Retraction: Hua, Z.-M., Yang X. & Fromm M.E. (2006). Activation of the NaCl- and drought-induced RD29A and RD29B promoters by constitutively active Arabidopsis MAPKK or MAPK proteins. Plant, Cell and Environment 29, 1761-1770. doi: 10.1111/j.1365-3040.2006.01552.x.