence/inflorescence), 7 (anthers/stamen), 8 (caryopsis 5dpa/seed stage 6), 9 (caryopsis 10dpa/seed stage 8) and 10 (caryopsis 15dpa/seed stage 10).